Brother Wheelchair BAS 311G User Manual
SERVICE MANUAL  
BAS-311G  
BAS-326G  
Please read this manual before making any adjustments.  
DIRECT DRIVE  
PROGRAMMABLE ELECTRONIC PATTERN SEWER  
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[2] Notes on safety  
DANGER  
Wait at least 5 minutes after turning off the power switch and disconnecting the power cord from the wall outlet  
before opening the cover of the control box. Touching areas where high voltages are present can result in severe  
injury.  
CAUTION  
Environmental requirements  
Use the sewing machine in an area which is free from  
sources of strong electrical noise such as electrical  
line noise or static electric noise.  
Sources of strong electrical noise may cause  
problems with correct operation.  
The ambient temperature should be within the range  
of 5°C to 35°C during use.  
Temperatures which are lower or higher than this  
may cause problems with correct operation.  
The relative humidity should be within the range of  
45% to 85% during use, and no dew formation should  
occur in any devices.  
Excessively dry or humid environments and dew  
formation may cause problems with correct operation.  
Any fluctuations in the power supply voltage should  
be within ±10% of the rated voltage for the machine.  
Voltage fluctuations which are greater than this may  
cause problems with correct operation.  
The power supply capacity should be greater than the  
requirements for the sewing machine's power  
consumption.  
Insufficient power supply capacity may cause  
problems with correct operation.  
In the event of an electrical storm, turn off the power  
and disconnect the power cord from the wall outlet.  
Lightning may cause problems with correct operation.  
The pneumatic delivery capability should be greater  
than the requirements for the sewing machine's total  
air consumption.  
Insufficient pneumatic delivery capability may cause  
problems with correct operation.  
Installation  
Machine installation should only be carried out by a  
qualified technician.  
All cords should be secured at least 25 mm away  
from any moving parts. Furthermore, do not  
excessively bend the cords or secure them too firmly  
with staples, otherwise there is the danger that fire or  
electric shocks could occur.  
Contact your Brother dealer or a qualified electrician  
for any electrical work that may need to be done.  
The sewing machine weighs approximately 88 kg.  
The installation should be carried out by two or more  
people.  
Install the safety covers to the machine head and  
motor.  
If using a work table which has casters, the casters  
should be secured in such a way so that they cannot  
move.  
Do not connect the power cord until installation is  
complete. If the foot switch is depressed by mistake,  
the sewing machine might start operating and injury  
could result.  
Be sure to wear protective goggles and gloves when  
handling the lubricating oil and grease, so that they  
do not get into your eyes or onto your skin. If the oil  
and grease get into your eyes or onto your skin,  
inflammation can result.  
Furthermore, do not drink or eat the lubricating oil or  
grease. They may cause diarrhea or vomiting.  
Keep the oil out of the reach of children.  
Hold the machine head with both hands when tilting it  
back or returning it to its original position.  
Furthermore, do not apply excessive force when  
tilting back the machine head. The sewing machine  
may become unbalanced and fall down, and serious  
injury or damage to the sewing machine may result.  
Be sure to connect the ground. If the ground  
connection is not secure, you run a high risk of  
receiving a serious electric shock, and problems with  
correct operation may also occur.  
BAS-311G, BAS-326G  
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ii  
CAUTION  
Sewing  
This sewing machine should only be used by  
operators who have received the necessary training  
in safe use beforehand.  
If using a work table which has casters, the casters  
should be secured in such a way so that they cannot  
move.  
The sewing machine should not be used for any  
applications other than sewing.  
Attach all safety devices before using the sewing  
machine. If the machine is used without these  
devices attached, injury may result.  
Be sure to wear protective goggles when using the  
machine.  
If goggles are not worn, there is the danger that if a  
needle breaks, parts of the broken needle may enter  
your eyes and injury may result.  
Do not touch any of the moving parts or press any  
objects against the machine while sewing, as this  
may result in personal injury or damage to the  
machine.  
Turn off the power switch at the following times. If the  
foot switch is depressed by mistake, the sewing  
machine might start operating and injury could result.  
• When threading the needle  
• When replacing the bobbin and needle  
• When not using the machine and when leaving the  
machine unattended  
If an error occurs in machine operation, or if abnormal  
noises or smells are noticed, immediately turn off the  
power switch. Then contact your nearest Brother  
dealer or a qualified technician.  
If the machine develops a problem, contact your  
nearest Brother dealer or a qualified technician.  
Cleaning  
Turn off the power switch before carrying out  
cleaning. If the foot switch is depressed by mistake,  
the sewing machine might start operating and injury  
could result.  
Be sure to wear protective goggles and gloves when  
handling the lubricating oil and grease, so that they  
do not get into your eyes or onto your skin. If the oil  
and grease get into your eyes or onto your skin,  
inflammation can result.  
Furthermore, do not drink or eat the lubricating oil or  
grease. They may cause diarrhea or vomiting.  
Keep the oil out of the reach of children.  
Maintenance and inspection  
Maintenance and inspection of the sewing machine  
should only be carried out by a qualified technician.  
Hold the machine head with both hands when tilting it  
back or returning it to its original position.  
Furthermore, do not apply excessive force when  
tilting back the machine head. The sewing machine  
may become unbalanced and fall down, and serious  
injury or damage to the sewing machine may result.  
Ask your Brother dealer or a qualified electrician to  
carry out any maintenance and inspection of the  
electrical system.  
Turn off the power switch and disconnect the power  
cord before carrying out the following operations. If  
the foot switch is depressed by mistake, the sewing  
machine might start operating and injury could result.  
If the power switch needs to be left on when carrying  
out some adjustment, be extremely careful to observe  
all safety precautions.  
Use only the proper replacement parts as specified  
by Brother.  
• Inspection, adjustment and maintenance  
• Replacing consumable parts such as the rotary  
hook  
If any safety devices have been removed, be  
absolutely sure to re-install them to their original  
positions and check that they operate correctly before  
using the machine.  
Disconnect the air hoses from the air supply and wait  
for the needle on the pressure gauge to drop to “0”  
before carrying out inspection, adjustment and repair  
of any parts which use the pneumatic equipment.  
Any problems in machine operation which result from  
unauthorized modifications to the machine will not be  
covered by the warranty.  
BAS-311G, BAS-326G  
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iii  
[3] Warning labels  
The following warning labels appear on the sewing machine.  
Please follow the instructions on the labels at all times when using the machine. If the labels have been removed or are  
difficult to read, please contact your nearest Brother dealer.  
1
2
Be careful not to get your hand caught when  
tilting back the machine head and returning it to  
its original position.  
Safety devices  
Devices such as eye guard,  
3
4
finger guard, thread take-up  
cover, motor cover, tension  
release solenoid cover, inner  
cover, outer cover, fixed cover  
and gas spring support cover  
Be sure to connect the ground. If the ground  
connection is not secure, you run a high risk of  
receiving a serious electric shock, and problems  
with correct operation may also occur.  
Direction of operation  
5
Tension release  
solenoid cover  
Motor cover  
Inner cover L  
Outer cover  
Fixed cover L  
Thread take-up cover  
Motor cover L  
Inner cover R  
Outer cover  
Eye guard  
Fixed cover R  
Motor cover R  
Finger guard  
Gas spring support cover  
5222Q  
4905Q  
BAS-311G, BAS-326G  
iv  
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CONTENTS  
1. SPECIFICATIONS............................. 1  
4. MECHANICAL DESCRIPTIONS ....... 35  
4-1. Needle bar and thread take-up  
2. FUNCTION SETTINGS...................... 2  
2-1. List of special functions when power is  
mechanisms .............................................. 35  
4-2. Lower shaft and shuttle race  
turned on...................................................  
2
3
mechanisms .............................................. 35  
2-2. List of advanced functions.........................  
4-3. Work clamp lifter mechanism  
2-3. Memory switch setting method  
(Solenoid specifications) .......................... 36  
(Advanced) ..............................................  
4
5
4-4. Work clamp lifter mechanism  
2-4. List of memory switch settings ..................  
(Pneumatic specifications) ....................... 37  
2-5. Setting the work clamp mode.................... 14  
2-6. Stitch counter checking method................ 15  
2-7. Error history checking method .................. 16  
2-8. Input checking method.............................. 17  
2-9. Output checking method ........................... 20  
2-10.Software version checking method ........... 22  
4-5. Intermittent presser foot lifter  
mechanism ................................................ 37  
4-6. Intermittent presser foot stroke  
mechanism ................................................ 38  
4-7. Feed mechanism ....................................... 39  
4-8. Thread trimmer mechanism....................... 40  
4-9. Tension release mechanism...................... 41  
4-10.Thread wiper mechanism .......................... 41  
3. READING / WRITING DATA............. 23  
3-1. Handling data............................................ 23  
5. DISASSEMBLY ................................. 42  
5-1. Covers ....................................................... 42  
5-2. Thread wiper mechanism .......................... 43  
5-3. Work clamp arm mechanism ..................... 44  
3-2. Notes on handling CF cards  
(sold separately) ...................................... 24  
3-3. Structure of a CF card folder..................... 24  
3-4. Data read/write mode................................ 25  
3-5. Reading sewing data from CF cards......... 26  
3-6. Writing sewing data to CF cards ............... 27  
5-4. Intermittent presser foot lifter  
mechanism (1) ......................................... 45  
5-5. Needle bar mechanism.............................. 46  
5-6. Upper shaft mechanism............................. 47  
5-7. Lower shaft mechanism............................. 48  
5-8. Feed covers............................................... 49  
5-9. Feed mechanism ....................................... 50  
3-7. Reading memory switch data from  
CF cards.................................................... 28  
3-8. Writing memory switch data to CF cards... 28  
3-9. Reading user program data from  
CF cards.................................................... 29  
3-10.Writing user program data to CF cards ..... 29  
3-11.Updating the control program.................... 30  
3-12.Writing error log data to CF card............... 31  
3-13.Reading sewing data from floppy disks..... 31  
3-14.Writing sewing data to floppy disks ........... 32  
5-10.Work clamp lifter mechanism  
(Solenoid specifications) .......................... 53  
5-11.Work clamp lifter mechanism  
(Pneumatic specifications) ....................... 54  
5-12.Tension release mechanism...................... 55  
5-13.Intermittent presser foot lifter  
3-15.Reading extended option output data  
from a CF card .......................................... 33  
mechanism (2) ......................................... 55  
5-14.Thread trimmer mechanism....................... 56  
5-15.Shuttle hook mechanism ........................... 57  
3-16.Writing extended option output data  
to CF cards................................................ 34  
3-17.Reading extended option output data  
from floppy disks ....................................... 34  
BAS-311G, BAS-326G  
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7-10.Replacing the movable and fixed knives ... 95  
7-10-1. Installing the feed plate...................... 96  
7-11.Adjusting the thread wiper ......................... 97  
7-12.Presser foot installation position................ 97  
7-13.Changing the intermittent stroke................ 98  
7-14.Adjusting the work clamp lift amount .........100  
6. ASSEMBLY......................................... 58  
6-1. Thread trimmer mechanism (1) ............... 58  
6-2. Intermittent presser foot lifter  
mechanism (1) ......................................... 60  
6-3. Tension release mechanism ..................... 60  
6-4. Work clamp lifter mechanism  
(Solenoid specifications) ......................... 61  
7-15.Adjusting the air pressure  
(pneumatic specifications) .........................100  
6-5. Work clamp lifter mechanism  
(Pneumatic specifications) ...................... 64  
7-16.Adjusting the thread trimmer cam  
position ......................................................101  
6-6. Feed mechanism....................................... 66  
6-7. Feed covers .............................................. 73  
6-8. Upper shaft mechanism ............................ 75  
6-9. Needle bar mechanism ............................. 77  
7-17.Belt tension adjustment .............................101  
7-18.Adjusting the tension release amount........102  
7-19.Adjusting the backlash of the lower  
shaft gear...................................................103  
6-10.Intermittent presser foot lifter  
7-20.Adjusting the home position.......................104  
7-20-1. Work clamp lift home position............104  
7-20-2. X-Y feed home position .....................105  
mechanism (2) ......................................... 79  
6-11.Lower shaft mechanism ............................ 81  
6-12.Shuttle hook mechanism........................... 83  
6-13.Thread trimmer mechanism (2) ............... 83  
6-14.Work clamp arm mechanism..................... 84  
7-21.Adjusting the needle up stop home  
position ......................................................107  
7-22.Adjusting the needle up stop position........108  
6-14-1. Adjustments after work clamp arm  
installation......................................... 85  
8. ELECTRICAL MECHANISM ...............110  
8-1. Precautions while carrying out  
6-15.Thread wiper mechanism.......................... 86  
6-16.Covers....................................................... 87  
adjustments ...............................................110  
8-2. Inside the control box and operation  
7. ADJUSTMENT .................................... 88  
7-1. Checking the machine head switch........... 88  
7-2. Standard thread tension............................ 89  
7-2-1. Upper and lower thread tension........ 89  
7-2-2. Thread take-up spring....................... 90  
7-2-3. Arm thread guide R........................... 90  
7-3. Adjusting the needle bar height................. 91  
7-4. Adjusting the needle bar lift amount.......... 91  
7-5. Adjusting the driver needle guard.............. 91  
7-6. Adjusting the needle clearance................. 92  
7-7. Adjusting the shuttle race thread guide..... 92  
7-8. Rotary hook lubrication amount................. 92  
panel structure...........................................111  
8-3. Description of fuses...................................112  
8-4. Description of connectors ..........................113  
8-4-1. Connector positions...........................113  
8-4-2. Symptoms when there are poor  
connections .......................................116  
8-5. Troubleshooting.........................................119  
8-5-1. Diagnosis flowchart ...........................119  
8-5-2. Remedy .............................................123  
9. TABLE OF ERROR CODES ...............137  
10. TROUBLESHOOTING ......................141  
11. 7-SEGMENT DISPLAY .....................144  
7-9. Adjusting the position of the movable  
knife .......................................................... 93  
BAS-311G, BAS-326G  
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1. SPECIFICATIONS  
1. SPECIFICATIONS  
Sewing machine  
Stitch formation  
Lock stitch, pattern tacking sewing machine (with large shuttle hook)  
Single needle lock stitch  
2,700 rpm  
Max. sewing speed  
Sewing area (XxY)  
Feed mechanism  
Stitch length  
BAS-311G: Max. 130 x 100 mm, BAS-326G: Max. 220 x 100 mm  
Intermittent feed, pulse motor drive  
0.05 − 12.7 mm  
No. of stitches  
500,000-stitch internal memory (*)  
20,000 stitches (per program)  
Maximum no. of stitches  
No. of sewing data items  
that can be stored  
Internal memory: 512 (*), CF card: 900  
Solenoid specifications: Pulse motor drive method  
Pneumatic specifications: Pneumatic method  
Work clamp lift method  
Work clamp height  
2-step work clamp  
Solenoid specifications: Max. 25 mm, pneumatic specifications: Max. 30 mm  
Solenoid specifications: Integrated-type work clamp  
Pneumatic specifications: Separate-type work clamp  
Intermittent presser foot lift  
amount  
22 mm  
Intermittent stroke  
Rotary hook  
2 − 4.5 mm, 4.5 − 10 mm or 0 (Default setting 3 mm)  
Double-capacity shuttle hook (standard shuttle hook sold separately)  
Standard equipment  
Wiper device  
Thread trimmer  
Standard equipment  
Internal memory (Flash memory), CF card (32, 64, 128, 256 MB)  
[Option] 3.5 floppy disk 2HD/1.44MB, 2DD  
Data storage method  
User programs  
Cycle programs  
Motor  
50  
9
550 W AC servo motor  
Machine head approx. 88 kg, operation panel approx. 0.6 kg  
Control box 14.2 − 16.2 kg (Differs depending on destination)  
Weights  
Power supply  
Air pressure  
Single-phase 100 V/220 V, Three-phase 200 V/220 V/380 V/400 V 400 VA  
0.5 MPa 1.8 l/min.  
* The number of data items and stitches that can be stored will vary depending on the number of stitches in each program.  
BAS-311G, BAS-326G  
1
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2. FUNCTION SETTINGS  
2. FUNCTION SETTINGS  
2-1. List of special functions when power is turned on  
4421Q  
5056Q  
Memory switch setting mode (Standard)  
Output checking function  
1
2
3
4
5
6
7
4546Q  
4541Q  
Refer to the Instruction Manual.  
Memory switch setting mode (Advanced)  
Refer to “2-9. Output checking method”.  
Software version display function  
4547Q  
4542Q  
Refer to “2-3. Memory Switch Setting Method (Advanced)”.  
Data initialization function  
Refer to “2-10. Software version checking method”.  
Feed plate installation mode  
8
4543Q  
5057Q  
Refer to the Instruction Manual.  
Error log display function  
Refer to “7-10-1. Installing the feed plate”.  
Home position adjustment mode  
9
4548Q  
4544Q  
Refer to “2-7. Error history checking method”.  
Input checking function  
Refer to “7-20. Adjusting the home position”.  
Needle up stop position adjustment mode  
10  
4545Q  
4549Q  
Refer to “7-22. Adjusting the needle up stop position”.  
Refer to “2-8. Input checking method”.  
BAS-311G, BAS-326G  
2
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2. FUNCTION SETTINGS  
2-2. List of advanced functions  
While holding down the TEST key, press the corresponding combination key.  
4550Q  
Memory switch setting mode (Standard)  
User program setting mode  
1
2
3
4
5
6
7
8
4489Q  
4493Q  
Refer to the Instruction Manual.  
Lower thread counter setting mode  
Refer to the Instruction Manual.  
Parallel movement mode  
4551Q  
4490Q  
Refer to the Instruction Manual.  
Refer to the Instruction Manual.  
Production counter setting mode  
Stitch counter checking mode  
4491Q  
4552Q  
Refer to the Instruction Manual.  
Production counter temporary display function  
When SPEED indicator is illuminated  
Refer to “2-6. Stitch counter checking method”.  
CF data read/write mode  
4553Q  
4492Q  
Refer to “3-4. Data read/write mode”.  
Refer to the Instruction Manual.  
BAS-311G, BAS-326G  
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3
2. FUNCTION SETTINGS  
2-3. Memory switch setting method (Advanced)  
While pressing the TEST key and the SELECT key, turn  
on the power switch.  
* Keep pressing the TEST key and the SELECT key until  
the model name is displayed and the buzzer beeps  
once.  
1
All indicators switch off  
• The memory switch number will be displayed in the  
PROGRAM No. display and the setting value for that  
number will be displayed in the menu display.  
Menu indicator switches off  
TEST indicator illuminates  
4449Q 4421Q  
Press the  
number.  
or  
key to select the memory switch  
key to change the setting value.  
2
Press the  
or  
4554Q  
If you would like to display only the numbers of While pressing the SELECT key, press the  
or  
key.  
memory switches that have been changed from  
default settings  
• The numbers of memory switches that have been  
changed from default settings will appear in order.  
• If no memory switches have been changed from their  
default settings, the display will not change and the  
buzzer will beep twice.  
4555Q  
Ending setting mode  
Press the TEST key.  
3
• The changes will be memorized and the sewing  
machine will switch to home position detection  
standby.  
TEST indicator switches off  
• If you would like to return the setting for a single memory switch to the default setting, press the  
RESET key while the number for that memory switch is displayed.  
• To return the settings for all memory switches to the default settings, keep pressing the RESET key  
for two or more seconds until the buzzer makes a long beep.  
BAS-311G, BAS-326G  
4
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2. FUNCTION SETTINGS  
2-4. List of memory switch settings  
Setting  
range  
No.  
Setting items  
Initial value  
ON  
Work clamp lift timing after sewing is completed  
001  
002  
OFF  
ON  
Lifts at the final stitch position.  
Lifts after moving to the home position.  
Separate-type work clamp drop operation (pneumatic specifications)  
0
1
2
Left and right work clamp drop at the same time.  
Work clamp drops in the order left → right.  
Work clamp drops in the order right → left.  
0
Work clamp drop operation (solenoid specifications)  
Analog dropping: Work clamp drops in direct proportion to the pedal depression  
amount, and sewing starts when the pedal is fully depressed  
1st step drop: Work clamp drops when pedal is depressed to the 1st step, and  
sewing starts when pedal is depressed to the 2nd step  
0
1
003  
100  
2
2nd step drop: Work clamp drops to intermediate height when the pedal is  
depressed to the 1st step, and work clamp drops and sewing starts when the  
pedal is depressed to the 2nd step.  
2
Sewing start speed  
The sewing speed for the first 1 − 5 stitches is set by memory switch numbers 151  
− 155.  
1st stitch at 400 rpm, 2nd stitch at 400 rpm, 3rd stitch at 600 rpm, 4th stitch at 900  
rpm, 5th stitch at 2,000 rpm  
OFF  
ON  
OFF  
Single-stitch test feed  
Test feed starts when the foot switch (start switch) is depressed, and it continues  
automatically until the final stitch.  
OFF  
Test feed is carried out one stitch at a time when the foot switch (start switch) is  
depressed (feed becomes continuous if the foot switch [start switch] is  
continuously depressed).  
200  
OFF  
ON  
In addition, when the TEST indicator is illuminated, test feeding will move forward  
one stitch at a time when the machine pulley is turned by hand.  
Production counter display  
300  
400  
401  
402  
OFF  
OFF  
OFF  
OFF  
OFF  
ON  
User programs  
OFF  
Lower thread counter display  
Production counter display  
Disabled  
User program mode is enabled.  
ON  
Cycle programs  
OFF  
ON  
Disabled  
When sewing user programs, the set programs are sewn in numeric order.  
Maximum reduction ratio (mm display) (*1)  
OFF  
ON  
Displayed as %.  
Displayed as mm.  
Split mode selection  
0
1
2
Continuous split (split menu is disabled before split detection)  
Continuous split (split menu is always enabled)  
Independent split  
403  
0
*1 The mm display may differ slightly from the actual sewing size.  
BAS-311G, BAS-326G  
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5
2. FUNCTION SETTINGS  
Work clamp settings  
Setting  
range  
No.  
Setting items  
Initial value  
Work clamp operating mode (*2)  
1
(Standard single pedal) Work clamp rises automatically.  
(Single pedal with no automatic work clamp lifter)  
Work clamp rises in accordance with foot switch depression amount.  
2
(Standard 2 pedal)  
Work clamp rises automatically, and drops in accordance with work clamp switch  
depression amount  
* The left and right order can be changed using memory switch No. 002.  
3
4
5
(2 pedal with no automatic work clamp lifter)  
Work clamp lifts while work clamp switch is being depressed.  
(Left/right work clamp → Intermittent presser foot 2-step work clamp)  
When the work clamp switch is depressed to the 1st step, both the left and right  
work clamps drop, and when it is depressed to the 2nd step, the intermittent  
presser foot drops. (Lifting is in the same order.)  
(Left and right alternating 2-step work clamp)  
Two-step operation, with left and right order switching for each item sewn.  
Starts from right → left  
(Forward/reverse pedal)  
When the start switch is depressed, the work clamp drops and the sewing  
machine starts in that order with forward control, and when the work clamp switch  
is depressed, the sewing machine reverses and the work clamp lifts.  
* The left and right order can be changed using memory switch No. 002.  
(2-step work clamp using two presses)  
6
7
For solenoid specifications (1 pedal)  
When the foot switch is depressed, the work clamp stops in the intermediate  
position → work clamp drops → sewing machine starts in that order, and the work  
clamp lifts when the foot switch is depressed backward.  
* The work clamp does not stop in the intermediate position if memory switch No.  
003 is set to “1”.  
050  
*3  
8
For pneumatic specifications (2 pedal)  
When the work clamp switch is depressed, the left work clamp drops → right work  
clamp drops → both work clamps lift in that order.  
* The left and right order can be changed using memory switch No. 002.  
(Standard 3 pedal)  
For solenoid specifications  
The left pedal lowers the work clamp in the intermediate position, the right pedal  
(center) lowers the work clamp, and the start pedal (right) starts the sewing  
machine.  
9
* The work clamp does not stop in the intermediate position if memory switch No.  
003 is set to “1”.  
For pneumatic specifications  
The left pedal raises and lowers the left work clamp, and the right pedal (center)  
raises and lowers the right work clamp.  
The start pedal (right) starts the sewing machine.  
(Triple pedal with independent home detection)  
The right pedal (center) is used exclusively for detecting the home position.  
The left pedal raises and lowers the left and right work clamps, and the start pedal  
(right) starts the sewing machine.  
(Special triple pedal with independent home detection)  
The right pedal (center) is used exclusively for detecting the home position.  
The left pedal raises and lowers the left work clamp, and the start pedal (right)  
lowers the right work clamp and starts the sewing machine.  
10  
11  
*2 Allowable setting values by specification  
Pedal specifications  
1 pedal  
Solenoid specifications  
Pneumatic specifications  
1, 2  
1, 2, 8  
3, 4  
9
2 pedal  
3 pedal  
3, 4, 5, 6, 7, 8  
9, 10, 11  
*3 Solenoid specifications: 1, Pneumatic specifications: 3  
BAS-311G, BAS-326G  
6
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2. FUNCTION SETTINGS  
Setting  
range  
No.  
051  
Setting items  
Initial value  
ON  
Work clamp operation before home position detection  
OFF  
ON  
Work clamp cannot be raised or lowered before home position is detected  
Work clamp can be raised and lowered before home position is detected  
Work clamp operation during split programs  
OFF  
Work clamp lifts automatically when sewing pauses due to a split program  
Work clamp lifts when the foot switch is depressed when sewing pauses due to a  
split program  
052  
053  
OFF  
ON  
Time from intermittent presser foot lifting until feed mechanism starts moving  
Units (mS)  
Intermittent presser foot drop timing  
100  
0
0 − 999  
Presser foot drops when the work clamp switch is depressed, but it does not drop  
at the feed retract position.  
Presser foot drops when the work clamp switch is depressed.  
Presser foot drops at the sewing start, regardless of the work clamp switch  
operation.  
0
1
2
054  
055  
Work clamp signal valve special output for pneumatic-type work clamp (pneumatic specifications)  
0
Disabled  
Valve output is reversed for pneumatic specifications  
(Connect the air tubes in reverse so that the work clamp can lift when the power is  
turned off.)  
1
0
Reverse valve output is output simultaneously for 2-position valve specifications.  
(Right work clamp reverse = Option output No. 4, Left work clamp reverse =  
Option output No. 5)  
2
Thread winding operation before home position is detected  
056  
057  
OFF  
ON  
OFF  
ON  
Thread winding cannot be carried out before home position is detected.  
Thread winding can be carried out before home position is detected.  
Work clamp operation when feed moves to sewing start position after home position is detected  
Work clamp stays dropped after home position is detected  
OFF  
Work clamp lifts when pedal is depressed backward (for single pedal) or when  
work clamp switch is depressed (for 2 pedals)  
Work clamp lifts automatically after home position is detected.  
* Disabled when memory switch No. 050 = 2 or 4.  
ON  
Work clamp operation at sewing end  
Work clamp lifts automatically at the sewing end  
* Disabled when memory switch No. 050 = 2 or 4.  
Work clamp does not lift automatically at the sewing end  
058  
OFF  
OFF  
ON  
BAS-311G, BAS-326G  
7
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2. FUNCTION SETTINGS  
Sewing machine motor settings  
Setting  
range  
No.  
Setting items  
Initial value  
OFF  
Highest needle position stop  
OFF  
Disabled  
When the upper shaft stops, the motor operates in reverse to return the needle bar  
close to its highest position.  
(When the motor operates in reverse to raise the needle, the thread take-up will  
stop at a position which is lower than its normal stopping position. As a result, the  
thread take-up will rise slightly at the sewing start, and this may result in the thread  
pulling out under certain conditions.)  
150  
ON  
1st stitch sewing speed at the sewing start  
(Units x100 rpm)  
2nd stitch sewing speed at the sewing start  
(Units x100 rpm)  
3rd stitch sewing speed at the sewing start  
(Units x100 rpm)  
4th stitch sewing speed at the sewing start  
(Units x100 rpm)  
5th stitch sewing speed at the sewing start  
(Units x100 rpm)  
5th last stitch sewing speed at the sewing end  
(Units x100 rpm)  
4th last stitch sewing speed at the sewing end  
(Units x100 rpm)  
3rd last stitch sewing speed at the sewing end  
(Units x100 rpm)  
2nd last stitch sewing speed at the sewing end  
(Units x100 rpm)  
Piercing force boosting operation  
151  
152  
153  
154  
155  
156  
157  
158  
159  
4
4 − 27  
4 − 27  
4 − 27  
4 − 27  
4 − 27  
4 − 27  
4 − 27  
4 − 27  
4 − 20  
8
12  
27  
27  
27  
27  
27  
12  
OFF  
Disabled  
161  
162  
OFF  
OFF  
Piercing force boosting operations are carried out when the sewing machine motor  
is locked  
ON  
Regulation of sewing speed changes due to sewing pitch changes  
OFF  
Sewing speed varies depending on sewing pitch of the sewing data  
Speed is fixed at the minimum sewing speed for the maximum pitch of the sewing  
data  
(Set to ON if there may be a problem with sewing speed changes as a result of  
pitch changes.)  
ON  
Limits the maximum sewing speed.  
(Units x100 rpm)  
Thread trimming disabled  
163  
164  
27  
12 − 27  
OFF  
OFF  
ON  
Thread trimming is carried out in accordance with the sewing data.  
All thread trimming operations are disabled.  
Highest needle position stop angle (Units 2 degree steps) (*4)  
165  
0
0: Normal needle up position: Needle bar height increases for values in the  
negative direction.  
-15 − 0  
*4 If the setting value becomes to large in the negative direction, error “E110” may be generated at the first sewing start  
after the power is turned on.  
BAS-311G, BAS-326G  
8
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2. FUNCTION SETTINGS  
Feed settings  
Setting  
range  
Mechanism home position return when sewing is finished  
No.  
Setting items  
Initial value  
OFF  
OFF  
When sewing is finished, the feed plate returns to the start position.  
When sewing is finished, the feed plate moves via the machine home position to  
250  
ON  
the start position.  
Feed speed  
1
2
3
4
5
100 mm/s Slow  
200 mm/s  
300 mm/s  
400 mm/s  
500 mm/s Fast  
251  
3
High-speed test feeding  
Feeding is normally slow, and becomes faster when the foot switch is depressed  
OFF  
to the 1st step  
252  
253  
OFF  
OFF  
(For 2 pedals, it becomes faster when the work clamp switch is depressed.)  
Test feeding is at the same speed as sewing.  
* This does not apply to checking stitch by stitch.  
ON  
Home position detection method  
OFF  
Depress the foot switch (start switch) while the PROGRAM No. display is flashing.  
Press the special external input switch (EXIN3) while the PROGRAM No. display  
is flashing. (Foot switch/start switch are disabled.)  
ON  
Movement path from mechanism home position to start position  
Moves to the start position simultaneously for X and Y, in the order of in front of Y  
→ middle of X.  
0
Moves to start position in the order of X start point → Y start point in the order of in  
front of Y → middle of X.  
1
254  
0
Moves to start position in the order of right edge of X → Y start point → X start  
point in the order of right edge of X → in front of Y.  
2
Moves to start position in the order of left edge of X → Y start point → X start point  
in the order of left edge of X → in front of Y.  
3
Changes the overall feed timing  
260  
261  
262  
263  
264  
265  
266  
0
0
0
0
0
0
0
-10 − 10  
Changes the feed timing for the 1st stitch at the sewing start  
-10 − 10 -10: Early ← 0: Standard → 10: Late  
Changes the feed timing for the 2nd stitch at the sewing start  
-10 − 10 -10: Early ← 0: Standard → 10: Late  
Changes the feed timing for the 3rd stitch at the sewing start  
-10 − 10 -10: Early ← 0: Standard → 10: Late  
Changes the feed timing for the 3rd stitch before the sewing end  
-10 − 10 -10: Early ← 0: Standard → 10: Late  
Changes the feed timing for the 2nd stitch before the sewing end  
-10 − 10 -10: Early ← 0: Standard → 10: Late  
Changes the feed timing for the 1st stitch before the sewing end  
-10 − 10 -10: Early ← 0: Standard → 10: Late  
-10: Early ← 0: Standard → 10: Late  
If the overall feed timing (setting for No. 260) is changed from the default value, specify the  
number of applicable stitches.  
267  
0
0
No limit  
The feed timing returns to the standard feed timing once the specified number of  
stitches has been sewn.  
1 − 99  
Changes feed timing standard  
0
[Feed start reference] Makes the timing uniform at the start of feed.  
[Needle up reference] Changes the timing at the start of feed so that the needle  
zigzagging is even.  
[Feed end reference] Makes the timing uniform at the end of feed.  
[Linked to speed] Feed timing is uniform even if the sewing speed changes.  
268  
269  
1
0
1
2
3
Adjusts the feed motor output  
-5 − 5 -5: Low← 0: Standard → 5: High  
BAS-311G, BAS-326G  
9
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2. FUNCTION SETTINGS  
Operation panel settings  
Setting  
range  
No.  
Setting items  
Initial value  
Operation panel changing limitation  
0
No limits on changing setting values using the operation panel.  
Program numbers, XY scale, sewing speed, lower thread counter, work clamp  
height, intermittent height and digital tension values cannot be changed.  
Program numbers, XY scale, sewing speed, work clamp height, intermittent height  
and digital tension values cannot be changed.  
1
2
350  
0
3
4
5
6
7
Program numbers cannot be changed.  
Program numbers and XY scale settings cannot be changed.  
Program numbers, XY scale and sewing speed settings cannot be changed.  
XY scale settings cannot be enlarged. (They can be reduced.)  
Sewing speed setting cannot be changed.  
Changing memory switches  
351  
352  
353  
OFF  
0
OFF  
ON  
Allowed  
Forbidden  
Counting method for lower thread counter and production counter  
0
1
2
Counted for each item of sewing data  
Counted for each thread trimming operation.  
Counted when sewing data ends or when split stops  
Counter timing for lower thread counter  
OFF  
OFF  
ON  
Counted at the end of sewing.  
Counted at the start of sewing.  
Switching program numbers using an external switch  
0
Disabled  
354  
355  
0
Program number is switched by means of the 5 bits of option input (EXIN6 −  
EXIN10).  
Applicable numbers are: Setting number = 3rd digit, last two digits can be 1 − 31.  
1 − 9  
Switches split numbers using an external switch  
OFF  
Disabled  
OFF  
Split number is switched by means of the 5 bits of option input (EXIN6 − EXIN10).  
Applicable numbers are 1 − 31 (only enabled for independent split mode)  
ON  
User program settings  
Setting  
range  
No.  
Setting items  
Initial value  
OFF  
Moving to start point when switching user programs  
OFF  
Feed moves to the start point after starting and switching.  
Feed moves to the next sewing start point at the same time as the user program  
switches.  
450  
ON  
Limitations on changing settings for user programs  
452  
OFF  
OFF  
ON  
No limit  
User program contents cannot be changed.  
BAS-311G, BAS-326G  
10  
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2. FUNCTION SETTINGS  
Data editing settings  
Setting  
range  
No.  
Setting items  
Initial value  
Sewing area limit in X direction [Units mm]  
460  
461  
BAS-311G setting value  
BAS-326G setting value  
Sewing area limit in Y direction  
[Units mm]  
Enlargement/reduction reference point  
130  
220  
0 − 130  
0 − 220  
100  
0
0 − 100  
0
1
2
Center of sewing frame  
Sewing start point  
Center of pattern  
462  
463  
464  
Enlargement/reduction for bar tacking  
OFF  
OFF  
OFF  
ON  
Bar tacking stitches (pitch approx. 1 mm or less) cannot be enlarged or reduced.  
Bar tacking stitches (pitch approx. 1 mm or less) are also enlarged or reduced.  
Enlargement/reduction ratio in XY directions  
OFF  
Disabled  
Enlargement/reduction ratio setting is the same for X and Y  
(Disabled for user programs)  
ON  
Storing parallel movement amount for sewing pattern  
Initialized when program number or enlargement/reduction ratio is changed and  
when power is turned off.  
Initialized when program number or enlargement/reduction ratio is changed but not  
when power is turned off.  
OFF  
ON  
465  
466  
OFF  
Reading sewing data from eternal media into internal memory  
0
[Normal mode] Programs are copied one by one into internal memory.  
[Overwrite mode] Sewing data is overwritten into the temporary buffer area.  
If sewing data with the same program number already exists in internal memory, it  
is deleted.  
1
0
[Assignment mode] Sewing data is overwritten into the temporary buffer area.  
If sewing data with the same program number already exists in internal memory, it  
is not deleted, but only the data in the temporary buffer is used.  
(If sewing data with the same program number already exists in internal memory  
and the setting is changed to “0” or “1”, the data in the temporary buffer will be  
cleared.)  
2
Changing gear ratio correction method when reading from a 2DD floppy disk.  
Automatic conversion as specified by sewing machine model.  
(For the BAS-311G, data is read as BAS-311A data and then converted.)  
0
467  
468  
0
1
2
3
BAS-311A data is read.  
BAS-326A data is read.  
BAS-341A/BAS-342A data is read.  
Retract point switching at parallel movement point  
OFF  
OFF  
ON  
Disabled  
The position moved to by parallel movement is recorded as the retract point.  
Device settings  
Setting  
range  
Needle cooler device  
No.  
Setting items  
Initial value  
OFF  
550  
OFF  
ON  
Disabled  
Needle cooler device is used. (Option output No. 12)  
Tension release setting at the sewing start  
551  
OFF  
OFF  
ON  
Disabled  
Enabled  
Tension release timing during thread trimming [Units 8 degree steps]  
-10 − 1 -10: Early ← 0: Standard → 1: Late  
Thread nipping timing (*5)  
1 − 4 1: Early ← 2: Standard → 4: Late  
552  
553  
0
2
*5 Not used for the BAS-311G and BAS-326G.  
BAS-311G, BAS-326G  
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11  
2. FUNCTION SETTINGS  
Setting  
range  
Thread breakage detector  
No.  
Setting items  
Initial value  
OFF  
554  
555  
OFF  
ON  
Disabled  
Fiber-type thread breakage detector used  
Thread breakage detector detection sensitivity  
OFF  
OFF  
ON  
5 stitches at sewing start, 3 stitches while sewing  
10 stitches at sewing start, 3 stitches while sewing  
Inner clamping device (Option output No. 13)  
0
1
2
3
Disabled  
Inner clamping device is used.  
(Retract operation is carried out at the sewing end to prevent interference with the  
needle.)  
Inner clamping device is used. (No retract operation at the sewing end.)  
Inner clamping device operates for 1/4 of the sewing pattern and returns for the  
other 3/4.  
556  
0
(No retract operation)  
External wiper device  
0
1
2
Disabled  
557  
558  
1
Solenoid-type wiper device is used.  
Pneumatic-type wiper device is used. (Option output No. 2)  
External error monitoring input  
OFF  
OFF  
ON  
Disabled  
Enabled (P10, option input No. 13 [AIRSW])  
Operating indicator output  
OFF  
Disabled  
559  
560  
OFF  
Option output No. 9: Output ON while operating  
Option output No. 10: ON during lower thread conversion and during test mode  
Option output No. 11: ON when error is generated  
ON  
Automatic ejector (Option output No. 3 output, option input No. 1 = right sensor, input No. 2 = left  
sensor) [Pneumatic specifications]  
0
1
2
3
Disabled  
Standard operation  
Sewing starts when cassette sensor is ON  
Start switch is enabled even if cassette sensor is OFF.  
0
Timer from sensor detection to sewing start when automatic ejector automatic starting is set  
(memory switch No. 560 = 2) [Pneumatic specifications]  
561  
562  
563  
100  
ON  
Time from after the cassette is chucked until automatic starting  
Changes the digital tension setting value.  
0 − 999  
OFF  
Tension number can be changed regardless of the sewing data.  
Only tension No. 0 and the tension numbers detected in the sewing data can be  
changed.  
ON  
2-step tension is possible (When using spring-type main tension)  
OFF  
OFF  
ON  
Disabled  
2-step tension is used.  
Increases maximum tension release force when using a spring-type main tension  
0
Disabled (Tension release is open at the sewing end.)  
Increases the force (Tension release is closed at the sewing end. If tension release  
is open, it will be closed in approximately 5 minutes.)  
564  
0
1
Increases force to the maximum. (Tension release is closed at the sewing end. If  
tension release is open, it will be closed in approximately 1 minute.)  
2
Thread nipper device (*6)  
OFF  
Disabled  
565  
OFF  
Thread nipper device installed (Memory switch No. 500 must also be set to ON or  
OFF.)  
ON  
*6 Not used for the BAS-311G and BAS-326G.  
BAS-311G, BAS-326G  
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12  
2. FUNCTION SETTINGS  
Error processing settings  
Setting  
range  
No.  
Setting items  
Initial value  
0
Error release method when operation has stopped  
0
1
2
Press the RESET key.  
650  
651  
Press the RESET key or the STOP switch.  
Press the RESET key or input a signal from the external switch (EXIN3).  
Needle stop position when sewing is interrupted by the STOP switch  
0
1
2
Needle stops in the down position.  
Needle stops in the up position.  
0
Needle stops in the up position after thread trimming.  
Thread trimming operation when sewing is paused  
652  
653  
655  
OFF  
OFF  
OFF  
OFF  
ON  
Thread trimming is carried out when the pause is canceled.  
Thread trimming is not carried out when the pause is canceled.  
Resuming sewing after sewing is paused  
OFF  
ON  
STOP switch → RESET key →  
key → Sewing starts  
STOP switch → RESET key → Sewing starts  
Disables the needle up stop position monitoring sensor  
OFF  
ON  
Sensor is enabled and needle up stop position errors [E110] are detected.  
Disabled  
Home position return when sewing is paused  
OFF  
Mechanism moves to home position and then moves to sewing start position.  
Mechanism steps back to the sewing start position along the sewing path without  
moving to the home position.  
656  
OFF  
ON  
Maintenance settings  
Setting  
range  
No.  
Setting items  
Initial value  
Run-in operation mode  
0
Disabled  
While the foot switch is being depressed, the work clamp moves up and down  
once and then continuous operation starts.  
1
(Work clamp does not move up or down if memory switch No. 050 = 2 or 4)  
While the foot switch is being depressed, the work clamp moves up and down  
twice and then continuous operation starts.  
750  
0
2
(Work clamp does not move up or down if memory switch No. 050 = 2 or 4)  
While the foot switch is being depressed, the work clamp moves up and down  
three times and then continuous operation starts.  
3
(Work clamp does not move up or down if memory switch No. 050 = 2 or 4)  
Run-in operation cycle time adjustment timer  
751  
752  
20  
00  
Units [x10 ms]  
0 − 255  
Sewing machine ID code  
Sewing data specified on CF card  
00 − 99  
Reading/writing sewing data for old models  
755  
756  
OFF  
OFF  
OFF  
ON  
Only compatible with floppy disks.  
Reading and writing using CF cards is possible in data read/write mode.  
Main shaft angle display mode  
OFF  
ON  
Disabled  
Main shaft angle is displayed when sewing machine starts.  
Specifications and destination settings  
Setting  
range  
No.  
Setting items  
Initial value  
Specification code setting  
(This memory switch does not return to the initial value when all settings are reset.)  
Specifications at the time of shipment from the factory  
(Specifications shown on the model plate on the machine head)  
0
850  
0
1
2
3
Heavy-weight material specifications  
Medium-weight material specifications  
Extra heavy-weight material specifications  
BAS-311G, BAS-326G  
13  
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2. FUNCTION SETTINGS  
Unique machine settings  
Setting  
range  
No.  
Setting items  
Initial value  
OFF  
Automatic start for extended option output No. 1  
950  
951  
OFF  
ON  
Disabled  
Sewing machine starts when extended option output No. 1 is ON.  
Program number output  
OFF  
Disabled  
OFF  
When the last two digits of the program number are 1 to 15, the program number  
is output in 4 bits to extended option output 4 − 7.  
ON  
2-5. Setting the work clamp mode  
Combinations of memory switch settings can be used to switch the work clamp operating mode to any one of the following  
modes.  
<Solenoid specifications, single pedal standard operations>  
Operating mode  
Memory switch setting  
Automatic work  
clamp lifting  
Drop operation  
Analog drop  
After home position detection  
After sewing start  
003  
050  
057  
058  
Automatic lift  
Dropped  
0
0
0
0
0
1
1
1
1
1
2
2
2
2
2
1
1
1
1
2
1
1
1
1
2
1
1
1
1
2
ON  
ON  
OFF OFF  
OFF  
−
ON  
ON  
OFF OFF  
OFF  
−
ON  
ON  
OFF OFF  
OFF  
−
OFF  
ON  
Automatic lift  
Yes  
No  
Automatic lift  
Dropped (*)  
Dropped (*)  
Automatic lift  
Dropped  
Automatic lift  
Dropped (*)  
Dropped (*)  
Automatic lift  
Dropped  
Dropped (*)  
Dropped (*)  
Automatic lift  
ON  
−
OFF  
ON  
Yes  
No  
1st step drop  
2nd step drop  
Dropped (*)  
Dropped (*)  
Automatic lift  
ON  
−
OFF  
ON  
Yes  
No  
Automatic lift  
Dropped (*)  
Dropped (*)  
Dropped (*)  
Dropped (*)  
ON  
−
(*) If memory switch No. 057 is OFF, the work clamp will lift when the pedal is depressed backward.  
<Solenoid specifications, single pedal sequence operation>  
Operating mode  
Memory switch setting  
Automatic work  
clamp lifting  
Drop operation  
1st step drop  
After home position detection  
After sewing start  
003  
050  
057  
058  
Automatic lift  
Dropped (*)  
Automatic lift  
Dropped (*)  
Automatic lift  
Dropped (*)  
Automatic lift  
Dropped (*)  
1
1
1
1
2
2
2
2
8
8
8
8
8
8
8
8
ON  
ON  
OFF OFF  
OFF  
ON  
ON  
OFF  
ON  
Automatic lift  
Dropped (*)  
Automatic lift  
Dropped (*)  
Yes  
Yes  
ON  
OFF  
ON  
2nd step drop  
OFF OFF  
OFF ON  
(*) Work clamp lifts when pedal is depressed backward.  
BAS-311G, BAS-326G  
14  
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2. FUNCTION SETTINGS  
<Pneumatic specifications, 2 pedal standard operations>  
Operating mode  
Memory switch setting  
002 050  
clamp  
After home position  
Work clamp operation  
After sewing start  
057  
058  
detection  
Work  
drop  
Automatic lift  
Dropped  
3
3
3
3
ON  
ON  
OFF  
ON  
Automatic lift  
sequence selection  
0: Left and right  
simultaneously  
1: Left → Right  
2: Right → Left  
Work clamp lifts automatically  
and drops when the work  
clamp switch is depressed.  
Automatic lift  
Dropped  
OFF OFF  
Dropped  
Dropped  
OFF  
ON  
Work clamp rises while work  
clamp switch is depressed  
Dropped  
4
−
−
−
Work clamp switch  
1st step: Both left and right  
work clamps drop  
2nd step: Intermittent presser  
foot drops  
Lifting is simultaneous  
Automatic lift  
Dropped  
5
5
5
5
6
6
6
6
ON  
ON  
OFF  
ON  
Automatic lift  
Dropped  
−
Automatic lift  
Dropped  
OFF OFF  
OFF  
ON  
ON  
OFF  
ON  
Automatic lift  
Dropped  
Work clamp drop sequence at  
work clamp switch 1st and  
2nd steps alternates each  
time an article is sewn.  
Automatic lift  
Dropped  
ON  
−
Automatic lift  
Dropped  
OFF OFF  
Initially right → left  
OFF  
ON  
<Pneumatic specifications, 2 pedal sequence operation>  
Operating mode  
Memory switch setting  
After home position  
Work clamp operation  
After sewing start  
002  
050  
057  
058  
detection  
Work  
clamp  
drop  
Automatic lift  
Dropped  
7
7
7
7
5
5
5
5
ON  
ON  
OFF  
ON  
When start switch  
depressed, work clamp drops  
→ sewing starts  
Lifts in reverse order using  
work clamp switch  
is  
Automatic lift  
sequence selection  
0: Left and right  
simultaneously  
1: Left → Right  
2: Right → Left  
Automatic lift  
Dropped  
OFF  
OFF  
ON  
OFF  
ON  
Dropped  
Automatic lift  
Dropped  
Work  
clamp  
drop  
Automatic lift  
Dropped  
OFF  
ON  
sequence selection  
0: Left and right  
simultaneously  
1: Left → Right  
2: Right → Left  
Work clamp switch  
ON  
Left (right) work clamp  
Right (left) work clamp  
Both work clamps lift  
→
→
Automatic lift  
Dropped  
OFF  
OFF  
OFF  
ON  
2-6. Stitch counter checking method  
1. While holding down the TEST key (1), press the  
(2).  
key  
“Cnt” will be displayed in the PROGRAM No. display (3),  
and the cumulative number of stitches will be displayed  
in the menu display (4) in units of 100,000 stitches.  
(While the  
key (5) is being pressed, the cumulative  
number of stitches will be displayed in units of 100  
stitches in all 7 digits of the PROGRAM No. display and  
the menu display (4).)  
2. When the TEST key (1) is pressed, the display will  
return to the normal display.  
<Clearing the cumulative number of stitches>  
1. When “Cnt” is displayed, press the  
key (6). The  
cumulative number of stitches will change to “0000” and  
the display will flash.  
2. Press the RESET key (7) for two seconds or more. (The  
cumulative number of stitches “0000” will stop flashing  
and illuminate, and the setting will be cleared. )  
3. When the TEST key (1) is pressed, the display will  
return to the normal display.  
5058Q  
BAS-311G, BAS-326G  
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15  
2. FUNCTION SETTINGS  
2-7. Error history checking method  
The past error history can be checked by the following procedure.  
4564Q  
TEST indicator illuminates, Menu indicator switches off  
1. While pressing the  
* Keep pressing the  
key (1), turn on the power switch.  
key (1) until the model name is displayed and the buzzer beeps once.  
The error history sequence number will be displayed in the PROGRAM No. display (2) and the error code will be  
displayed in the menu display (3).  
2. Press the  
or  
key (4) to switch the error history sequentially.  
3. When the TEST key (5) is pressed, the display will return to the normal display and the sewing machine will change to  
home position standby.  
<Display example>  
Details  
If there is no error history  
Error [E110] is displayed first.  
PROGRAM No. display (2)  
Menu display (3)  
[E − − −]  
[000]  
[001]  
[E110]  
• While the  
key (6) is being pressed, the COUNTER indicator will illuminate and the stitch number counter value at the  
point where the error occurred will be displayed in the PROGRAM No. display (2) and the menu display (3) in units of 100  
stitches.  
BAS-311G, BAS-326G  
16  
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2. FUNCTION SETTINGS  
2-8. Input checking method  
Use this to check for any malfunctions of the operation panel keys, circuit boards or sensors, and for checking for broken  
cords and for adjusting sensor positions.  
You can check whether the CPU is correctly reading the signals from keys and sensors.  
4565Q  
4566Q  
1. While pressing the  
* Keep pressing the  
key (1), turn on the power switch.  
key (1) until the model name is displayed and the buzzer beeps once.  
The check code will be displayed in the PROGRAM No. display (2), and the input status will be displayed in the menu  
display (3).  
2. Press the  
key (1) or  
key (4) to select the desired check code.  
If no operations are carried out for 5 seconds after a check code has been selected, the check code and the  
abbreviated input name will flash alternately in the PROGRAM No. display (2).  
3. Refer to the input check list for key and sensor responses.  
4. To return to normal operation, turn off the power switch and then turn it back on again.  
<Input check list>  
PROGRAM No. display  
Menu display  
Input status  
Check item and checking method  
Check code  
Name  
X-axis motor home position sensor signal  
Move the feed mechanism by hand in the X direction.  
X-axis motor encoder counter value  
Move the feed mechanism by hand in the X direction.  
Y-axis motor home position sensor signal  
Move the feed mechanism by hand in the Y direction.  
Y-axis motor encoder counter value  
Move the feed mechanism by hand in the Y direction.  
Work clamp motor home position sensor signal  
Raise the work clamp by hand.  
Work clamp motor encoder counter value  
Raise the work clamp by hand.  
[
[
[
[
[
[
[
1]  
2]  
3]  
4]  
5]  
6]  
7]  
[orX]  
[
H] / [ L]  
[-999] − [999]  
H] / [ L]  
[-999] − [999]  
H] / [ L]  
[-999] − [999]  
0] − [180]  
[EnX]  
[orY]  
[EnY]  
[orP]  
[EnP]  
[Enn]  
[
[
Upper shaft 180 degree rotation signal  
Turn the pulley by hand.  
[
BAS-311G, BAS-326G  
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17  
2. FUNCTION SETTINGS  
PROGRAM No. display  
Menu display  
Input status  
Check item and checking method  
Needle up signal  
Turn the pulley by hand.  
Needle drop signal  
Turn the pulley by hand.  
Power supply voltage  
Displayed as %  
Operation panel input check  
While a key is being pressed, the name of the key will be  
displayed.  
Check code  
Name  
[
[
8]  
9]  
[ UP]  
[
on] / [ oFF]  
on] / [ oFF]  
0] − [ 300]  
[ dn]  
[
[
[ 10]  
[ 11]  
[voL]  
[PnL]  
[*] / [ oFF]  
*ON display  
[rESt]  
Key name  
RESET key  
[tESt]  
TEST key  
[tHrE]  
[ tEn]  
THREAD/CLAMP key  
TENSION/WIND key  
[SELE]  
[UP-M]  
[dn-M]  
SELECT key  
key  
key  
[
[
[
[
F1]  
F2]  
F3]  
F4]  
CF]  
Function key F1  
Function key F2  
Function key F3  
Function key F4  
[
R/W key  
Foot switch analog value (Single pedal specifications)  
Depress the foot switch.  
Work clamp 1st step (2 pedal specifications)  
Depress the foot switch to the 1st step.  
Work clamp 2nd step (2 pedal specifications)  
Depress the foot switch to the 2nd step.  
Start switch (2 pedal specifications)  
Depress the foot switch to the 2nd step.  
STOP switch  
[ 12]  
[ 13]  
[ 14]  
[ 15]  
[FtA]  
[CL1]  
[CL2]  
[Stt]  
[
[
[
[
0] − [ 255]  
on] / [ oFF]  
on] / [ oFF]  
on] / [ oFF]  
[− − on]  
[on − −]  
[− − − −]  
Press the STOP switch.  
[ 16]  
[EMC]  
Machine head switch  
Tilt back the machine head.  
External input error detection (IN13)  
[ 17]  
[ 18]  
[HEd]  
[EXE]  
[
[
on] / [ oFF]  
on] / [ oFF]  
Thread nipper hope position sensor (IN14) (*1)  
Press the  
direction.  
Press the  
direction.  
key to move the thread nipper in the home position  
key to move the thread nipper in the retract  
[ 19]  
[ 20]  
[CAH]  
[rEL]  
[
[
on] / [ oFF]  
on] / [ oFF]  
Thread nipper retract sensor (IN15) (*1)  
Press the  
direction.  
Press the  
direction.  
key to move the thread nipper in the home position  
key to move the thread nipper in the retract  
[ 21]  
[ 22]  
[ 23]  
[ 24]  
[ 25]  
[ 26]  
[ 27]  
[in1]  
[in2]  
[in3]  
[in4]  
[in5]  
[rot]  
[Fib]  
[
[
[
[
[
[
[
on] / [ oFF]  
on] / [ oFF]  
on] / [ oFF]  
on] / [ oFF]  
on] / [ oFF]  
on] / [ oFF]  
on] / [ oFF]  
Option input (IN1)  
Option input (IN2)  
Option input (IN3)  
Option input (IN4)  
Option input (IN5)  
Option input (IN11)  
Fiber-type thread breakage detection [Option compatibility]  
*1 Not used for the BAS-311G and BAS-326G.  
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18  
2. FUNCTION SETTINGS  
PROGRAM No. display  
Menu display  
Input status  
Check item and checking method  
Work clamp home position sensor  
X-feed home position sensor  
Y-feed home position sensor  
Option input (IN6)  
Option input (IN7)  
Option input (IN8)  
Option input (IN9)  
Option input (IN10)  
Check code  
Name  
[Por]  
[Xor]  
[Yor]  
[in6]  
[ 28]  
[ 29]  
[ 30]  
[ 31]  
[
on] / [ oFF]  
on] / [ oFF]  
on] / [ oFF]  
on] / [ oFF]  
on] / [ oFF]  
on] / [ oFF]  
on] / [ oFF]  
on] / [ oFF]  
[
[
[
[
[
[
[
[ 32]  
[in7]  
[ 33]  
[in8]  
[ 34]  
[in9]  
[ 35]  
[in10]  
BAS-311G, BAS-326G  
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19  
2. FUNCTION SETTINGS  
2-9. Output checking method  
Use this to check for any malfunctions of the circuit boards, and for checking for problems with drive mechanisms and  
broken cords.  
You can check whether the signals being output by the CPU are driving the mechanisms correctly.  
1. While pressing the  
* Keep pressing the  
key (1), turn on the power switch.  
key (1) until the model name is  
4567Q  
displayed and the buzzer beeps once.  
The check code will be displayed in the PROGRAM No.  
display (2), and the abbreviated name of the output will  
be displayed in the menu display (3).  
2. Press the  
check code.  
key (4) or  
key (1) to select the desired  
3. The operations for check codes 51 to 54 can be  
checked by pressing the or key (5).  
4. For check codes 55 and onward, depress the foot  
switch to the 2nd step.  
(If using a two-pedal foot switch, lower the work clamp  
before depressing the start switch (6). )  
The corresponding operation for the check code will  
be carried out while the foot switch is being  
depressed (while the foot switch has been depressed  
once for check code 60).  
2nd step  
5. To return to normal operation, turn off the power switch  
and then turn it back on again.  
4441Q 4953Q  
Menu display  
Name  
PROGRAM No. display  
Check code  
Operating details  
When the  
When the  
When the  
When the  
When the  
When the  
When the  
When the  
key is pressed, the work clamp moves to the left.  
key is pressed, the work clamp moves to the right.  
key is pressed, the work clamp moves forward.  
key is pressed, the work clamp moves back.  
key is pressed, the work clamp lifts.  
key is pressed, the work clamp drops.  
key is pressed, the thread nipper moves to the home position.  
key is pressed, the thread nipper moves to the retract position.  
[ 51]  
[ 52]  
[ 53]  
[PM-X]  
[PM-y]  
[PM-F]  
[ 54]  
[CAtH]  
[Option compatibility]  
[ 55]  
[ 56]  
[ 57]  
[ 58]  
[ 59]  
[CL-r]  
[CL-L]  
[Foot]  
[FLiP]  
[CooL]  
Right clamp valve turns on. (OUT16) (*1)  
Left clamp valve turns on. (OUT15) (*1)  
Intermittent presser foot valve turns on. (OUT14) (*1)  
Inner clamping device valve turns on. (OUT13) (*1)  
Needle cooler valve turns on. (OUT12) (*1)  
The panel LEDs illuminate in order, and then the seven segments of the  
PROGRAM No. display and the menu display illuminate one by one.  
[ 60]  
*1 Applies for pneumatic specifications when corresponding devices are installed.  
BAS-311G, BAS-326G  
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2. FUNCTION SETTINGS  
Menu display  
Name  
PROGRAM No. display  
Check code  
Operating details  
Turns on the thread trimming solenoid.  
[ 61]  
[ CUt]  
Turns on the tension release solenoid/digital tension solenoid.  
(*2)  
However, in the case of digital tension, the solenoid turns on at the tension  
that has been set.  
[ 62]  
[ rEL] / [dtEn]  
[ 63]  
[ 64]  
[ 65]  
[ 66]  
[ 67]  
[ 68]  
[ 69]  
[ 70]  
[ 71]  
[ 72]  
[ 73]  
[ 74]  
[ 75]  
[ 76]  
[ 77]  
[ 78]  
[ 79]  
[ WiP]  
[StEP]  
[ oP1]  
[ oP2]  
[ oP3]  
[ oP4]  
[ oP5]  
[ oP6]  
[ oP7]  
[ oP8]  
[ oP9]  
[oP10]  
[oP11]  
[oP17]  
[oP18]  
[oP19]  
[oP20]  
Turns on the thread wiper solenoid.  
Turns on the option solenoid. [Option compatibility]  
Turns on option output 1.  
Turns on option output 2.  
Turns on option output 3.  
Turns on option output 4.  
Turns on option output 5.  
Turns on option output 6.  
Turns on option output 7.  
Turns on option output 8.  
Turns on option output 9.  
Turns on option output 10.  
Turns on option output 11.  
Turns on option output 17.  
Turns on option output 18.  
Turns on option output 19.  
Turns on option output 20.  
*2 Can be determined automatically using a connector shorting pin.  
BAS-311G, BAS-326G  
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2. FUNCTION SETTINGS  
2-10. Software version checking method  
5059Q  
TEST indicator illuminates, Menu indicator switches off  
1. While pressing the  
* Keep pressing the  
key (1), turn on the power. The software version will be displayed in the menu display (2).  
key (1) until the model name is displayed and the buzzer beeps once.  
2. The display in the PROGRAM No. display (4) switches as follows each time the  
or  
key (3) is pressed.  
PROGRAM No. display (4)  
Software  
Main CPU  
Motor CPU  
Panel CPU  
Main CPU (IPL)  
Programmer  
[1.Mn]  
[2.Mt]  
[3.PL]  
[4.iP]  
[5.PG]  
3. When the TEST key (5) is pressed, the display will return to the normal display and the sewing machine will change to  
home position standby.  
BAS-311G, BAS-326G  
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3. READING / WRITING DATA  
3. READING / WRITING DATA  
3-1. Handling data  
Program numbers (100 − 999) are read from CF cards.  
Program numbers (0 − 99) are older BAS-300 series, BAS-300A series and BAS-300E/F series data and can be read from  
floppy disks.  
However, when memory switch No. 755 is set to ON, data for older series models (program numbers 0 − 99) can be  
transferred from a floppy disk to a CF card using a computer and then be read from the CF card.  
*
In such cases, the effective reading mode will be [r 1].  
Option  
0 − 99  
100 − 999  
or  
or  
r1 mode  
r9 mode  
0 − 99  
100 − 999  
Old model series data range  
(BAS***.SEW)  
BAS-311G, BAS-326G data range  
ISM***.SEW  
Sewing machine internal memory  
When memory switch  
No. 755 = ON  
or  
r1 mode  
r1 mode  
Old model series data copied from floppy  
disk to CF card  
(0 − 99)  
100 − 999  
BAS-311G, BAS-326G  
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3. READING / WRITING DATA  
3-2. Notes on handling CF cards (sold separately)  
• Use a CF card with a memory capacity of 32, 64, 128 or 256 MB.  
• Do not disassemble or modify the CF card.  
• Do not bend, drop or scratch CF cards or place heavy objects on top of them.  
• Avoid contact with liquids such as water, oil, solvents or drinks.  
• Use and store CF cards in locations that are free from strong static electricity and electrical interference.  
• Do not use or store CF cards in places where they may be subject to vibrations or shocks, direct sunlight, high  
temperature or humidity or strong magnetic fields from equipment such as speakers, or places which are dusty from thread  
scraps, etc.  
• Do not subject CF cards to shocks or impacts or remove them from the sewing machine while data is being loaded or  
written.  
• The data on the CF cards may become lost or corrupted due to some malfunction or accident. It is recommended that you  
make a backup of important data.  
• CF cards should only be removed after the power for the sewing machine has been turned off.  
• CF cards are already formatted when they are purchased, and so you should not reformat them.  
• The recommended CF cards are commercially-available ones from SanDisk or HAGIWARA SYS-COM. CF cards from  
other manufacturers can be used, but different formatting methods may mean that loading from or writing to such cards  
may not be possible.  
For more information, refer to the documentation provided with the CF card.  
*
This product is compatible with CF cards that have been formatted using the FAT16 method. Cards that have been  
formatted using the FAT32 method cannot be used.  
*
*
CFTM is a trademark of SanDisk Corporation.  
Company names and product names appearing in this manual are trademarks or registered trademarks of the  
respective owners. However, no TM or other similar symbols appear in the main text of this manual.  
3-3. Structure of a CF card folder  
\BROTHER\ISM\ISMSYS\ISM02MN.MOT  
\BROTHER\ISM\ISMDB00\ISMMSW.SEW  
*1 \ISMUPG.SEW  
: Control program  
: Memory switch data  
: User program data  
: Error log data  
\ISMHST.SEW  
\ISMS0100.SEW  
\ISMS0101.SEW  
\ISMS0102.SEW  
: Sewing data P No. = 100  
: Sewing data P No. = 101  
: Sewing data P No. = 102  
*1  
The underlined portion of the name of the \BROTHER\ISM\SMDB00 folder for sewing data can be changed by  
changing the setting for memory switch No. 752 in order to change the folder name. Change the folder name if you  
would like to store sewing data for different sewing machines on a single CF card.  
BAS-311G, BAS-326G  
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3. READING / WRITING DATA  
3-4. Data read/write mode  
With the power turned off, insert the CF card into the CF  
slot.  
1
NOTE:  
• Make sure the CF card is facing the correct way.  
• Always be sure to keep the cover closed except  
when inserting and removing the CF card. If this is  
not done, dust may get inside and cause problems  
with operation.  
• If no valid data can be found, the CF media indicator  
will not illuminate.  
4453Q  
Turn on the power switch.  
2
Switch to data read/write mode.  
While pressing the TEST key, press the R/W key.  
3
• The mode number will appear in the PROGRAM No.  
display, and the setting details for that mode will  
appear in the menu display.  
• The initial mode is sewing data reading mode. (Refer  
to the read/write mode list)  
4574Q  
TEST indicator and CF media indicator illuminate  
Press the  
or  
key to select the mode.  
4
4575Q  
[Read/write mode list]  
PROGRAM No.  
Menu display  
Setting items  
Sewing data is read from the CF card. (*1)  
display  
r 1  
w 2  
r 3  
w 4  
r 5  
w 6  
r 7  
w 8  
r 9  
[-SEd]  
[SEd-]  
[-MEM]  
[MEM-]  
[-UPG]  
[UPG-]  
[-SyS]  
[LoG-]  
[-Fdd]  
Sewing data is written to the CF card.  
Memory switch settings are read from the CF card.  
Memory switch settings are written to the CF card.  
User programs are read from the CF card.  
User programs are written to the CF card.  
Control programs are read from the CF card and used to update the firmware version.  
Error log data is written to the CF card.  
Sewing data is read from the floppy disk. (*2) (*3)  
w 10  
r 11  
w 12  
r 13  
[Fdd-]  
Sewing data is written to the floppy disk. (*2)  
[-EoP]  
[EoP-]  
[oPFd]  
Extended option output (*4) data is read from the CF card.  
Extended option output data is written to the CF card.  
Extended option output data is read from the floppy disk. (*2)  
*1 The sewing data that can be use with this sewing machine is data that has been created for the BAS-311G/BAS-326G.  
*2 Only valid when using an optional floppy disk drive.  
*3 Sewing data for the BAS-300 series, BAS-300A series and BAS-300E/F series can be read.  
*4 Refer to the instruction manual for the programmer for details on extended option output.  
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3. READING / WRITING DATA  
3-5. Reading sewing data from CF cards  
Select the [r 1] data read/write mode.  
1
4576Q  
Press the R/W key.  
2
• [-SEd] will change to [ ALL].  
Press the  
read.  
or  
key to select the program number (100 − 999) to be  
* If [ ALL] is selected, all sewing data (Nos. 100—999) will be read at  
once.  
[When memory switch No. 755 is ON]  
The program number (0 − 99) is also displayed and can be selected.  
If you select [ ALL] at this time, all sewing data (Nos. 0 − 999) will be  
read at once.  
4577Q  
Press the R/W key.  
3
• The buzzer will sound and the selected sewing data will be loaded  
from the CF card and copied into the sewing machine's internal  
memory.  
• The program numbers that have been read will be displayed in the  
menu display.  
* If there is a large volume of data in the CF card, it will take some time  
for all of it to be read. To halt the reading of data, press the STOP  
switch. If you then press the RESET key, the display will change back  
to [ ALL].  
4976Q  
Loading  
End data read/write mode  
Press the TEST key.  
Turn off the power switch, remove the CF card, and then close the cover  
of the CF slot.  
4
TEST indicator switches off  
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3. READING / WRITING DATA  
3-6. Writing sewing data to CF cards  
Select the [w 2] data read/write mode.  
1
4578Q  
Press the R/W key.  
2
• [SEd-] will change to [ ALL].  
Press the  
written.  
or  
key to select the program numbers (100 − 999) to be  
* If you select [ ALL], all sewing data (Nos. 100 − 999) will be written at  
once.  
[When memory switch No. 755 is ON]  
The program numbers (0 − 99) will also be displayed and can be  
selected. If you select [ ALL] at this time, all sewing data (Nos. 0 − 999)  
will be written at once.  
4577Q  
Press the R/W key.  
3
• The buzzer will sound and the selected sewing data will be copied from  
the internal memory onto the CF card.  
• The program numbers that have been written will appear in the  
PROGRAM No. display.  
* If there is a large volume of data in the internal memory, it will take  
some time for all of it to be written. To halt the writing of data, press the  
STOP switch. If you then press the RESET key, the display will change  
back to [ ALL].  
4977Q  
Writing  
End data read/write mode  
Press the TEST key.  
Turn off the power switch, remove the CF card, and then close the cover  
of the CF slot.  
4
TEST indicator switches off  
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3. READING / WRITING DATA  
3-7. Reading memory switch data from CF cards  
Select the [r 3] data read/write mode.  
1
4580Q  
Press the R/W key.  
2
• The buzzer will sound and the memory switch data will  
be loaded from the CF card and copied into the sewing  
machine's internal memory.  
4498Q  
Loading  
When [ End] is displayed, the process is complete.  
Turn off the power switch, remove the CF card, and then  
close the cover of the CF slot.  
3
4581Q  
3-8. Writing memory switch data to CF cards  
Select the [w 4] data read/write mode.  
1
4582Q  
Press the R/W key.  
2
• The buzzer will sound and the memory switch data will  
be copied from the internal memory onto the CF card.  
4579Q  
Writing  
End data read/write mode  
Press the TEST key.  
Turn off the power switch, remove the CF card, and then  
close the cover of the CF slot.  
3
TEST indicator switches off  
BAS-311G, BAS-326G  
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28  
3. READING / WRITING DATA  
3-9. Reading user program data from CF cards  
Select the [r 5] data read/write mode.  
1
4583Q  
Press the R/W key.  
2
• The buzzer will sound and the user program data will  
be loaded from the CF card and copied into the sewing  
machine's internal memory.  
4498Q  
Loading  
When [ End] is displayed, the process is complete.  
Turn off the power switch, remove the CF card, and then  
close the cover of the CF slot.  
3
4581Q  
3-10. Writing user program data to CF cards  
Select the [w 6] data read/write mode.  
1
2
3
4584Q  
Press the R/W key.  
• The buzzer will sound and the user program data will  
be copied from the internal memory onto the CF card.  
4579Q  
Writing  
End data read/write mode  
Press the TEST key.  
Turn off the power switch, remove the CF card, and then  
close the cover of the CF slot.  
TEST indicator switches off  
BAS-311G, BAS-326G  
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29  
3. READING / WRITING DATA  
3-11. Updating the control program  
Select the [r 7] data read/write mode.  
1
4585Q  
Press the R/W key.  
2
3
• [-SyS] will be displayed for a certain amount of time, and  
then the display will change to [ vEr], and after that the  
version number of the control program that is stored on  
the CF card will be displayed.  
Press the R/W key.  
• [ P] will flash in the PROGRAM No. display and the  
control program will be updated.  
NOTE:  
If the filename and folder name for the control program  
are incorrect, error [E421] will be displayed.  
5060Q  
When [ End] is displayed, the process is complete.  
Turn off the power switch, remove the CF card, and then  
close the cover of the CF slot.  
4
NOTE:  
• Version updating may take about 3 − 10 minutes.  
(The time taken will vary depending on the  
manufacturer and storage capacity of the CF card  
being used. )  
• Never remove the CF card or turn off the power  
switch while reading of the CF card is in progress.  
4581Q  
<Restoring the control program if an error occurs during updating>  
If the version updating did not complete normally, such as because of a power outage, the sewing machine will not operate  
correctly.  
If this happens, restore the control program by the following procedure.  
1. Insert the CF card containing the control program data into the CF card slot.  
2. Turn on the power switch. The operation panel will switch off and the version updating will be carried out.  
3. When the initial screen turns back on, the updating is complete. Turn off the power switch, remove the CF card, and  
then close the cover of the CF slot.  
BAS-311G, BAS-326G  
30  
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3. READING / WRITING DATA  
3-12. Writing error log data to CF card  
Select the [w 8] data read/write mode.  
1
5061Q  
Press the R/W key.  
2
• The buzzer will sound and the error log data will be  
copied from the internal memory onto the CF card.  
4579Q  
Writing  
End data read/write mode  
Press the TEST key.  
Turn off the power switch, remove the CF card, and then  
close the cover of the CF slot.  
3
TEST indicator switches off  
3-13. Reading sewing data from floppy disks  
Insert the floppy disk into the floppy disk drive.  
1
Select the [r 9] data read/write mode.  
2
5062Q  
Press the R/W key.  
3
• [-Fdd] will change to [ ALL].  
Press the  
or  
key to select the program number to be read.  
* Program numbers that contain no data will also be displayed at this  
time.  
* If [ ALL] is selected, all sewing data will be read at once.  
4577Q  
BAS-311G, BAS-326G  
31  
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3. READING / WRITING DATA  
Press the R/W key.  
4
• The buzzer will sound and the selected sewing data will be loaded  
from the floppy disk and copied into the sewing machine's internal  
memory.  
• The program numbers that have been read will appear in the menu  
display.  
* If there is a large volume of data in the floppy disk, it will take some  
time for all of it to be read.  
To halt the reading of data, press the STOP switch. If you then  
press the RESET key, the display will change back to [ ALL].  
NOTE:  
If there is no data in the selected program number, error [E421] will  
be displayed. Press the RESET key and then select another  
program number.  
5063Q  
Loading  
End data read/write mode  
Press the TEST key.  
Turn off the power and remove the floppy disk.  
5
TEST indicator switches off  
3-14. Writing sewing data to floppy disks  
Insert the floppy disk into the floppy disk drive.  
1
Select the [w 10] data read/write mode.  
2
5064Q  
Press the R/W key.  
3
• [Fdd-] will change to [ ALL].  
Press the  
be written.  
or  
key to select the program number to  
* If [ ALL] is selected, all sewing data will be written at  
once.  
4577Q  
BAS-311G, BAS-326G  
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32  
3. READING / WRITING DATA  
Press the R/W key.  
4
• The buzzer will sound and the selected sewing data  
will be copied from the internal memory onto the floppy  
disk.  
• The program numbers that have been written will  
appear in the menu display.  
* If there is a large volume of data in the internal  
memory, it will take some time for all of it to be written.  
To halt the writing of data, press the STOP switch. If  
you then press the RESET key, the display will change  
back to [ ALL].  
5065Q  
Writing  
End data read/write mode  
Press the TEST key.  
Turn off the power and remove the floppy disk.  
5
TEST indicator switches off  
3-15. Reading extended option output data from a CF card  
Select the [r 11] data read/write mode.  
1
5066Q  
Press the R/W key.  
2
• The buzzer will sound and the extended option output  
data will be loaded from the CF card and copied into  
the sewing machine's internal memory.  
4498Q  
Loading  
When [ End] is displayed, the process is complete.  
Turn off the power switch, remove the CF card, and then  
close the cover of the CF slot.  
3
4581Q  
BAS-311G, BAS-326G  
33  
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3. READING / WRITING DATA  
3-16. Writing extended option output data to CF cards  
Select the [w 12] data read/write mode.  
1
5067Q  
Press the R/W key.  
2
• The buzzer will sound and the extended option output  
data will be copied from the internal memory onto the  
CF card.  
4579Q  
Writing  
End data read/write mode  
Press the TEST key.  
Turn off the power switch, remove the CF card, and then  
close the cover of the CF slot.  
3
TEST indicator switches off  
3-17. Reading extended option output data from floppy disks  
Insert the floppy disk into the floppy disk drive.  
1
Select the [r 13] data read/write mode.  
2
5068Q  
Press the R/W key.  
3
• The buzzer will sound and the extended option output  
data will be loaded from the floppy disk and copied into  
the sewing machine's internal memory.  
5069Q  
Loading  
When [ End] is displayed, the process is complete.  
Turn off the power and remove the floppy disk.  
4
5070Q  
BAS-311G, BAS-326G  
34  
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4. MECHANICAL DESCRIPTIONS  
4. MECHANICAL DESCRIPTIONS  
The mechanisms operate in the order of the numbers given in the illustrations.  
4-1. Needle bar and thread take-up mechanisms  
5041Q  
1. Motor assy  
2. Upper shaft  
3. Thread take-up crank  
4. Needle bar crank  
5. Needle bar connecting rod  
<5> Thread take-up lever assy  
6. Needle bar clamp  
<6> Thread take-up support  
7. Needle bar  
4-2. Lower shaft and shuttle race mechanisms  
5042Q  
1. Motor assy  
2. Upper shaft  
3. Crank rod assy  
4. Rock gear  
5. Lower gear  
6. Lower shaft  
7. Driver  
8. Shuttle hook  
BAS-311G, BAS-326G  
35  
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4. MECHANICAL DESCRIPTIONS  
4-3. Work clamp lifter mechanism (Solenoid specifications)  
1. Work clamp pulse motor  
2. Work clamp driving gear  
3. Work clamp cam gear  
4. Work clamp cam  
5. Work clamp driving lever  
6. Work clamp lifter link  
7. Work clamp lifter lever  
8. Work clamp lifter plate assy  
5043Q  
9. Slider  
10. Work clamp lifter lever  
11. Connecting rod  
12. Connecting link  
5044Q  
13. Work clamp lifter lever  
14. Work clamp  
36  
BAS-311G, BAS-326G  
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4. MECHANICAL DESCRIPTIONS  
4-4. Work clamp lifter mechanism (Pneumatic specifications)  
5045Q  
1. Air cylinder  
2. Work clamp lifter lever  
3. Work clamp lifter lever  
4. Work clamp  
4-5. Intermittent presser foot lifter mechanism  
1. Work clamp pulse motor  
2. Work clamp driving gear  
3. Work clamp cam gear  
4. Stepping foot driving lever  
5. Stepping clamp lifter rod  
6. Stepping clamp lifter  
7. Stepping clamp lifter link  
8. Stepping clamp link  
9. Stepping clamp link B  
10. Presser bar clamp  
11. Presser bar  
5046Q  
12. Presser foot  
BAS-311G, BAS-326G  
37  
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4. MECHANICAL DESCRIPTIONS  
4-6. Intermittent presser foot stroke mechanism  
5047Q  
1. Motor assy  
2. Upper shaft  
3. Stepping clamp cam  
4. Stepping clamp connecting rod  
5. Stepping clamp arm R  
6. Stepping clamp arm F  
7. Stepping clamp link A  
8. Stepping clamp link A  
9. Stepping clamp link B  
10. Presser bar clamp  
11. Presser bar  
12. Presser foot  
38  
BAS-311G, BAS-326G  
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4. MECHANICAL DESCRIPTIONS  
4-7. Feed mechanism  
Sewing patterns are created through combinations of X and Y movements.  
X direction  
5052Q  
1. X-feed motor assy  
2. Gear  
3. X-feed gear  
4. Y-ball spline  
5. X-GT belt  
6. Feed bracket X  
Y direction  
5053Q  
1. Y-feed motor L assy  
2. Gear  
3. Y-feed gear  
4. Y-GT belt  
5. Feed bracket assy  
BAS-311G, BAS-326G  
39  
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4. MECHANICAL DESCRIPTIONS  
4-8. Thread trimmer mechanism  
5048Q  
1. Thread trimmer solenoid  
2. Solenoid lever  
3. Pushing lever  
4. Driving lever  
5. Thread trimmer collar  
6. Thread trimmer cam  
7. Thread trimmer rod V  
8. Thread trimmer lever V  
9. Thread trimmer lever H  
10. Thread trimmer rod H  
11. Movable knife lever  
12. Movable knife connecting plate  
13. Movable knife  
14. Fixed knife  
40  
BAS-311G, BAS-326G  
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4. MECHANICAL DESCRIPTIONS  
4-9. Tension release mechanism  
1. Tension release solenoid  
2. Bolt  
5049Q  
3. Tension release bar  
4. Tension release pin  
4-10. Thread wiper mechanism  
5050Q  
1. Thread wiper solenoid assy  
2. Thread wiper rod  
3. Thread wiper crank assy  
4. Wiper  
When the thread wiper solenoid assembly is turned off,  
the wiper operates in the opposite direction.  
BAS-311G, BAS-326G  
41  
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5. DISASSEMBLY  
5. DISASSEMBLY  
CAUTION  
Disassembly should only be carried out by a  
qualified technician.  
Use only the proper replacement parts as specified  
by Brother.  
Turn off the power switch before carrying out  
disassembly. If the foot switch is depressed by  
mistake, the sewing machine might start operating  
and injury could result.  
If any safety devices have been removed, be  
absolutely sure to re-install them to their original  
positions and check that they operate correctly  
before using the machine.  
Be sure to wear protective goggles and gloves when  
handling the lubricating oil and grease, so that they  
do not get into your eyes or onto your skin. If the oil  
and grease get into your eyes or onto your skin,  
inflammation can result.  
Any problems in machine operation which result  
from unauthorized modifications to the machine will  
not be covered by the warranty.  
Furthermore, do not drink or eat the lubricating oil or  
grease. They may cause diarrhea or vomiting.  
Keep the oil out of the reach of children.  
Disassemble each part in order of the numbers.  
5-1. Covers  
1. Top cover  
5. Eye guard  
6. Face plate  
7. Shuttle race cover assy  
2. Motor cover  
3. Motor cover R  
4. Motor cover L  
5051Q  
42  
BAS-311G, BAS-326G  
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5. DISASSEMBLY  
5-2. Thread wiper mechanism  
5090Q  
1. Thread wiper solenoid harness (Pull out)  
2. STOP switch harness (Pull out)  
3. Bolt  
4. Plain washer  
5. Removed washer (Assemble)  
6. Removed bolt (Assemble)  
7. Bolts with washer [2 pcs]  
8. Thread wiper unit  
BAS-311G, BAS-326G  
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43  
5. DISASSEMBLY  
5-3. Work clamp arm mechanism  
Pneumatic specifications  
5054Q  
5055Q  
1. Set screw  
2. Needle  
3. Needle bar thread guide  
4. Bolts [4 pcs]  
5. Work clamp assy  
6. Bolts with washer [2pcs]  
7. Feed plate  
44  
BAS-311G, BAS-326G  
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5. DISASSEMBLY  
5-4. Intermittent presser foot lifter mechanism (1)  
5091Q  
1. Adjusting screw nut (Loosen)  
2. Presser adjusting screw  
3. Presser bar spring guide  
4. Presser bar spring  
5. Presser bar spring collar  
6. Screw  
11. Presser foot  
12. Bolt (Loosen)  
13. Presser bar (Pull downward from presser bar clamp)  
14. Set screw (Loosen)  
15. Link shaft (Pull out)  
16. Washer  
7. Shoulder screw  
8. Screw  
17. Stepping clamp lifter link (Remove as unit)  
18. Presser bar  
9. Plain washers [2 pcs]  
10. Finger guard  
19. Bolt (Loosen)  
20. Stepping clamp arm F  
BAS-311G, BAS-326G  
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45  
5. DISASSEMBLY  
5-5. Needle bar mechanism  
5092Q  
Left-hand thread  
5093Q  
Do not remove the slide block guide if  
possible to prevent the machine from  
overheating due to needle bar rubbing.  
1. Rubber cap  
2. Screw  
11. Needle bar connecting rod  
12. Needle bearing  
3. Needle bar  
13. Rubber cap  
4. Needle bar clamp (Pull out)  
5. Slide block  
6. Rubber caps [2 pcs]  
7. Set screws [2 pcs] (Loosen)  
8. Thread take-up support shaft assy  
9. Thread take-up support  
10. Screw (Loosen)  
14. Set screws [3 pcs] (Loosen)  
15. Needle bar crank  
16. Needle bearing  
17. Thread take-up lever assy  
18. Washer  
19. Bolts [2 pcs]  
20. Slide block guide  
46  
BAS-311G, BAS-326G  
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5. DISASSEMBLY  
5-6. Upper shaft mechanism  
Be careful not to drop the needle  
bearing.  
If the motor assembly cannot be removed,  
insert bolts into these two tapping holes  
and gradually tighten them to remove the  
motor assembly.  
5094Q  
1. Screw (Loosen)  
16. Set screws [2 pcs] (Loosen)  
17. Set screws [2 pcs] (Loosen)  
18. Set screws [2 pcs] (Loosen)  
19. Screws [3 pcs] (Loosen)  
20. Fries wheels [2 pcs]  
21. Bolts [4 pcs] (Loosen)  
22. Motor assy  
2. Set screw (Loosen)  
3. Thread take-up crank  
4. Screws [3 pcs] (Loosen)  
5. Crank cover  
6. Bolts [2 pcs]  
7. Crank rod [Upper part]  
8. Needle bearing  
23. Thread trimmer cam  
24. Joint assy  
9. Crank rod [Lower part] (Lower downward)  
10. Rubber cap  
25. Upper shaft  
26. Pulley gear R  
27. Bobbin winder driving wheel  
28. Stepping clamp cam assy  
29. Set screw (Loosen)  
30. Pulley assy  
11. Set screws [2 pcs] (Loosen)  
12. Set screws [2 pcs] (Loosen)  
13. Set screws [2 pcs] (Loosen)  
14. Set screws [2 pcs] (Loosen)  
15. Set screws [2 pcs] (Loosen)  
BAS-311G, BAS-326G  
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47  
5. DISASSEMBLY  
5-7. Lower shaft mechanism  
5095Q  
5096Q  
If the adjusting stud will not pull out,  
insert a M3 screw into the tap hole and  
then pull out the adjusting stud.  
1. Bolt (Loosen)  
2. Driver  
3. Retaining ring E  
4. Set screw (Loosen)  
5. Adjusting stud (Pull out)  
6. Lower shaft assy  
[Pull out from the rear of the machine]  
7. Adjusting stud (Pull out)  
8. Set screw (Loosen)  
9. Screw (Loosen)  
10. Shuttle race base assy  
5097Q  
Remove the rock gear and the  
crank rod together as a single unit.  
11. Set screws [2 pcs] (Loosen)  
12. Set screw (Loosen)  
13. Set screw collar, R  
14. Set screws [2 pcs] (Loosen)  
15. Set screw collar, B  
16. Rock gear shaft  
[Pull out from the rear of the machine]  
17. Rock gear  
18. Crank rod [Lower part]  
5098Q  
48  
BAS-311G, BAS-326G  
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5. DISASSEMBLY  
5-8. Feed covers  
5101Q  
1. Bolts with washer [10 pcs]  
2. Auxiliary plate  
3. Screws [4 pcs]  
4. Bellow assy  
5. Screws [2 pcs]  
6. Cover connecting plate  
7. Screws [16 pcs]  
8. Cover rails [2 pcs]  
9. Inside covers [2 pcs]  
10. Outside covers [2 pcs]  
11. Fixed covers [2 pcs]  
5102Q  
BAS-311G, BAS-326G  
49  
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5. DISASSEMBLY  
5-9. Feed mechanism  
1. Bolts with washer [2 pcs] (Loosen)  
2. Screws [5 pcs], flat screws [3 pcs]  
3. Oil cover  
5103Q  
4. Screws with washer [4 pcs]  
5. Y belt cover  
6. Bolts with washer [3 pcs]  
7. Y-feed motor L assy  
8. Set screws [2 pcs] (Loosen)  
9. Y-feed gear  
10. Retaining ring E  
11. Set screws [2 pcs] (Loosen)  
12. Y-pulley driving shaft  
13. Y-pulley assy  
14. Y-pulley collar  
15. Ball bearings [2 pcs]  
16. Bolts [4 pcs]  
17. Bolts [4 pcs]  
18. Y-belt presser plate  
19. Y-belt support plate  
20. Set screws [2 pcs] (Loosen)  
21. Y-pulley bracket  
22. Y-pulley fulcrum shaft  
23. Y-pulley assy  
24. Y-GT belt  
25. Ball bearings [2 pcs]  
5104Q  
5105Q  
50  
BAS-311G, BAS-326G  
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5. DISASSEMBLY  
26. Bolts with washer [3 pcs]  
27. X-feed motor assy  
28. Set screws [2 pcs] (Loosen)  
29. X-feed gear  
30. Rubber cap  
31. Y-ball spline  
32. Retaining ring C  
33. Plain washer  
34. Ball bearing  
35. Ball bearings [2 pcs]  
36. Bolts [4 pcs]  
37. Washers [4 pcs]  
38. Bolts [8 pcs]  
39. Spring washers [8 pcs]  
40. Plain washers [8 pcs]  
41. Y-LM guides [2 pcs]  
42. Flat screws [16 pcs]  
43. Y-LM spacers [2 pcs]  
5117Q  
5106Q  
5107Q  
BAS-311G, BAS-326G  
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51  
5. DISASSEMBLY  
5118Q  
44. Bolts [10 pcs]  
45. Flat screws [8 pcs]  
46. Feed bracket X  
47. Bolts [16 pcs]  
48. X-LM guide [2 pcs]  
49. Bolts [2 pcs]  
50. X-belt holder  
51. X-belt holder plate  
52. Bolts [2 pcs]  
53. Plain washers [2 pcs]  
54. Set screws [2 pcs] (Loosen)  
55. X-pulley fulcrum shaft  
56. X-pulley bracket  
57. X-right pulley assy  
58. Plain washer  
59. X-GT belt  
52  
BAS-311G, BAS-326G  
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5. DISASSEMBLY  
5-10. Work clamp lifter mechanism (Solenoid specifications)  
5108Q  
1. Shoulder screw  
2. Work clamp spring  
14. Work clamp driving lever  
15. Washer  
3. Rubber cap  
16. Stepping foot driving lever  
17. Set screws [2 pcs] (Loosen)  
18. Set screws [2 pcs] (Loosen)  
19. Screw  
4. Link shoulder screws [2 pcs]  
5. Work clamp lifter link (Pull backward)  
6. Bolts [4 pcs]  
7. Work clamp pulse motor  
(Disconnect the harness)  
8. Set screws [2 pcs] (Loosen)  
9. Work clamp driving gear  
10. Bolts [2 pcs]  
11. Work clamp motor plate  
12. Set screw (Loosen)  
13. Work clamp lever shaft  
20. Plain washer  
21. Retaining ring C  
22. Work clamp fulcrum shaft  
23. Work clamp cam gear  
24. Work clamp cam  
25. Ball bearings [2 pcs]  
BAS-311G, BAS-326G  
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5. DISASSEMBLY  
26. Set screws [2 pcs] (Loosen)  
27. Retaining ring E  
28. Work clamp lever shaft B  
29. Plain washer  
30. Work clamp lifter lever  
31. Slide block  
32. Work clamp lifter plate assy  
33. Bolts [4 pcs]  
34. Slide bush  
Note:  
Hold the work clamp lifter plate assembly when  
removing work clamp lifter lever, otherwise the  
work clamp lifter plate assembly may fall down.  
5109Q  
5-11. Work clamp lifter mechanism (Pneumatic specifications)  
1. Shoulder screw  
2. Bolts [4 pcs]  
3. Work clamp pulse motor (Disconnect the harness)  
4. Set screws [2 pcs] (Loosen)  
5. Work clamp driving gear  
6. Bolts [2 pcs]  
7. Work clamp motor plate  
8. Set screws [2 pcs] (Loosen)  
9. Set screw  
10. Work clamp lever shaft  
11. Set screw collar  
12. Stepping foot driving lever  
13. Set screw (Loosen)  
14. Set screw (Loosen)  
15. Screw  
16. Plain washer  
17. Retaining ring C  
18. Work clamp fulcrum shaft  
19. Work clamp cam gear  
20. Ball bearings [2 pcs]  
5110Q  
54  
BAS-311G, BAS-326G  
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5. DISASSEMBLY  
5-12. Tension release mechanism  
10. Plain washers [2 pcs]  
11. Solenoid setting plate  
12. Bolt  
1. Set screw (Loosen)  
2. Tension bracket assy  
(Pull out)  
3. Tension release pin  
4. Shoulder screws [2 pcs]  
5. O rings [2 pcs]  
6. Solenoid cover  
7. Tension release solenoid  
8. Bolts [2 pcs]  
13. Nut  
14. Plain washer  
15. Solenoid cushion  
16. Tension release bar  
17. Plain washer  
18. Spring  
19. Retaining ring E  
9. Spring washers [2 pcs]  
5111Q  
5-13. Intermittent presser foot lifter mechanism (2)  
1. Flat screw  
2. Set screw (Loosen)  
3. Stepping clamp lifter shaft (Pull out)  
4. Stepping clamp lifter (Pull forward)  
5112Q  
BAS-311G, BAS-326G  
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55  
5. DISASSEMBLY  
5-14. Thread trimmer mechanism  
5113Q  
5114Q  
1. Set screws [2 pcs] (Loosen)  
2. Thread trimmer cam  
3. Screws [3 pcs]  
4. Fan  
5. Bolts with washer [2 pcs]  
6. Set screw  
12. Plain washers [2 pcs]  
13. Solenoid setting plate  
14. Thread trimmer solenoid  
15. Shoulder screw  
16. Pushing lever  
17. Nut  
23. Nut  
24. Shoulder screw B  
25. Driving lever  
26. Set screw  
27. Retaining ring E  
28. Collar shaft  
7. Solenoid lever  
8. Washer  
9. Solenoid cushion  
10. Bolts [2 pcs]  
18. Set screw  
19. Set screw  
20. Guide shaft  
21. Spring  
29. Thread trimmer collar  
30. Screws [2 pcs]  
31. Flat screws [2 pcs]  
32. Needle plate  
11. Spring washers [2 pcs]  
22. Cushion  
56  
BAS-311G, BAS-326G  
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5. DISASSEMBLY  
33. Movable knife shoulder screw  
34. Thrust washer  
35. Movable knife collar  
36. Movable knife assy  
37. Movable knife spacer  
38. Screws [2 pcs]  
39. Plain washers [2 pcs]  
40. Fixed knife  
41. Shoulder screw  
42. Connecting plate  
43. Spring hook  
44. Spring  
45. Bolt  
46. Spring washer  
47. Plain washer  
48. Nut  
5115Q  
50. Thread trimmer rod V  
51. Nut  
52. Shoulder screw B  
53. Set screws [2 pcs] (Loosen)  
54. Thread trimmer lever shaft  
55. Spacers [2 pcs]  
57. Thread trimmer lever V  
58. Thread trimmer lever H  
59. Set screw (Loosen)  
60. Movable knife lever shaft  
61. Movable knife lever  
62. Shoulder screw  
56. Retaining ring, C  
63. Thread trimmer rod H  
49. Shoulder screw B  
5-15. Shuttle hook mechanism  
5116Q  
1. Bobbin case assy  
2. Shuttle race base setting claw  
[Open to right and left]  
3. Shuttle race base  
4. Shuttle hook  
BAS-311G, BAS-326G  
57  
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6. ASSEMBLY  
6. ASSEMBLY  
Assemble each part in order of the numbers.  
Apply grease to the required places when reassembling the parts and once every two years.  
6-1. Thread trimmer mechanism (1)  
Apply grease <GREASE BZL-301 (SA2694-001)> specified by Brother to the portions indicated by the white arrows.  
When the ball joint assembly of thread trimmer rod  
H has been disassembled, assemble it so that the  
distance between the centers of the holes is 376 ±  
Tighten the set screw on the screw flat while lightly  
pressing the thread trimmer lever shaft.  
0.5 mm.  
5134Q  
5135Q  
Tighten the set screw on the screw flat while  
lightly pressing the movable knife lever shaft.  
1. Movable knife lever  
2. Thread trimmer rod H  
3. Shoulder screw  
4. Movable knife lever shaft  
5. Set screw  
9. Thread trimmer lever H  
10. Thread trimmer lever V  
11. Set screws [2 pcs]  
12. Shoulder screw B  
13. Nut  
6. Thread trimmer lever shaft  
7. Retaining ring, C  
8. Spacers [2 pcs]  
14. Spring  
15. Spring hook  
58  
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6. ASSEMBLY  
Assemble so that the wick is  
hanging down.  
Tighten the set screw on the screw  
flat while lightly pressing the collar  
shaft.  
Check that the thread trimmer collar  
turns smoothly.  
5136Q  
Apply grease.  
4853Q  
When the ball joint assembly of  
thread trimmer rod V has been  
disassembled, assemble it so that  
the distance between the centers of  
the holes is 287.5 ± 0.5 mm.  
16. Driving lever  
33. Solenoid cushion  
17. Thread trimmer collar  
18. Collar shaft  
19. Retaining ring, E  
20. Set screw  
21. Thread trimmer rod V  
22. Shoulder screw B  
23. Nut  
34. Washer  
35. Solenoid lever  
36. Set screw  
37. Bolts with washer [2 pcs]  
38. Pushing lever  
39. Shoulder screw  
40. Set screw  
24. Guide shaft  
25. Spring  
26. Cushion  
27. Set screw  
28. Thread trimmer solenoid  
29. Solenoid setting plate  
30. Plain washers [2 pcs]  
31. Spring washers [2 pcs]  
32. Bolts [2 pcs]  
41. Nut  
42. Connecting plate  
43. Shoulder screw  
44. Shoulder screw B  
45. Nut  
46. Plain washer  
47. Spring washer  
48. Bolt  
4615Q  
BAS-311G, BAS-326G  
59  
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6. ASSEMBLY  
6-2. Intermittent presser foot lifter mechanism (1)  
Tighten the set screw on the screw flat while  
lightly pressing the stepping clamp lifter shaft.  
5138Q  
<Stepping clamp lifter rod adjustment>  
Screw the stepping clamp lifter rod in as far as  
it will go, then turn it back 3 times.  
1. Stepping clamp lifter (Insert from the front)  
2. Stepping clamp lifter shaft  
3. Set screw  
Place the oil tube into  
the groove.  
4. Flat screw  
5137Q  
6-3. Tension release mechanism  
Adjust while referring to “7-18. Adjusting  
the tension release amount”.  
Adjust the thread take-up spring  
height while referring to “7-2. Standard  
thread tension”.  
1. Tension release bar  
2. Retaining ring, E  
3. Plain washer  
4. Spring  
5. Tension release solenoid  
6. Solenoid setting plate  
7. Solenoid cushion  
8. Plain washer  
9. Nut  
10. Bolt  
11. Plain washers [2 pcs]  
12. Spring washers [2 pcs]  
13. Bolts [2 pcs]  
14. Solenoid cover  
15. O rings [2 pcs]  
16. Shoulder screws [2 pcs]  
17. Tension release pin  
18. Tension bracket  
19. Set screw  
5139Q  
60  
BAS-311G, BAS-326G  
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6. ASSEMBLY  
6-4. Work clamp lifter mechanism (Solenoid specifications)  
Apply grease <GREASE BZL-301 (SA2694-001)> specified by Brother to the portions indicated by the white arrows.  
5159Q  
1. Ball bearings [2 pcs]  
2. Work clamp cam  
3. Work clamp cam gear  
4. Work clamp fulcrum shaft  
5. Retaining ring C  
6. Plain washer  
7. Screw  
8. Set screws [2 pcs]  
9. Set screws [2 pcs]  
10. Work clamp driving lever  
11. Plain washer  
12. Stepping foot driving lever  
13. Work clamp lever shaft  
14. Set screw  
15. Work clamp lifter link (Insert from the back)  
16. Link shoulder screw  
17. Shoulder screw  
Align the screw stop, and then tighten  
the screw so that there is no play in  
the work clamp driving lever and the  
stepping foot driving lever.  
Check that the work clamp driving  
lever and stepping foot driving lever  
turn smoothly.  
1) Set the work clamp cam gear so that there is no  
clearance between it and the ball bearing in the  
shaft direction, and then align the V groove in the  
work clamp fulcrum shaft with the thread on the  
hole side of the work clamp cam gear. Then tighten  
the set screw.  
2) Set the work clamp cam so that there is no  
clearance between it and the work clamp cam gear  
in the shaft direction, and then align the V groove in  
the work clamp fulcrum shaft with the index mark on  
the work clamp cam. Then tighten the set screw.  
3) Lastly, tighten the two set screws (9).  
Index mark  
5160Q  
5161Q  
BAS-311G, BAS-326G  
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6. ASSEMBLY  
18. Slide bush  
19. Bolts [4 pcs]  
20. Work clamp lifter plate assy  
21. Slide block  
22. Work clamp lifter lever  
23. Work clamp lever shaft B  
24. Plain washer  
25. Retaining ring E  
26. Set screws [2 pcs]  
27. Link shoulder screw  
28. Rubber cap  
5162Q  
Align the set screw with the screw stop and then tighten it so  
that there is no play in the work clamp lifter lever. Check that  
the work clamp lifter lever moves smoothly.  
Place the slide block onto the pin of the work clamp  
lifter lever. The pin and the surface of the slide  
block should be aligned.  
While aligning the slide block with the groove in the  
work clamp lifter plate assembly, pass the work clamp  
lever shaft B through the work clamp lifter lever.  
NOTE:  
When the work clamp lifter plate assembly is  
lowered, the slide block moves away, so hold the  
work clamp lifter plate assembly in place until the  
link shoulder screw is tightened.  
Align  
5163Q  
62  
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6. ASSEMBLY  
5164Q  
Index mark  
1) With the screw stop of the work clamp pulse motor facing  
downward and the index mark on the work clamp driving gear  
facing to the right, adjust so that the clearance between the  
work clamp pulse motor and the work clamp driving gear is 6.2  
mm, and then tighten the two set screws.  
Hook the spring into the arm hole as shown  
in the illustration.  
5166Q  
5167Q  
29. Work clamp pulse motor  
30. Work clamp driving gear  
31. Set screws [2 pcs]  
32. Work clamp motor plate  
33. Bolts [4 pcs]  
34. Bolts [2 pcs]  
35. Work clamp spring  
Index mark  
2) Install the work clamp pulse motor to the work clamp  
motor plate with the four bolts so that the motor  
connector is facing downward.  
3) Align the index marks on the work clamp cam gear  
and the work clamp driving gear, and then install the  
work clamp motor plate with the two bolts so that  
there is no backlash.  
BAS-311G, BAS-326G  
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6. ASSEMBLY  
6-5. Work clamp lifter mechanism (Pneumatic specifications)  
Apply grease <GREASE BZL-301 (SA2694-001)> specified by Brother to the portions indicated by the white arrows.  
Set the work clamp cam gear so that there is no  
clearance between it and the ball bearing in the shaft  
direction, and then align the V groove in the work clamp  
fulcrum shaft with the thread on the hole side of the  
work clamp cam gear. Then tighten the set screw.  
5168Q  
Align the screw stop, and then tighten  
the screw so that there is no play in  
the stepping foot driving lever and the  
set screw collar.  
Check that the stepping foot driving  
lever turns smoothly.  
1. Ball bearings [2 pcs]  
2. Work clamp cam gear  
3. Work clamp fulcrum shaft  
4. Retaining ring C  
5. Plain washer  
5169Q  
6. Screw  
7. Set screw  
8. Set screw  
9. Stepping foot driving lever  
10. Set screw collar  
11. Work clamp lever shaft  
12. Set screw  
13. Set screws [2 pcs]  
14. Shoulder screw  
64  
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6. ASSEMBLY  
Index mark  
1) With the screw stop of the work clamp pulse motor facing  
downward and the index mark on the work clamp driving gear  
facing to the right, adjust so that the clearance between the  
work clamp pulse motor and the work clamp driving gear is 6.2  
mm, and then tighten the two set screws.  
5170Q  
5172Q  
5171Q  
15. Work clamp pulse motor  
16. Work clamp driving gear  
17. Set screws [2 pcs]  
18. Work clamp motor plate  
19. Bolts [4 pcs]  
Index mark  
20. Bolts [2 pcs]  
2) Install the work clamp pulse motor to the work clamp  
motor plate with the four bolts so that the motor  
connector is facing downward.  
3) Align the index marks on the work clamp cam gear  
and the work clamp driving gear, and then install the  
work clamp motor plate with the two bolts so that  
there is no backlash.  
BAS-311G, BAS-326G  
65  
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6. ASSEMBLY  
6-6. Feed mechanism  
Apply grease (AFC manufactured by THK or equivalent) to the areas indicated by the white arrows.  
1. X-pulley bracket  
2. X-GT belt  
3. X-right pulley assy  
4. Ball bearings [2 pcs]  
5. Plain washer  
6. X-pulley fulcrum shaft  
7. Set screws [2 pcs]  
5173Q  
8. X-feed gear  
9. Ball bearings [2 pcs]  
10. Y-ball spline  
11. Set screws [2 pcs]  
12. Ball bearing  
13. Plain washer  
14. Retaining ring C  
NOTE:  
Packing  
Align the ridges in the packing of the nut  
with the grooves in the shaft when inserting  
the shaft. If they are not aligned, the steel  
balls inside the nut will fall out.  
5174Q  
15. Retaining rings C [2 pcs]  
16. Plain washers [2 pcs]  
5175Q  
17. Bolts [2 pcs] (Temporarily tighten)  
66  
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6. ASSEMBLY  
5176Q  
Provisionally tighten the bolts so  
that their heads do not protrude  
from the top of the X-LM guide on  
the inside.  
Engage.  
Push the X-LM guide against the  
positioning pins of the feed  
bracket and then tighten the  
bolts.  
5177Q  
Install the X-belt holder in between the X-LM guides as  
shown in the diagram.  
18. Y-LM spacers [2 pcs]  
26. Feed bracket X  
19. Flat screws [16 pcs]  
20. Y-LM guides [2 pcs]  
21. Plain washers [8 pcs]  
27. Bolts M3X6 [8 pcs]  
28. Bolts M4X8 [2 pcs]  
29. Flat screws [8 pcs]  
22. Spring washers [8 pcs] 30. X-belt holder  
23. Bolts [8 pcs]  
24. X-LM guide [2 pcs]  
25. Bolts [8 pcs]  
31. X-belt holder plate  
32. Bolts [2 pcs]  
5215Q  
BAS-311G, BAS-326G  
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6. ASSEMBLY  
5178Q  
Engage.  
33. Y-pulley bracket  
34. Ball bearings [2 pcs]  
35. Y-pulley assy  
41. Bolts [4 pcs]  
42. Y-pulley assy  
43. Y-pulley collar  
44. Ball bearings [2 pcs]  
45. Y-feed gear  
46. Y-pulley driving shaft  
47. Retaining ring E  
48. Set screws [4 pcs]  
36. Y-GT belt  
37. Y-pulley fulcrum shaft  
38. Set screws [2 pcs]  
39. Y-belt support plate  
40. Y-belt presser plate  
Provisionally tighten the bolts so  
that their heads do not protrude  
from the top of the Y-LM guide at  
the right.  
Place the Y-LM guide against the  
wall of the bed, and then tighten  
the bolts.  
49. Washers [4 pcs]  
50. Bolts [4 pcs]  
51. Bolts [4 pcs]  
52. Bolts with washers [2 pcs]  
(Temporarily tighten)  
5179Q  
68  
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6. ASSEMBLY  
Install so that the backlash is 0.01 –  
0.05.  
5180Q  
Install so that the backlash is 0.01 –  
0.05.  
53. X-feed motor assy  
54. Bolts with washer [3 pcs] (Temporarily tighten)  
55. Y-feed motor L assy  
56. Bolts with washer [3 pcs] (Temporarily tighten)  
57. Y belt cover  
58. Screws with washer [4 pcs]  
59. Oil cover  
60. Screws [5 pcs]  
61. Flat screws [3 pcs]  
5181Q  
BAS-311G, BAS-326G  
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69  
6. ASSEMBLY  
<X-GT belt tension adjustment>  
Measurement position  
5183Q  
1. Move the X feed bracket (1) so that it is in the middle of the sewing area in the Y direction and at the left edge of the  
sewing area in the X direction.  
2. Loosen the two bolts (3) of the X-pulley bracket (2), and then provisionally tighten them at 19.6 mN·m.  
3. Pass the M5x25 screw through the countersunk hole in the side of the bed and screw it into the tap hold in the X-pulley  
bracket (2). Then adjust the belt tension to the following value.  
[For a new belt: 290 – 330 N; For a reused belt: 220 – 250 N]  
4. Tighten the two bolts (3), and then remove the M5x25 screw.  
5. Measure the belt tension once more and check that it is at the following value.  
[For a new belt: 400 – 440 N; For a reused belt: 320 – 350 N]  
*
*
Be sure to use a belt tension gauge to measure the belt tension, and measure from the bottom of the belt.  
The belt tension gauge should be set to measure a unit weight of 0.04 kg/m, a belt width of 30 mm and a span length of  
370 mm.  
*
The recommended belt tension gauge to use is the Dr. TENSION TYPE-ll manufactured by MITSUBOSHI BELTING  
LTD.  
70  
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6. ASSEMBLY  
<Y-GT belt tension adjustment>  
Measurement position  
5184Q  
1. Move the X feed bracket (1) so that it is in the middle of the sewing area in the Y direction and at the left edge of the  
sewing area in the X direction.  
2. Loosen the two bolts (3) of the Y-pulley bracket (2), and then provisionally tighten them at 19.6 mN·m.  
3. Pass the M5x25 screw through the countersunk hole in the side of the bed and screw it into the tap hold in the Y-pulley  
bracket (2). Then adjust the belt tension to the following value.  
[For a new belt: 250 – 320 N; For a reused belt: 160 – 240 N]  
4. Tighten the two bolts (3), and then remove the M5x25 screw.  
5. Measure the belt tension once more and check that it is at the following value.  
[For a new belt: 500 – 600 N; For a reused belt: 400 – 480 N]  
*
*
Be sure to use a belt tension gauge to measure the belt tension, and measure from the bottom of the belt.  
The belt tension gauge should be set to measure a unit weight of 0.04 kg/m, a belt width of 30 mm and a span length of  
370 mm.  
*
The recommended belt tension gauge to use is the Dr. TENSION TYPE-ll manufactured by MITSUBOSHI BELTING  
LTD.  
BAS-311G, BAS-326G  
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6. ASSEMBLY  
<Inside X-LM guide installation>  
1. With tension applied to the X-GT belt and the X-feed  
motor assembly installed, use a push-pull tension  
gauge to push the X feed bracket (1) from one edge  
to the other in the X direction.  
2. Tighten the eight bolts (2) at the place where the load  
is 29 – 59 N (variation within 20 N).  
5185Q  
<Right Y-LM guide installation>  
1. With tension applied to the Y-GT belt and the Y-feed  
motor L assembly installed, use a push-pull tension  
gauge to push the X feed bracket (1) from one edge  
to the other in the Y direction.  
2. Tighten the two bolts (2) at the place where the load  
is 39 – 78 N (variation within 20 N).  
5186Q  
72  
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6. ASSEMBLY  
6-7. Feed covers  
1) Place the inside cover into the groove in the X feed bracket.  
Apply grease (MOLYKOTE LONGTERM W2 manufactured  
by Dow Corning or equivalent) to the areas indicated by the  
white arrows.  
Feed bracket X  
Place the inside cover into the upper cover  
rail, and place the outside cover into the lower  
cover rail.  
2) Set so that the rubber part of the inside cover is on the  
outside of the rubber part of the outside cover and so that the  
stopper of the inside cover is on the inside of the fixed cover.  
5187Q  
5188Q 5189Q  
1. Fixed cover R  
2. Fixed cover L  
3. Cover rail  
4. Screws M4X10 [6 pcs]  
5. Screws M4X4 [2 pcs]  
6. Inside cover R assy (Place into cover rail.)  
7. Inside cover L assy (Place into cover rail.)  
8. Outside cover assemblies [2 pcs]  
(Place into cover rail.)  
9. Cover connecting plate  
10. Screws [2 pcs]  
11. Cover rail  
12. Screws M4X10 [6 pcs]  
13. Screws M4X4 [2 pcs]  
14. Bellow assy  
15. Screws [4 pcs]  
5190Q  
BAS-311G, BAS-326G  
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6. ASSEMBLY  
5191Q  
5192Q  
16. Auxiliary plate brackets [6 pcs]  
17. Bolts with washer [6 pcs]  
18. Auxiliary plate  
Needle plate  
19. Support plate guides [2 pcs]  
20. Auxiliary plate cushions [10 pcs]  
21. Screws [10 pcs] (Tighten to 0.5 N·m.)  
22. Nuts [10 pcs]  
5193Q  
23. Bolts with washer [4 pcs]  
After installing, carry out the adjustments in "7-20-2. X-Y feed home position ".  
74  
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6. ASSEMBLY  
6-8. Upper shaft mechanism  
Apply adhesive (Threebond 1324 or similar) to the  
outside of the bearing of joint assy.  
5140Q  
Install the bobbin winder driving  
wheel so that it is in phase with the  
thread take-up crank and aligned  
with the reference line on the upper  
shaft.  
Reference line  
5204Q  
1） Tighten the screw of the thread take-up crank so that  
1. Upper shaft  
2. Pulley gear R  
3. Bobbin winder driving wheel  
4. Stepping clamp cam assy  
5. Thread take-up crank  
6. Screw  
it is aligned with the upper shaft hole.  
2） While pressing the thread take-up crank so that there  
is no play in it, tighten the two set screws (8).  
Apply adhesive (Threebond 1401 or similar) to the thread  
section of the screw.  
7. Set screw  
8. Set screws [2 pcs]  
9. Set screws [2 pcs]  
10. Rubber cap  
11. Set screws [2 pcs]  
12. Joint assy  
13. Set screws [2 pcs]  
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6. ASSEMBLY  
Tighten the set screw so that the screw stop A on the  
motor shaft is in the same phase as the screw stop B on  
the thread trimmer cam.  
Tighten the set screw so that the screw stop C on the  
upper shaft is at a phase of approximately 180 degrees  
from the screw stop A on the motor shaft.  
4644Q  
Install the motor assembly so that the  
harness is facing downward.  
Adjust while referring to “6-10. Intermittent  
presser foot lifter mechanism (2)”.  
5141Q  
1） Align the index mark D on the thread trimmer cam and  
the index mark E on the joint assembly, and then  
provisionally tighten the set screw at the index mark  
side.  
2） After tightening the set screw at the screw stop side,  
fully tighten the set screw at the index mark side.  
3） Carry out the adjustments in "7-17. Adjusting the  
thread trimmer cam position".  
14. Motor assy  
15. Bolts [4 pcs]  
16. Fries wheels [2 pcs]  
17. Screws [3 pcs]  
Apply the specified grease (GREASE BZL-301) to the  
grooves.  
18. Set screws [2 pcs]  
19. Thread trimmer cam  
20. Set screws [2 pcs]  
21. Set screws [2 pcs]  
22. Set screws [2 pcs] (Temporarily tighten)  
23. Pulley assy  
24. Set screw  
5182Q  
76  
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6. ASSEMBLY  
6-9. Needle bar mechanism  
Apply grease <GREASE BZL-301 (SA2694-001)> specified by Brother to the portions indicated by the white arrows.  
Set so that this hole faces upward, and  
then push in gently while tightening the  
set screw to install.  
Inside hole  
5142Q  
Left-hand thread  
Fit the chamfering side of the  
slide block into the groove on  
the slide block guide.  
After securing the needle bar, position the  
slide block guide so that the machine pulley  
turns smoothly, and then tighten the bolts.  
While gently pushing the needle bar  
crank in the shaft direction, align the  
set screw with the screw stop and then  
tighten the set screw.  
1. Slide block guide  
2. Bolts [2 pcs] (Temporarily tighten)  
3. Washer  
4. Thread take-up lever assy  
5. Needle bearing  
6. Needle bar crank  
7. Set screws [2 pcs]  
8. Set screw  
10. Needle bearing  
11. Screw  
12. Thread take-up support  
13. Thread take-up support shaft assy  
14. Set screws [2 pcs]  
15. Rubber caps [2 pcs]  
16. Rubber cap  
17. Slide block  
9. Needle bearing  
BAS-311G, BAS-326G  
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6. ASSEMBLY  
18. Needle bar clamp  
19. Needle bar (Insert from above)  
20. Screw  
21. Rubber cap  
Inside hole  
Cut section  
5143Q  
Align the needle bar so that reference line A (the second lowest  
reference line on the needle bar) or reference line a (top reference  
line) is aligned with the lower edge of the needle bar bush when the  
machine pulley is turned to raise the needle bar from its lowest  
position, and then set the cut section so that it is facing forward and  
tighten the screw.  
Needle bar  
bush  
4647Q  
78  
BAS-311G, BAS-326G  
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6. ASSEMBLY  
6-10. Intermittent presser foot lifter mechanism (2)  
1) With the needle bar lowered approximately 6.5 mm from  
its highest position, set the stepping clamp arm F to the  
position of the straight line in the illustration.  
2) Place a bushing in between stepping clamp arm F and  
stepping clamp arm R so that there is no play, and then  
tighten the bolt.  
Install the presser bar spring collar as shown in the  
illustration, and then adjust the height of the  
presser adjusting screw to 32 mm.  
5196Q  
5195Q  
At the needle bar timing position,  
align the index marks of the  
stepping clamp cam and the  
stepping clamp connecting rod, and  
then tighten the set screw.  
Notes on the installation position  
(Refer to “7-13. Changing the intermittent stroke”.)  
5197Q  
1. Stepping clamp arm F  
2. Stepping clamp arm R  
3. Set screws [2 pcs]  
4. Bolt  
5. Presser bar clamp  
6. Presser bar  
7. Bolt (Temporarily tighten)  
8. Stepping clamp lifter link  
9. Washer  
10. Link shaft (with retaining ring)  
11. Set screw  
12. Shoulder screw  
13. Screw  
14. Shoulder screw  
15. Screw  
16. Presser bar spring collar  
17. Presser bar spring  
18. Presser bar spring guide  
19. Adjusting screw nut  
20. Presser adjusting screw  
21. Presser foot  
22. Plain washers [2 pcs]  
23. Finger guard  
24. Screw (Temporarily tighten)  
Tighten the set screw on the screw flat  
while lightly pressing the link shaft.  
5194Q  
BAS-311G, BAS-326G  
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6. ASSEMBLY  
After installing the needle plate while referring to “6-13. Thread trimmer mechanism (2)”, carry out the following adjustments.  
5198Q  
5199Q  
1. Turn the work clamp cam gear (1) to move the stepping foot driving lever (2) to the solid line position shown in the  
illustration.  
2. Loosen the two nuts (4) and turn the joint (5) to adjust the height of the roller (3) so that it is 155.5 mm above the top of  
the needle plate.  
3. Lower the needle bar approximately 6.5 mm from its highest position.  
4. Set the height of the presser bar (6) to 41 mm above the needle plate, align the center of the presser foot (7) and the  
needle hole, and then tighten the bolt (8).  
5. Set the height of the presser foot (7) to 22 mm above the needle plate, and then tighten the screw (9).  
6. Turn the work clamp cam gear (1) to move the stepping foot driving lever (2) to the dotted line position shown in the  
illustration.  
7. Set the needle bar to the timing position.  
8. Loosen the nut (10) and turn the bolt (11) to set the height of the presser foot (7) to 0.5 mm above the needle plate.  
80  
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6. ASSEMBLY  
6-11. Lower shaft mechanism  
Tighten the set screw until the head of  
the screw is flush with the edge of the  
bed. (Refer to “7-8. Rotary hook  
lubrication amount”.)  
1. Shuttle race base assy  
2. Set screw  
3. Set screw  
4. Adjusting stud  
5144Q  
While turning the machine pulley, move the  
rock gear back and forth to the position  
where it turns smoothly.  
Place set screw collar R against the edge  
of the bed and tighten the set screw.  
5145Q  
Adjust while referring to “7-19. Adjusting  
the backlash of the lower shaft gear”.  
5. Rock gear shaft  
(Insert from the rear of the machine head)  
6. Rock gear  
7. Set screw collar, B  
8. Set screws [2 pcs]  
9. Set screw collar, R  
10. Set screw (Temporarily tighten)  
11. Set screws [2 pcs] (Temporarily tighten)  
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6. ASSEMBLY  
5146Q  
5147Q  
Provisionally tighten the bolt while lightly  
pressing the driver against the retaining  
ring.  
Mating  
mark  
Insert the crank rod (lower part) into the crank of the  
upper shaft, and then align the mating mark on the  
crank rod (upper part) from above and gently tighten the  
bolts.  
* Check that the machine pulley turns smoothly.  
12. Lower shaft assy  
(Insert from the rear of the machine head)  
13. Retaining ring E  
14. Driver  
15. Bolt (Temporarily tighten)  
16. Adjusting stud  
17. Set screw  
18. Crank rod [Lower part] (Insert into upper shaft crank)  
19. Needle bearing  
20. Crank rod [Upper part] (Align the mating mark)  
21. Bolts [2 pcs]  
22. Crank cover  
23. Screws [3 pcs]  
5148Q  
82  
BAS-311G, BAS-326G  
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6. ASSEMBLY  
6-12. Shuttle hook mechanism  
5150Q  
5149Q  
1. Needle bar thread guide  
2. Needle  
3. Set screw  
4. Shuttle hook  
5. Shuttle race base  
After installing the shuttle hook, carry out the adjustments in “7-4.  
Adjusting the needle bar lift amount”, “7-5. Adjusting the driver needle  
guard” and “7-6. Adjusting the needle clearance”.  
6. Shuttle race base setting claw (Close)  
7. Bobbin  
8. Bobbin case  
6-13. Thread trimmer mechanism (2)  
Apply grease <GREASE BZL-301 (SA2694-001)> specified by Brother to the portions indicated by the white arrows.  
5151Q  
5152Q  
Movable knife  
connecting plate  
1. Fixed knife  
2. Plain washers [2 pcs]  
3. Screws [2 pcs]  
4. Movable knife spacer  
5. Movable knife assy  
6. Movable knife collar  
7. Thrust washer  
Insert the pin of the movable knife assembly into the  
hole in the movable knife connecting plate, and then  
install the needle plate with the screws and flat screws  
so that the needle drops into the center of the needle  
hole.  
8. Movable knife shoulder screw  
9. Needle plate  
10. Screws [2 pcs]  
11. Flat screws [2 pcs]  
BAS-311G, BAS-326G  
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83  
6. ASSEMBLY  
6-14. Work clamp arm mechanism  
Pneumatic specifications  
5200Q  
1. Feed plate  
2. Bolts with washer [2pcs]  
3. Work clamp assy  
4. Plain washers [4 pcs]  
5. Spring washers [4 pcs]  
6. Bolts [4 pcs]  
5201Q  
After installing, carry out test feeding and check that the needle hole is inside the work clamp and the feed plate  
frame. If the needle hole is not inside the frame, adjust the position of the work clamp arm assembly and feed plate.  
84  
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6. ASSEMBLY  
6-14-1. Adjustments after work clamp arm installation  
Solenoid specifications  
Pneumatic specifications  
5202Q  
5203Q  
<Retainer adjustment>  
1. Screw in the M4 tap (1) on the side of the work clamp arm to apply pressure.  
2. Adjust so that the sliding load of the retainers (2) is 40 – 80 N.  
<Work clamp height adjustment (Solenoid specifications)>  
1. Set the work clamp height to “25” on the operation panel.  
2. Loosen the bolt (3).  
3. Set the height of the work clamp (4) to 25 mm above the top of the needle plate, and with the stopper (5) touching the  
connecting link (6), tighten the bolt (3).  
<Work clamp height adjustment (Pneumatic specifications)>  
1. Raise the work clamp arm electronically.  
2. Loosen the bolt (7), lift the work clamp lifter lever (8) by hand to its maximum height, and then tighten the bolt (7).  
3. Loosen the nut (9) of the air cylinder.  
4. Turn the shaft of the air cylinder until the work clamp (10) is 30 mm above the top of the needle plate, and then tighten  
the nut (9).  
<Work clamp adjustment>  
1. Loosen the bolt (11).  
2. Lower the work clamp arm electronically, and in that condition, tighten the work clamp (12) with the bolt (11).  
<Work clamp pressure adjustment>  
1. Loosen the nut (13), and tighten the set screw (14).  
(Up to a maximum of 0.3 mm)  
2. When the work clamp pressure is even at the front and back of the work clamp, tighten the nut (13).  
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6. ASSEMBLY  
6-15. Thread wiper mechanism  
Align the thread wiper shaft bracket  
and the bottom of the arm and then  
tighten the two bolts with washer.  
5153Q  
1. Thread wiper unit  
2. Bolts with washer [2 pcs]  
3. Bolt (Remove)  
4. Plain washer (Remove)  
5. Removed plain washer  
6. Removed bolt  
7. STOP switch harness  
8. Thread wiper solenoid harness  
Adjust the thread wiper after installing. (Refer to “7-11. Adjusting the thread wiper”.)  
86  
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6. ASSEMBLY  
6-16. Covers  
1. Shuttle race cover assy  
2. Screws [2 pcs]  
3. Face plate assy  
4. Screws [3 pcs]  
5. Eye guard assy  
6. Plain washers [2 pcs]  
7. Screws [2 pcs]  
8. Motor cover L  
9. Screws [4 pcs]  
10. Motor cover R  
11. Screws [4 pcs]  
12. Motor cover  
13. Screws [4 pcs]  
14. Top cover  
5154Q  
15. Screws [6 pcs]  
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7. ADJUSTMENT  
7. ADJUSTMENT  
CAUTION  
Maintenance and inspection of the sewing machine  
should only be carried out by a qualified technician.  
Hold the machine head with both hands when tilting it  
back or returning it to its original position.  
In addition, do not apply excessive force when tilting  
back the machine head. The sewing machine may  
become unbalanced and fall down, and serious injury  
or damage to the sewing machine may result.  
Ask your Brother dealer or a qualified electrician to  
carry out any maintenance and inspection of the  
electrical system.  
If the power switch needs to be left on when carrying  
out some adjustment, be extremely careful to  
observe all safety precautions.  
Turn off the power switch and disconnect the power  
cord before carrying out the following operations.  
If the foot switch is depressed by mistake, the sewing  
machine might start operating and injury could result.  
If any safety devices have been removed, be  
absolutely sure to re-install them to their original  
positions and check that they operate correctly  
before using the machine.  
• Inspection, adjustment and maintenance  
• Replacing consumable parts such as the rotary  
hook  
7-1. Checking the machine head switch  
Check that the machine head switch is turned on as shown  
in the illustration.  
NOTE:  
If the machine head switch is not turned on, errors  
"E050", "E051" and "E055" will be generated.  
5226Q  
BAS-311G, BAS-326G  
88  
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7. ADJUSTMENT  
7-2. Standard thread tension  
Specifications  
Upper thread  
Heavy-weight materials (-01)  
Medium-weight materials (-02)  
#50 or similar  
#20 or similar  
#20 or similar  
1.4 − 1.8  
Lower thread  
#50 or similar  
Upper thread tension (N)  
Lower thread tension (N)  
0.8 − 1.2  
0.2 − 0.3  
7 − 10  
Thread take-up spring height  
(mm)  
Thread take-up spring  
tension (N)  
0.6 − 1.2  
0.2 − 0.5  
Pre-tension (N)  
Needle  
0.1 − 0.6  
DP x 17 #19  
2,000 rpm  
0.1 − 0.3  
DP x 5 #16  
2,000 rpm  
Normal sewing speed  
7-2-1. Upper and lower thread tension  
4661Q  
5155Q  
BAS-311G, BAS-326G  
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7. ADJUSTMENT  
7-2-2. Thread take-up spring  
<Thread take-up spring height>  
Loosen the set screw (1) and turn the adjuster to adjust.  
Higher  
Lower  
5022Q  
<Thread take-up spring tension>  
Stronger  
Weaker  
4664Q  
5023Q  
Turn the tension stud (2) with a screwdriver to adjust the tension.  
NOTE:  
If the thread tension spring is not adjusted correctly, the upper thread trailing length will be uneven after thread trimming.  
7-2-3. Arm thread guide R  
The standard position of arm thread guide R (1) is when the  
screw (2) is aligned with the index mark.  
Loosen the screw (2) and move arm thread guide R (1) to  
adjust.  
* When sewing heavy material, move arm thread guide R  
(1) to the left. (The thread take-up amount will become  
greater.)  
* When sewing light material, move arm thread guide R (1)  
to the right. (The thread take-up amount will become less.)  
More thread  
Less thread  
Index mark  
5030Q  
BAS-311G, BAS-326G  
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7. ADJUSTMENT  
7-3. Adjusting the needle bar height  
2552Q  
4992Q  
Turn the machine pulley to move the needle bar to the lowest position. Then remove the rubber plug (2), loosen the screw  
(3) and then move the needle bar up or down to adjust so that the second reference line from the bottom of the needle bar  
(reference line A) is aligned with the lower edge of the needle bar bush (1).  
* If using a DP X 5 needle, use the highest reference line (reference line a).  
7-4. Adjusting the needle bar lift amount  
Needle center  
Rotary hook tip  
2554Q  
0135Q  
4993Q  
Turn the machine pulley to raise the needle bar from the lowest position until the lowest reference line on the needle bar  
(reference line B) is aligned with the lower edge of the needle bar bush (1), and then loosen the bolt (2) and move the driver  
(3) so that the tip of the rotary hook is aligned with the center of the needle.  
* If using a DP X 5 needle, use the second reference line from the top of the needle bar (reference line b).  
7-5. Adjusting the driver needle guard  
Needle center  
Rotary hook tip  
0135Q  
2555Q  
5227Q  
Turn the machine pulley to align the tip of the rotary hook with the center of the needle, and then loosen the set screw (2)  
and turn the eccentric shaft (3) to adjust so that the driver needle guard (1) is touching the needle.  
NOTE:  
If it crosses the needle more than necessary, it will place a load on the needle, or it may cause poor thread tension.  
Furthermore, if it does not cross the needle at all, the tip of the rotary hook will interfere with the needle and skipped  
stitches may occur.  
BAS-311G, BAS-326G  
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7. ADJUSTMENT  
7-6. Adjusting the needle clearance  
0.01 − 0.08mm  
0138Q  
4995Q  
Turn the machine pulley to align the tip of the rotary hook with the center of the needle, and then loosen the set screw (1)  
and turn the eccentric shaft (2) to adjust so that the clearance between the needle and the rotary hook is 0.01 − 0.08 mm.  
7-7. Adjusting the shuttle race thread guide  
3574Q  
Install the shuttle race thread guide (1) by pushing it in the direction of the arrow so that the needle groove is aligned with  
the center of the needle plate hole.  
NOTE:  
If the shuttle race thread guide is in the wrong position, thread breakages, soiled thread or tangling of the thread may  
occur.  
The position of the shuttle race thread guide is adjusted at the time of shipment from the factory. It should not be  
changed if possible.  
7-8. Rotary hook lubrication amount  
The optimum position is when the head of the set screw (1)  
is aligned with the edge of the bed. The rotary hook  
lubrication amount can be adjusted within three turns to the  
right from that position.  
More oil  
Less oil  
• If the set screw (1) is turned clockwise, the lubrication  
amount becomes smaller.  
• If the set screw (1) is turned counterclockwise, the  
lubrication amount becomes greater.  
Aligned  
4996Q  
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7. ADJUSTMENT  
7-9. Adjusting the position of the movable knife  
4950Q  
5232Q 5234Q  
<View from side of thread trimmer cam>  
Reverse position  
5255Q  
5233Q  
1. Open the top cover and tilt back the machine head.  
2. Turn the pulley (1) by hand to lower the needle bar to its lowest position, and push the thread trimmer solenoid (2) as far  
as it will go.  
3. With the collar (3) inserted into the groove of the thread trimmer cam (4), turn the pulley (1) by hand to set the driving  
lever (5) to the reverse position (when the thread take-up (6) is close to its lowest position).  
5235Q  
5236Q  
4. Loosen the bolt (7).  
5. Move the thread trimming rod H (9) forward or back to adjust so that the distance from the ridge line on the right side of  
the needle plate to the ridge line on the movable knife (8) is 9.5 − 9.9 mm.  
6. After tightening the bolt (7), check the above position once more.  
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7. ADJUSTMENT  
4950Q  
5237Q  
5238Q  
7. Turn the pulley (1) by hand to move the needle bar to its lowest position.  
8. Loosen the nut (10), tighten the set screw (11) until the collar (3) is touching the inside of the groove in the thread trimmer  
cam (4), and then turn it back in the counterclockwise direction by approximately 1/4 of a turn.  
9. Tighten the nut (10), and then check that the collar (3) is not touching the inside of the groove in the thread trimmer cam  
(4). In addition, push the driving lever (5) by hand toward the thread trimmer cam until the collar (3) touches the groove of  
the thread trimmer cam (4), and then check that the driving lever (5) returns smoothly to its original position when it is  
released.  
10. Check that there is a gap of about 0 - 1 mm between the outside of the hole in the movable knife (8) and the ridge line on  
the shuttle race thread guide (12) when there is still play between the parts.  
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7. ADJUSTMENT  
7-10. Replacing the movable and fixed knives  
5002Q  
1. Loosen the two bolts (1) and then remove the feed plate (2).  
2. Open the shuttle race cover, remove the two screws (3) and the two flat screws (4), and then remove the needle plate (5).  
3. Remove the movable knife (6) and the fixed knife (7).  
5003Q  
5004Q  
4. Install the new fixed knife (7) in the position shown in the illustration.  
5. Apply grease to the outside of the collar (8) and to the shoulder screw (9), and then install the new movable knife (6)  
together with the thrust washer (10) and the movable knife spacer (11).  
6. Check that the movable knife (6) and fixed knife (7) cut the thread cleanly. Replace the movable knife spacer with  
accessory spacers (t=0.2, 0.3, 0.4) so that the knives trim the thread accurately.  
* If the knife pressure is too weak and the thread is not completely cut, use a thinner movable knife spacer.  
* If the knife pressure is too strong and the movable knife (1) turns stiffly, use a thicker movable knife spacer.  
7. Apply grease to the pin (12), place it into the movable knife connecting plate (13), and install it to the needle plate (5).  
8. Check that the needle is aligned with the center of the needle hole.  
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7. ADJUSTMENT  
7-10-1. Installing the feed plate  
While pressing the THREAD/CLAMP key, turn on the power  
switch.  
1
All indicators switch off  
*
Keep pressing the THREAD/CLAMP key until the model  
name is displayed and the buzzer beeps once.  
•
"CLMP" will appear in the menu display.  
MENU indicator switches off  
THREAD/CLAMP indicator illuminates  
5005Q 4421Q  
Depress the foot switch to the 2nd step.  
(If using a two-pedal foot switch, lower the work clamp before  
depressing the start switch.)  
2
3
2nd step  
•
After the home position is detected and the work clamp drops, the  
feed mechanism will move to the feed plate installation position and  
then the work clamp will rise.  
4441Q  
Index  
mark  
Use a 2 mm diameter pin to align the holes in the X feed bracket (1) and the needle plate (2) with the two holes in the  
feed plate (3), and then tighten the two bolts (4).  
NOTE: Install the feed plate so that the surface with the index mark is facing upward.  
5006Q  
End feed plate installation mode  
Turn off the power.  
4
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7. ADJUSTMENT  
7-11. Adjusting the thread wiper  
Approx. 2mm  
Approx. 3mm  
5007Q  
5008Q  
5009Q  
1. Loosen the two screws (3) and shift the entire solenoid setting plate (4) up or down to adjust so that the thread wiper (2) is  
15 mm in front of the needle center when the plunger (1) of the thread wiper solenoid is driven to the full stroke.  
2. Loosen the screw (5) and adjust the position of the thread wiper (2) so that the distance from the thread wiper to the tip of  
the needle is approximately 2 mm and the tip of the thread wiper (2) is approximately 3 mm from the center of the needle  
when the thread wiper (2) passes below the needle during operation.  
NOTE: Check that the thread wiper (2) does not touch the finger guard.  
7-12. Presser foot installation position  
Install the presser foot (1) with the screw (2) so that the  
distance from the bottom of the presser foot to the top of the  
needle plate is 22 mm when the sewing machine is stopped  
and the presser foot (1) is raised.  
5031Q  
BAS-311G, BAS-326G  
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7. ADJUSTMENT  
7-13. Changing the intermittent stroke  
The intermittent stroke can be adjusted to within 2 − 10 mm by adjusting the position of the stepping clamp connecting rod  
and changing the installation position of stepping clamp link A.  
<Changing the installation position of stepping clamp link A>  
5010Q  
5011Q  
1. Remove the face plate.  
2. Remove the two screws (1) and the two shoulder screws (2), and then remove stepping clamp link A (3).  
3. Change the installation position for stepping clamp link A (3) to either A, B or C above.  
If the position of the stepping clamp connecting rod is adjusted as described in the following at any one of the installation  
positions, the adjustment range for the intermittent stroke will as given in the following table.  
Installation position  
Intermittent stroke range  
2 − 4.5mm  
A
B
C
4.5 − 10mm  
0 mm (Presser foot does not move up and down)  
5012Q  
BAS-311G, BAS-326G  
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7. ADJUSTMENT  
<Stepping clamp connecting rod position adjustment>  
5014Q  
Index mark  
5013Q  
5015Q  
1. Loosen the screw (1), and then open the cover (2).  
2. Loosen the nut (3), and then adjust the position of the stepping clamp connecting rod (4).  
• When the stepping clamp connecting rod (4) is raised, the intermittent stroke will increase.  
• When the stepping clamp connecting rod (4) is lowered, the intermittent stroke will decrease.  
Next, adjust the needle bar and presser foot timing.  
3. Turn the machine pulley to raise the needle bar from the lowest position until the lowest reference line on the needle bar  
(reference line B) is aligned with the lower edge of the needle bar bush (5).  
(If using a DP x 5 needle, align with the second reference line from the top (reference line b).)  
4. Open the top cover and loosen the two set screws (6).  
5. Align the index marks on the stepping clamp cam (7) and the stepping clamp connecting rod (4), and then tighten the set  
screws (6).  
5016Q 5228Q  
Check the following after changing the intermittent stroke.  
Needle plate  
1. With the intermittent presser foot (1) lowered, turn the pulley to move the intermittent presser foot (1) to its lowest  
position.  
2. Check that the presser foot (1) does not touch the needle plate and that the presser bar clamp (2) does not touch  
the presser bar bush (3).  
<If they are touching>  
Remove the motor cover (4).  
Loosen the nut (5), and turn the bolt (6) until it is pressing against the intermittent drive lever (7), and then adjust until  
the two points mentioned above are not touching.  
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7. ADJUSTMENT  
7-14. Adjusting the work clamp lift amount  
<Solenoid specifications>  
The operation panel settings can be used to adjust the height to within 15 − 25 mm. (Refer to "5-7. Setting the work clamp lift  
amount.")  
<Pneumatic specifications>  
The maximum lift amount for the work clamp is 30 mm above the top of the needle plate.  
Max. 30mm  
5018Q  
5019Q  
1. Turn on the air, and depress the work clamp switch (1) to raise the work clamp (2).  
2. Loosen the two bolts (4) of the work clamp arm lever (3), and move the work clamp arm lever (3) up or down to adjust.  
7-15. Adjusting the air pressure (pneumatic specifications)  
Lift up the handle (2) of the regulator (1) and then turn it to  
adjust the air pressure to 0.5 MPa.  
After adjustment is complete, push the handle (2)  
downward to lock it.  
If water has collected in the bottle of the regulator (1), turn  
the drain cock (3) in the direction indicated by an arrow to  
drain the water.  
NOTE:  
Open the air cock (4) slowly.  
5020Q  
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7. ADJUSTMENT  
7-16. Adjusting the thread trimmer cam position  
1. Remove the top cover.  
2. Loosen the two set screws (1), and then adjust the  
position of the thread trimmer cam (3) so that the  
distance between the edge of the collar shaft (2) and  
the edge of the thread trimmer cam (3) is 0.2 - 0.5 mm.  
After adjusting, tighten the two set screws (1).  
4685Q  
7-17. Belt tension adjustment  
<X-GT belt>  
Measurement position  
5213Q  
1. Move the X feed bracket (1) so that it is in the middle of the sewing area in the Y direction and at the left edge of the  
sewing area in the X direction.  
2. Loosen the two bolts (3) of the X-pulley bracket (2), and then provisionally tighten them at 19.6 mN·m.  
3. Pass the M5x25 screw through the countersunk hole in the side of the bed and screw it into the tap hold in the X-pulley  
bracket (2). Then adjust the belt tension to 220 - 250 N.  
4. Tighten the two bolts (3), and then remove the M5x25 screw.  
5. Measure the belt tension once more and check that it is 320 - 350 N.  
*
*
Be sure to use a belt tension gauge to measure the belt tension, and measure from the bottom of the belt.  
The belt tension gauge should be set to measure a unit weight of 0.04 kg/m, a belt width of 30 mm and a span length of  
370 mm.  
*
The recommended belt tension gauge to use is the Dr. TENSION TYPE-ll manufactured by MITSUBOSHI BELTING  
LTD.  
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7. ADJUSTMENT  
<Y-GT belt>  
Measurement position  
5214Q  
1. Move the X feed bracket (1) so that it is in the middle of the sewing area in the Y direction and at the left edge of the  
sewing area in the X direction.  
2. Loosen the two bolts (3) of the Y-pulley bracket (2), and then provisionally tighten them at 19.6 mN·m.  
3. Pass the M5x25 screw through the countersunk hole in the side of the bed and screw it into the tap hold in the Y-pulley  
bracket (2). Then adjust the belt tension to 160 – 240 N.  
4. Tighten the two bolts (3), and then remove the M5x25 screw.  
5. Measure the belt tension once more and check that it is 400 – 480 N.  
*
*
Be sure to use a belt tension gauge to measure the belt tension, and measure from the bottom of the belt.  
The belt tension gauge should be set to measure a unit weight of 0.04 kg/m, a belt width of 30 mm and a span length of  
370 mm.  
*
The recommended belt tension gauge to use is the Dr. TENSION TYPE-ll manufactured by MITSUBOSHI BELTING  
LTD.  
7-18. Adjusting the tension release amount  
5156Q  
4689Q  
1. Loosen the nut (4) and turn the bolt (2) to adjust so that the distance between the tip of the bolt (2) and the solenoid  
setting plate (3) is 16.5 mm when the plunger of the tension release solenoid (1) is pushed in as far as it will go.  
2. Check that the tension disc opening amount is 1.0 - 1.5 mm when the tension release solenoid (1) is installed to the arm  
and the plunger is pushed with a screwdriver or similar tool through the hole in the solenoid cover.  
*
If memory switch No. 552 has been set so that the tension release timing is early, you can increase the trailing length for  
the upper thread.  
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7. ADJUSTMENT  
7-19. Adjusting the backlash of the lower shaft gear  
1. Gently tilt back the machine head.  
2. Remove the five screws (1) and three flat screws (2),  
and then remove the oil cover (3).  
3. Remove the four screws (4) and Y-belt cover (5).  
5240Q  
5157Q  
5256Q  
4. Loosen the two set screws (6).  
5. Place set screw collar R (7) against the edge of the bed so that the pulley can turn easily.  
* If the pulley cannot turn easily, loosen the set screw (8) and turn the pulley while moving the rock gear (9) back and  
forth. At the position where the pulley moves freely, place set screw collar R (7) against the edge of the bed and  
tighten the set screw (8).  
6. Turn the rock gear shaft (10) to adjust the play at the end of the driver (11) to 0.05 – 0.15 mm, and tighten the set  
screws (6).  
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7. ADJUSTMENT  
7-20. Adjusting the home position  
7-20-1. Work clamp lift home position  
Turn the pulley to set the needle to the needle up stop position.  
1
While pressing the  
the power switch.  
* Keep pressing the  
keys simultaneously, turn on  
keys until the model name is  
2
displayed and the buzzer beeps once.  
• "orG" will flash in the PROGRAM No. display and the  
offset value (default: 0) will be displayed in the menu  
display.  
5205Q 4443Q 4421Q  
TEST indicator and THREAD/CLAMP indicator light  
Press the RESET key.  
3
4
• Home position detection will be carried out, and the work clamp will stop at the  
currently-registered home position.  
* If you press the RESET key for 2 seconds or more at this time, the offset value will be reset  
to “  
0 ”.  
Press the  
or  
key to change the offset value (-999  
<Solenoid specifications>  
to 999) so that the work clamp lifter plate (1) moves to the  
position where it starts to lower.  
• The work clamp lifter plate (1) will move in conjunction  
with the setting value.  
Touch the bottom of the work clamp lifter plate and check  
the position where it starts to lower.  
5206Q 5208Q  
Remove the motor cover, align the index marks of the  
work clamp cam gear (2) and the work clamp driving gear  
<Pneumatic specifications>  
(3) to the center line, and then press the  
change the offset value (-999 – 999).  
or  
key to  
• The work clamp driving gear (3) will move in  
Index mark  
conjunction with the setting value.  
5207Q 5208Q  
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7. ADJUSTMENT  
Press the RESET key.  
• The work clamp will move to the home position. Check  
the home position.  
5
Repeat steps 4 and 5 to adjust the home position.  
End adjustment mode.  
7
8
Press the TEST key.  
• The display will return to the normal display and the  
sewing machine will switch to home position detection  
standby.  
TEST indicator switches off  
NOTE:  
Always be sure to press the RESET key and check the home position before ending adjustment mode. If you end  
adjustment mode without checking the home position, error "E303" may be generated.  
7-20-2. X-Y feed home position  
Turn the pulley to set the needle to the needle up stop position.  
1
While pressing the  
the power switch.  
* Keep pressing the  
keys simultaneously, turn on  
keys until the model name is  
2
displayed and the buzzer beeps once.  
• "orG" will flash in the PROGRAM No. display and the  
offset value (default: 0) will be displayed in the menu  
display.  
5205Q 4443Q 4421Q  
TEST indicator and X-SCALE indicator light  
Press the SELECT key so that either the X-SCALE  
indicator or the Y-SCALE indicator illuminates.  
3
4
4570Q  
Press the RESET key.  
• Home position detection will be carried out, and the feed mechanism will stop at the  
currently-registered home position.  
* If you press the RESET key for 2 seconds or more at this time, the offset value will be reset  
to “  
0 ”.  
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7. ADJUSTMENT  
5
Use 2 mm diameter pins (shaped like a needle) to align the holes in the X feed bracket (1) and the needle plate (2)  
with the two holes in the home position reference plate (3), press the or key to change the offset value (-999 –  
999) in order to lower the needle to the home position.  
• The feed mechanism will move in conjunction with the setting value.  
Once the home position is aligned, tighten the two bolts (4) and remove the pins (shaped like a needle).  
5208Q 5276Q  
Press the RESET key.  
6
• The feed mechanism will move to the home position.  
Check the home position. Once the home position is  
correctly aligned, remove the home position reference  
plate (3).  
Repeat steps 5 and 6 to adjust the home position.  
End adjustment mode.  
7
8
Press the TEST key.  
• The display will return to the normal display and the  
sewing machine will switch to home position detection  
standby.  
TEST indicator switches off  
NOTE:  
Always be sure to press the RESET key and check the home position before ending adjustment mode. If you end  
adjustment mode without checking the home position, error "E202" may be generated.  
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7. ADJUSTMENT  
7-21. Adjusting the needle up stop home position  
1. Remove the needle and the needle bar thread guide.  
2. Turn the pulley to move the needle bar (1) to the lowest  
position.  
3. Remove the rubber cap (2) from the face plate, and  
then loosen the screw (3) of the needle bar clamp.  
4. Adjust so that the distance h is as shown below when  
the needle bar is at its lowest position.  
5. Tighten the screw (3), and then install the rubber cap  
(2).  
6. Turn the machine pulley to lower the needle bar (1)  
from its highest position to height H.  
Needle  
DP x 17  
55.5 mm  
18.0 mm  
DP x 5  
50.4 mm  
12.9 mm  
H
h
Needle plate  
5209Q  
4700Q  
5210Q  
7. While pressing the  
* Keep pressing the  
8. Press the  
key (4), turn on the power switch.  
key (4) until the model name is displayed and the buzzer beeps once.  
key (4) or key (5) to select check code “ 8 ”. (Refer to “2-8. Input checking method”.)  
9. Remove the fries wheels and loosen the bolt (7) of the magnet (6) by 1/4 of a turn.  
10. Move the magnet (6) to the precise point where the menu display switches from “ on” to “ oFF”, and then tighten the  
bolt (7).  
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7. ADJUSTMENT  
7-22. Adjusting the needle up stop position  
5211Q  
5216Q  
Use the operation panel to adjust the needle up stop position so that the needle bar (1) is lowered 6.2 – 6.7 mm from its  
highest position (near the highest stop position for the thread take-up).  
NOTE:  
When the four bolts (2) of the sewing machine motor and the bolt (3) of the magnet are loosened, the feed timing may  
move out of adjustment. Do not loosen these bolts when the settings are at the factory defaults or after adjusting the  
needle up stop home position.  
[Adjustment method]  
1
While pressing the  
the power switch.  
* Keep pressing the  
keys simultaneously, turn on  
keys until the model name is  
displayed and the buzzer beeps once.  
• "orG" will flash in the PROGRAM No. display and the  
offset value will be displayed in the menu display.  
4703Q 4448Q 4421Q  
TEST indicator and SPEED indicator light  
Depress the foot switch to the 2nd step.  
2
(If using a two-pedal foot switch, lower the work clamp before  
depressing the start switch.)  
• X-Y home position detection will be carried out and the "orG" will  
stop flashing and illuminate steadily.  
2nd step  
4441Q  
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7. ADJUSTMENT  
Press the  
• When you press the  
press the  
or  
key to set the offset value (-9 - 10).  
key, the needle bar will drop, and when you  
key, it will rise.  
3
NOTE:  
After changing the offset value, check that the thread trimming  
operation is normal and that error [E110] is not generated.  
5212Q  
Depress the foot switch to the 2nd step.  
(If using a two-pedal foot switch, lower the work clamp before  
depressing the start switch.)  
• The upper shaft will move and stop at the offset value that has been  
set.  
4
5
2nd step  
4441Q  
End adjustment mode.  
Press the TEST key.  
• The offset value will be memorized and the sewing machine will  
switch to home position detection standby.  
TEST indicator switches off  
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8. ELECTRICAL MECHANISM  
8. ELECTRICAL MECHANISM  
DANGER  
Wait at least 5 minutes after turning off the power switch and disconnecting the power cord from the wall outlet  
before opening the cover of the control box. Touching areas where high voltages are present can result in severe  
injury.  
8-1. Precautions while carrying out adjustments  
Be sure to note the following cautions when opening the control box to carry out inspections and adjustments.  
Electric shocks  
High voltages can remain in large-capacity capacitors for up to 5 minutes in some circumstances, even when the power has  
been turned off. Accordingly, wait at least 5 minutes after turning off the power before carrying out the following operations.  
• Opening and closing the control box  
• Replacing fuses  
• Inserting and disconnecting connectors  
• Measuring resistance values  
• Any other tasks that may involve touching components inside the control box  
Some inspection items require the control box to be open when the power is turned on and voltages are measured.  
At such times, be extremely careful never to touch anywhere other than the specified locations. In addition, note that high  
voltages may remain for up to 5 minutes after the power is turned off.  
Injury  
The fan inside the control box turns while the power is turned on, so be careful not to get anything caught in it.  
Be careful not to touch metallic objects such as the heat sink and cover when connecting and disconnecting connectors and  
making measurements.  
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8. ELECTRICAL MECHANISM  
8-2. Inside the control box and operation panel structure  
Main P.C. board  
Secured to the side. This is the P.C. board that controls sewing machine operation.  
PMD P.C. board  
Secured to the base plate. This P.C. board drives the pulse motors and solenoids.  
Power supply motor P.C. board  
Secured to the rear. This P.C. board generates the voltages that are required for control, and drives the main shaft motor.  
There are 8 fuses on this P.C. board.  
DC fan motor  
This fan cools the inside of the control box.  
The filters at the air intake slots in the cover and base plate should be cleaned about once a month.  
Conversion transformer (Two types are used depending on the power supply voltage specifications.)  
This breaks down the power supply voltage into the voltages that are required for control operations.  
NF P.C. board (European destinations only)  
This eliminates the electrical interference that is generated by the power supply fan.  
Panel P.C. board  
Secured to the inside of the operation panel. This P.C. board is used for displaying the sewing machine status and for input  
operations.  
Control box  
DC fan motor  
Operation panel  
Panel P.C. board  
NF P.C. board  
Power supply  
motor P.C. board  
Main P.C. board  
Conversion  
transformer  
PMD P.C. board  
4588Q  
5071Q  
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8. ELECTRICAL MECHANISM  
8-3. Description of fuses  
When replacing the fuses, be sure to use the fuses specified below.  
If the components on the P.C. boards are damaged, the fuses may blow again soon even after they have been replaced.  
No.  
F1  
Part name  
Fuse 15AFB  
(Glass tube fuse 15A-250V)  
Parts code  
Symptom when fuse blows  
Sewing machine motor does not operate and [E130] is  
displayed.  
SA3794-001  
Feed mechanism does not operate and [E201] or  
[E211] is displayed.  
Fuse 6AFB  
(Glass tube fuse 6A-250V)  
F2  
F3  
SA3759-001  
SA3759-001  
Work clamp does not operate and [E300] is displayed.  
Thread trimming solenoid or digital tension/tension  
release solenoid does not operate, and thread  
trimming or thread tightening problems occur.  
Communication problem with PMD P.C. board and  
[E403] is displayed.  
Power indicator does not illuminate and nothing  
operates.  
DC fan motor does not operate and [E740] is  
displayed.  
Fuse 6AFB  
(Glass tube fuse 6A-250V)  
Fuse 3AFB  
(Glass tube fuse 3A-250V)  
Fuse 3AFB  
(Glass tube fuse 3A-250V)  
Fuse 3AFB  
(Glass tube fuse 3A-250V)  
Fuse 15AFB  
(Glass tube fuse 15A-250V)  
F4  
F5  
F6  
616167-001  
616167-001  
616167-001  
SA3794-001  
F7  
F8  
Power indicator does not illuminate and nothing  
operates.  
Power supply motor P.C. board  
4590Q  
BAS-311G, BAS-326G  
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8. ELECTRICAL MECHANISM  
8-4. Description of connectors  
A large number of problems are often caused by connectors that are not inserted correctly or which are contacting poorly.  
As a result, check that all connectors are inserted correctly and that the pins and wires are crimped properly before carrying  
out problem diagnosis.  
8-4-1. Connector positions  
Main P.C. board  
5072Q  
BAS-311G, BAS-326G  
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8. ELECTRICAL MECHANISM  
PMD P.C. board  
4592Q  
Power supply motor P.C. board  
4593Q  
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8. ELECTRICAL MECHANISM  
Panel P.C. board  
4594Q  
BAS-311G, BAS-326G  
115  
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8. ELECTRICAL MECHANISM  
8-4-2. Symptoms when there are poor connections  
This divides the functions of the connectors into five sections, but some connectors have more than one function, so be sure  
to refer to the trouble symptoms in other sections too.  
Feed mechanism  
Trouble symptom  
Connector No. and position  
• The feed mechanism operates briefly but does not detect  
the home position correctly.  
• [E200] or [E210] is displayed.  
5241Q  
4708Q  
4709Q  
• Problems with feed mechanism moving forward and back.  
• [E210] or [E211] is displayed.  
• Problems with feed mechanism moving to the left and right.  
• [E200] or [E201] is displayed.  
• Feed motor does not operate.  
• [E200] is displayed.  
4710Q  
Work clamp mechanism  
Trouble symptom  
Connector No. and position  
• The work clamp pulse motor operates, but the home position  
is not detected correctly.  
• [E300] is displayed.  
5242Q  
• The work clamp pulse motor does not operate.  
• [E300] or [E301] is displayed.  
4712Q  
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8. ELECTRICAL MECHANISM  
Thread trimming mechanism  
Trouble symptom  
Connector No. and position  
• Thread trimming does not operate. (No error displayed)  
4713Q  
• Digital tension does not operate. (No error displayed)  
[Digital tension specifications]  
5243Q  
• Analog tension does not operate. (No error displayed)  
[Analog tension specifications]  
4714Q  
Sewing operations  
Trouble symptom  
Connector No. and position  
• Power indicator does not illuminate and sewing machine  
does not operate.  
• Operation is unstable.  
5244Q  
• [E403] is displayed when the power is turned on and the  
sewing machine does not start.  
4717Q  
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8. ELECTRICAL MECHANISM  
Other  
Trouble symptom  
Connector No. and position  
• DC fan motor does not operate.  
• [E740] is displayed.  
5245Q  
• Operation panel display is incorrect.  
• Power indicator does not illuminate.  
• Operation panel keys do not work.  
5246Q  
• Sewing machine does not start when foot switch is  
depressed.  
[Single pedal]  
Work clamp drops when depressed to the 1st step  
Home position is detected and sewing machine starts when  
depressed to the 2nd step  
[2 pedal]  
Work clamp drops when work clamp switch (left) is depressed  
Home position is detected and sewing machine starts when  
start switch (right) is depressed  
5247Q  
5248Q  
5249Q  
• After the power is turned on, [E055] is displayed.  
• After the power is turned on, [E452] is displayed.  
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8. ELECTRICAL MECHANISM  
8-5. Troubleshooting  
8-5-1. Diagnosis flowchart  
Description of symbols  
Manual procedure  
Setting and status  
Switch operation  
Judgment  
Continued on previous/next page  
Power switch OFF  
OFF  
“Problem” symbol in the “8-5-2. Remedy” lists  
5250Q  
BAS-311G, BAS-326G  
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8. ELECTRICAL MECHANISM  
5251Q  
BAS-311G, BAS-326G  
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8. ELECTRICAL MECHANISM  
5252Q  
BAS-311G, BAS-326G  
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8. ELECTRICAL MECHANISM  
5253Q  
BAS-311G, BAS-326G  
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8. ELECTRICAL MECHANISM  
8-5-2. Remedy  
DANGER  
Wait at least 5 minutes after turning off the power switch and disconnecting the power cord from the wall outlet  
before opening the cover of the control box. Touching areas where high voltages are present can result in severe  
injury.  
1. Be sure to note the following cautions when opening the control box to carry out inspections and adjustments.  
Electric shocks  
High voltages can remain in large-capacity capacitors for up to 5 minutes in some circumstances, even when the power  
has been turned off. Accordingly, wait at least 5 minutes after turning off the power before carrying out the following  
operations.  
• Opening and closing the control box  
• Replacing fuses  
• Inserting and disconnecting connectors  
• Measuring resistance values  
• Any other tasks that may involve touching components inside the control box  
Some inspection items require the control box to be open when the power is turned on and voltages are measured.  
At such times, be extremely careful never to touch anywhere other than the specified locations. In addition, note  
that high voltages may remain for up to 5 minutes after the power is turned off.  
Injury  
The fan inside the control box turns while the power is turned on, so be careful not to get anything caught in it.  
Be careful not to touch metallic objects such as the heat sink and cover when connecting and disconnecting connectors  
and making measurements.  
2. When replacing the fuses, be sure to use a fuse with the same material and rating.  
Before carrying out adjustment  
1. With the power turned off, check that all of the connectors are securely connected by referring to “8-4. Description of  
connectors”.  
2. Use the flowchart to check what sort of conditions the problem occurs under (#*).  
3. Carry out the inspections for the problems in the order of the numbers in the “Cause” column.  
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8. ELECTRICAL MECHANISM  
Problem #1 The power indicator does not illuminate when the power is turned on.  
Cause  
Inspection/Remedy/Adjustment  
Replacement if a malfunction  
1. Malfunction of voltage select a. Check if there is a broken wire in the voltage Voltage select harness ***  
harness ***  
select harness.  
(*** indicates voltage  
specifications)  
b. Disconnect the connector at the transformer  
side, turn on the power and then measure the  
voltage at the cord.  
For 200 V specifications  
(The wiring position may vary depending on  
the voltage specifications.)  
OK if same as wall outlet voltage  
Voltage  
Pin No.  
specifications  
100V  
110V  
120V  
200V  
220V  
240V  
H220V  
380V  
400V  
6-8  
5-8  
4-8  
3-8  
2-8  
2-7  
3-6  
2-3  
1-3  
4876Q  
2. Malfunction of transformer  
Transformer  
• For 100V, 200V, 220 V specifications  
1) OK if there is continuity between pins  
1-8, 2-8, 3-8, 4-8, 5-8 and 6-8 of the  
8-pin connector coming out from the  
transformer. [Fig. A]  
100V, 200V, 220 V specifications  
2) OK if there is continuity between pins  
1-2, 3-4 and 5-6 of the 6-pin connector  
coming out from the transformer.  
[Fig. C]  
3) OK if there is continuity between pins  
1-2 and 4-5 of the 5-pin connector  
coming out from the transformer.  
[Fig. D]  
4877Q  
380V, 400V specifications  
• For 380V, 400V specifications  
1) OK if there is continuity between pins  
1-3, 2-3 and 3-6 of the 6-pin connector  
coming out from the transformer.  
[Fig. B]  
2) OK if there is continuity between pins  
1-2, 3-4 and 5-6 of the 6-pin connector  
coming out from the transformer.  
[Fig. C]  
3) OK if there is continuity between pins  
1-2 and 4-5 of the 5-pin connector  
coming out from the transformer.  
[Fig. D]  
4878Q  
4879Q  
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8. ELECTRICAL MECHANISM  
Problem #1 The power indicator does not illuminate when the power is turned on.  
Cause  
Inspection/Remedy/Adjustment  
Disconnect connector P9 (ACIN) on the power  
supply motor P.C. board from the circuit board,  
turn on the power, and then measure the voltage  
between pins 3-4 of the cord-side connector.  
OK if same as wall outlet voltage  
Replacement if a malfunction  
3. Malfunction of power cord  
After inspecting, turn off the power and insert  
connector P9.  
4880Q  
4. Blown fuse  
Remove fuses F7 and F8 and check the Glass tube fuse  
continuity.  
15A-250V  
OK if continuity  
(If there is no continuity, replace the fuse and  
then carry out the inspections in 5. )  
5. Malfunction of power supply Disconnect connector P17 (M-MOTOR) of the Power supply motor P.C.  
motor P.C. board  
main P.C. board, turn on the power, and then board  
measure the voltages between the pins at the  
cord-side connector.  
OK if the voltages are as shown in the table  
below.  
Pin Nos.  
Normal  
voltage  
+5V  
+5V  
+24V  
+24V  
+ side  
− side  
1
2
6
7
3
4
5
5
After measuring, turn off the power, wait 5  
minutes or more and then insert P14.  
5085Q  
6. Malfunction of main P.C. board  
With connector P17 (M-MOTOR) inserted into Main P.C. board  
the main P.C. board, turn on the power and then  
measure the voltages between the pins at the  
cord-side connector.  
OK if the voltages are as shown in the table  
below.  
Pin Nos.  
Normal  
voltage  
+5V  
+5V  
+24V  
+24V  
+ side  
− side  
1
2
6
7
3
4
5
5
After measuring, turn off the power.  
5085Q  
7. Malfunction of panel P.C. board  
Check that connector P1 (PANEL) is inserted Panel P.C. board  
into the main P.C. board, and that connector Panel harness  
CN2 (MAIN) is inserted into the panel P.C.  
board.  
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8. ELECTRICAL MECHANISM  
Problem #2 When the power is turned on, nothing is displayed in the PROGRAM No. display or the menu display.  
Cause  
Inspection/Remedy/Adjustment  
Replacement if a malfunction  
Control program does not operate.  
Insert a CF card containing the control program, Main P.C. board  
turn on the power switch and update the program  
version. (Refer to “3-11. Updating the control  
program”.)  
Problem #3 When the power is turned on, an error code is displayed.  
Cause Inspection/Remedy/Adjustment  
1. If [E025] or [E035] is displayed, 1) Check if the foot switch is still depressed.  
Replacement if a malfunction  
Treadle unit  
the foot switch is still depressed.  
2) Check if there is a harness short-circuit.  
3) Check that connector P6 (FOOT) is inserted  
into the main P.C. board.  
Two-pedal foot switch  
2. If [E055] is displayed, there is a 1) Check that the machine head switch is OFF.  
malfunction of the machine head 2) Check if there is a harness short-circuit.  
Machine head switch  
switch.  
3) Check that connector P9 (HEAD-SW) is  
inserted into the main P.C. board.  
3. If [E065] is displayed, one of the Check that connector P1 (PANEL) is inserted Panel P.C. board  
keys on the operation panel is into the main P.C. board, and that connector Panel harness  
still depressed.  
CN2 (MAIN) is inserted into the panel P.C.  
board.  
4. If [E403] is displayed, there is a 1) Check that connector P17 (M-MOTOR) is Harness  
poor connection between the  
main P.C. board and the PMD  
P.C. board.  
inserted into the main P.C. board, and that Power supply motor P.C.  
connector P6 (MAIN) is inserted into the board  
power supply motor P.C. board.  
Main P.C. board  
2) Check if there is a harness short-circuit.  
5. If [E401] is displayed, there is a 1) Check that connector P1 (MAIN) is inserted Main P.C. board  
poor connection between the into the power supply motor P.C. board.  
main P.C. board and the power 2) Check if there is a harness short-circuit.  
supply motor P.C. board.  
6. If [E450] or [E452] is displayed, 1) Check that connector P3 (HEAD-M) is Machine head memory  
the machine head memory  
cannot be verified.  
inserted into the power supply motor P.C.  
board.  
2) Check if there is a harness short-circuit.  
7. If [E700] is displayed, there is an 1) Check that the power supply voltage at the  
abnormal rise in the power  
supply voltage.  
wall outlet is within the range of the  
specification voltage +/- 10%.  
2) Refer to check items #1-2 and #1-3.  
8. If [E705] is displayed, there is an 1) Check that the power supply voltage at the  
abnormal drop in the power  
supply voltage.  
wall outlet is within the range of the  
specification voltage +/- 10%.  
2) Refer to check items #1-2 and #1-3.  
9. If [E740] is displayed, there is a 1) Check if there are any thread scraps blocking DC fan motor assembly  
malfunction of the cooling fan.  
the cooling fan.  
2) Check that connector P22 (FAN) is inserted  
into the main P.C. board.  
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8. ELECTRICAL MECHANISM  
Problem #4 Panel keys do not work.  
Cause  
Inspection/Remedy/Adjustment  
Replacement if a malfunction  
Malfunction of panel P.C. board  
Check that connector P1 (PANEL) is inserted Panel P.C. board  
into the main P.C. board, and that connector Panel harness  
CN2 (MAIN) is inserted into the panel P.C.  
board.  
Problem #5 The work clamp does not return to the home position when the foot switch is depressed.  
Cause  
Inspection/Remedy/Adjustment  
Replacement if a malfunction  
1. Malfunction of treadle unit  
With connector P6 (FOOT) inserted into the main Treadle unit  
P.C. board, turn on the power and then measure  
the voltages between pins 2-3 at the cord-side  
connector. (No. 2 +, No. 3 −)  
OK if the voltage is approximately 2 V at neutral  
and approximately 4 V when the foot switch is  
depressed as far as it will go.  
5086Q  
2. Malfunction of two-pedal foot Disconnect connector P6 (FOOT) from the main Foot switch  
switch  
P.C. board, and check the continuity between Foot switch cord assembly  
pins 5-6, 7-8 and 8-9 at the cord-side connector.  
OK if normally ∞ Ω, and 0 Ω when the foot switch  
is depressed.  
Work clamp  
(Second  
Start  
Work  
clamp  
position)  
5087Q  
Problem #6 Home position is incorrect.  
Cause  
Inspection/Remedy/Adjustment  
Replacement if a malfunction  
Incorrect home position adjustment  
Switch to home position adjustment mode, and  
adjust the position of the home position dog.  
(Refer to “7-20. Adjusting the home position”.)  
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8. ELECTRICAL MECHANISM  
Problem #7 When the foot switch is depressed, an error code is displayed.  
Cause  
Inspection/Remedy/Adjustment  
Replacement if a malfunction  
1. If the X feed moves slightly and 1) Check that connector P20 (X-ENC) is Pulse motor X assembly  
then [E200] is displayed, there is  
a malfunction of the encoder.  
inserted into the main P.C. board.  
2) Check the encoder input while referring to  
“2-8. Input checking method”.  
2. If the X feed moves and then 1) Check that connector P8 (SENSOR1) is X home position sensor  
[E200] is displayed, there is a inserted into the main P.C. board.  
malfunction of the  
position sensor.  
X
home 2) Check the X home position sensor input  
while referring to “2-8. Input checking  
method”.  
3) If a metallic object is brought close to the X  
home position sensor and the LED inside the  
sensor does not illuminate, there is  
malfunction of the sensor.  
a
4) If it illuminates, the home position dog is  
incorrectly adjusted.  
Switch to home position adjustment mode,  
and adjust the position of the home position  
dog. (Refer to “7-20. Adjusting the home  
position”.)  
3. If the feed mechanism does not 1) Disconnect connector P10 (XPM) from the Pulse motor assembly  
move and [E200] is displayed,  
there is a malfunction of the  
pulse motor or cord.  
PMD P.C. board, and measure the resistance  
between pins 1-2 and 3-4 at the cord-side  
connector.  
OK if 2−3 Ω  
After measuring, insert P10.  
2) If 1) is OK, there is a malfunction of the PMD  
P.C. board.  
PMD P.C. board  
4885Q  
Problem #8 When the foot switch is depressed, an error code is displayed.  
Cause Inspection/Remedy/Adjustment  
Replacement if a malfunction  
1. If the Y feed moves slightly and 1) Check that connector P4 (Y-ENC) is inserted Pulse motor Y assembly  
then [E210] is displayed, there is  
a malfunction of the encoder.  
into the main P.C. board.  
2) Check the encoder input while referring to  
“2-8. Input checking method”.  
2. If the Y feed moves and then 1) Check that connector P8 (SENSOR1) is Y home position sensor  
[E210] is displayed, there is a inserted into the main P.C. board.  
malfunction of the  
position sensor.  
Y
home 2) Check the Y home position sensor input  
while referring to “2-8. Input checking  
method”.  
3) If a metallic object is brought close to the Y  
home position sensor and the LED inside the  
sensor does not illuminate, there is  
malfunction of the sensor.  
a
4) If it illuminates, the home position dog is  
incorrectly adjusted.  
Switch to home position adjustment mode,  
and adjust the position of the home position  
dog. (Refer to “7-20. Adjusting the home  
position”.)  
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8. ELECTRICAL MECHANISM  
Problem #8 When the foot switch is depressed, an error code is displayed.  
Cause Inspection/Remedy/Adjustment  
Replacement if a malfunction  
3. If the feed mechanism does not 1) Disconnect connector P8 (YPM) from the Pulse motor Y assembly  
move and [E210] is displayed,  
there is a malfunction of the  
pulse motor or cord.  
PMD P.C. board, and measure the resistance  
between pins 1-2 and 3-4 at the cord-side  
connector.  
OK if 2-3 Ω  
After measuring, insert P8.  
2) If 1) is OK, there is a malfunction of the PMD  
P.C. board.  
PMD P.C. board  
4886Q  
Problem #9 When the foot switch is depressed, an error code is displayed.  
Cause Inspection/Remedy/Adjustment  
Replacement if a malfunction  
1. If the work clamp does not Remove fuse F2 from the power supply motor Fuse  
operate and [E300] is displayed, P.C. board and check the continuity. 6A-250V  
there is a blown fuse.  
OK if continuity  
(If there is no continuity, carry out the inspections  
in 2.)  
2. If the work clamp does not 1) Disconnect connector P9 (POWER1) from PMD P.C. board or power  
operate and [E300] is displayed,  
there is a malfunction of the  
PMD P.C. board or of the power  
supply motor P.C. board.  
the PMD P.C. board and measure the supply motor P.C. board  
resistance between pins 1-2 at connector P9.  
OK if ∞ Ω; if 0 Ω, there is a malfunction of the  
PMD P.C. board.  
2) Measure the resistance between the fuse F2  
terminal that is close to P6 (MAIN) and pin 2  
of connector P7 (PMD) on the power supply  
motor P.C. board. (D10 check)  
OK if ∞ Ω  
3) Disconnect connector P9 (POWER1) from  
the PMD P.C. board, and then measure the  
voltage between pins 1-2 of the cord-side  
connector.  
OK if approx. +100 V  
After measuring, turn off the power, wait 5  
minutes or more and then insert P9.  
4) Disconnect connector P2 (POWER2) from  
the PMD P.C. board, and then measure the  
voltage between pins 1-2 of the cord-side  
connector.  
OK if approx. +16 V  
After measuring, turn off the power, wait 5  
minutes or more and then insert P2.  
5) Check that connector P1 (MAIN) is inserted  
into the PMD P.C. board.  
4884Q  
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8. ELECTRICAL MECHANISM  
Problem #9 When the foot switch is depressed, an error code is displayed.  
Cause  
3. If the work clamp moves slightly 1) Check that connector P5 (P-ENC) is inserted Pulse motor P assembly  
and then [E300] is displayed, into the main P.C. board.  
there is a malfunction of the 2) Check the encoder input while referring to  
encoder. “2-8. Input checking method”.  
4. If the work clamp operates and 1) Check that connector P8 (SENSOR1) is Work clamp home position  
[E300] is displayed, there is a inserted into the main P.C. board. sensor  
malfunction of the work clamp 2) Check the work clamp home position sensor  
Inspection/Remedy/Adjustment  
Replacement if a malfunction  
home position sensor.  
input while referring to “2-8. Input checking  
method”.  
3) If a metallic object is brought close to the  
work clamp home position sensor and the  
LED inside the sensor does not illuminate,  
there is a malfunction of the sensor.  
4) If it illuminates, the home position dog is  
incorrectly adjusted.  
Switch to home position adjustment mode,  
and adjust the position of the home position  
dog. (Refer to “7-20. Adjusting the home  
position”.)  
5. If the work clamp does not move 1) Disconnect connector P3 (PPM) from the Pulse motor P assembly  
and [E300] is displayed, there is  
a malfunction of the pulse motor  
or cord.  
PMD P.C. board, and measure the resistance  
between pins 1-2 and 3-4 at the cord-side  
connector.  
OK if 2-3 Ω  
After measuring, insert P3.  
2) If 1) is OK, there is a malfunction of the PMD  
P.C. board.  
PMD P.C. board  
4888Q  
Problem #10 CF media indicator does not illuminate.  
Cause  
Inspection/Remedy/Adjustment  
Replacement if a malfunction  
1. Incorrectly inserted  
1) Check the insertion direction of the CF card.  
(The side with the projection should be at the  
left.)  
2) Check the insertion of the CF card.  
Check the format of the CF card.  
(Use 16-sector formatting.)  
Use a computer to check whether the contents of  
the CF card can be read.  
2. CF card incorrectly formatted.  
3. Malfunction of CF card  
Problem #11 Work clamp does not rise.  
Cause  
Inspection/Remedy/Adjustment  
Replacement if a malfunction  
1. Incorrect work clamp home Adjust the home position while referring to “7-20.  
position adjustment  
Adjusting the home position”.  
2. Incorrect mechanism adjustment  
Check if the movement of the work clamp arm is Work clamp arm assembly  
stiff.  
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8. ELECTRICAL MECHANISM  
Problem #12 Work clamp does not drop.  
Cause  
Inspection/Remedy/Adjustment  
Replacement if a malfunction  
1. Incorrect work clamp home 1) Adjust the home position while referring to  
position adjustment  
“7-20. Adjusting the home position”.  
2) Check if the thread wiper or work clamp are  
touching something else.  
2. Incorrect mechanism adjustment  
Check if the movement of the work clamp arm is Work clamp arm assembly  
stiff.  
Problem #13 TEST indicator does not illuminate when the TEST key is pressed.  
Cause  
Inspection/Remedy/Adjustment  
Replacement if a malfunction  
1. Malfunction of panel P.C. board  
Check that connector P1 (PANEL) is inserted Panel P.C. board  
into the main P.C. board, and that connector Panel harness  
CN2 (MAIN) is inserted into the panel P.C.  
board.  
2. Malfunction of main P.C. board  
Replace the main P.C. board.  
Main P.C. board  
Problem #14 The feed mechanism does not move one stitch at a time during test feed.  
Cause Inspection/Remedy/Adjustment  
Replacement if a malfunction  
1. Malfunction of foot switch or Refer to inspection #5.  
cord  
2. Incorrect memory switch setting  
1) Set memory switch No. 200 to OFF.  
2) Set memory switch No. 252 to OFF.  
Problem #15 Feed mechanism does not move fast during test feed.  
Cause  
Inspection/Remedy/Adjustment  
Refer to inspection #5.  
Replacement if a malfunction  
Replacement if a malfunction  
Replacement if a malfunction  
Malfunction of foot switch or cord  
Problem #16 Feed mechanism does not follow program during test feed.  
Cause  
Inspection/Remedy/Adjustment  
Refer to inspection #5.  
Malfunction of foot switch or cord  
Problem #17 Intermittent presser foot does not drop during sewing.  
Cause Inspection/Remedy/Adjustment  
1. If the presser foot does not Remove fuse F2 from the power supply motor Fuse  
operate and [E300] is displayed, P.C. board and check the continuity. 6A-250V  
there is a blown fuse.  
OK if continuity  
(If there is no continuity, carry out the inspections  
in 2.)  
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8. ELECTRICAL MECHANISM  
Problem #17 Intermittent presser foot does not drop during sewing.  
Cause  
Inspection/Remedy/Adjustment  
Replacement if a malfunction  
2. If the presser foot does not 1) Disconnect connector P9 (POWER1) from PMD P.C. board, or power  
operate and [E300] is displayed,  
there is a malfunction of the  
PMD P.C. board or of the power  
supply motor P.C. board.  
the PMD P.C. board and measure the supply motor P.C. board  
resistance between pins 1-2 at connector P9.  
OK if ∞ Ω; if 0 Ω, there is a malfunction of  
the PMD P.C. board.  
2) Measure the resistance between the fuse F2  
terminal that is close to P6 (MAIN) and pin 2  
of connector P7 (PMD) on the power supply  
motor P.C. board. (D10 check)  
OK if ∞ Ω  
3) Disconnect connector P9 (POWER1) from  
the PMD P.C. board, and then measure the  
voltage between pins 1-2 of the cord-side  
connector.  
OK if approx. +100 V  
After measuring, turn off the power, wait 5  
minutes or more and then insert P9.  
4) Disconnect connector P2 (POWER2) from  
the PMD P.C. board, and then measure the  
voltage between pins 1-2 of the cord-side  
connector.  
OK if approx. +16 V  
After measuring, turn off the power, wait 5  
minutes or more and then insert P2.  
5) Check that connector P1 (MAIN) is inserted  
into the PMD P.C. board.  
4884Q  
3. If the presser foot moves slightly 1) Check that connector P5 (P-ENC) is inserted Pulse motor P assembly  
and then [E300] is displayed, into the main P.C. board.  
there is a malfunction of the 2) Check the encoder input while referring to  
encoder. “2-8. Input checking method”.  
4. If the presser foot operates and 1) Check that connector P8 (SENSOR1) is Work clamp home position  
[E300] is displayed, there is a inserted into the main P.C. board. sensor  
malfunction of the work clamp 2) Check the work clamp home position sensor  
home position sensor.  
input while referring to “2-8. Input checking  
method”.  
3) If a metallic object is brought close to the  
work clamp home position sensor and the  
LED inside the sensor does not illuminate,  
there is a malfunction of the sensor.  
4) If it illuminates, the home position dog is  
incorrectly adjusted.  
Switch to home position adjustment mode,  
and adjust the position of the home position  
dog. Refer to “7-20. Adjusting the home  
position”.  
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8. ELECTRICAL MECHANISM  
Problem #17 Intermittent presser foot does not drop during sewing.  
Cause Inspection/Remedy/Adjustment  
Replacement if a malfunction  
5. If the presser foot does not 1) Disconnect connector P3 (PPM) from the Pulse motor P assembly  
move and [E300] is displayed,  
there is a malfunction of the  
pulse motor or cord.  
PMD P.C. board, and measure the resistance  
between pins 1-2 and 3-4 at the cord-side  
connector.  
OK if 2-3 Ω  
After measuring, insert P3.  
2) If 1) is OK, there is a malfunction of the PMD  
P.C. board.  
PMD P.C. board  
4888Q  
Problem # 18 Sewing machine does not operate during sewing and [E120] is displayed.  
Cause Inspection/Remedy/Adjustment  
Replacement if a malfunction  
1. Malfunction of sewing machine Check connector P4 (UVW) of the power supply Motor cable  
motor cord  
motor P.C. board and the sewing machine motor  
connector.  
2. If the fuse (F1) on the power 1) If the fuse (F1) is blown, check the resistance Power supply motor P.C.  
supply motor P.C. board is  
blown, there is a malfunction of  
the main P.C. board.  
values between all pins of the connector P4 board  
(UVW) and the pins of the fuse (∞ Ω) and  
replace the fuse.  
2) If the fuse blows again, replace the power  
supply motor P.C. board.  
3. Sewing machine motor overheats 1) Turn off the power and let the sewing Motor cable  
and the thermostat inside the machine stand for 30 minutes.  
motor operates when the sewing 2) Turn the power back on; OK if operation is  
machine is operated at short  
cycle.  
normal.  
Avoid repeated sewing of sewing data that is  
less than 15 stitches.  
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8. ELECTRICAL MECHANISM  
Problem #19 An error code is displayed after the sewing machine operates.  
Cause  
Inspection/Remedy/Adjustment  
Replacement if a malfunction  
1. If [E120], [E121] or [E130] is 1) Check that connector P5 (SYNC) is Motor assembly CCD-430D  
displayed after the sewing  
machine operates, there is a  
malfunction of the synchronizer,  
connected to the power supply motor P.C.  
board and that the synchronizer is  
connected.  
interference is causing operating 2) Check the synchronizer input while referring  
problems,  
machine is incorrectly adjusted.  
or  
the  
sewing  
to “2-8. Input checking method”.  
OK if the signal turns on and off.  
3) Turn the pulley by hand and check that it  
turns smoothly.  
4) Check that connector P17 (M_MOTOR) is  
connected to the main P.C. board and that  
connector P6 (MAIN) is connected to the  
power supply motor P.C. board.  
5) Check the harness between connector P17  
(M_MOTOR) of the main P.C. board and  
connector P6 (MAIN) of the power supply  
motor P.C. board.  
6) Check that the ground wire is connected to a  
secure ground and that there is no equipment  
nearby that is generating strong electrical  
interference.  
7) If [E121] is displayed when the sewing  
machine stops:  
• Check if the thread trimming solenoid is  
operating.  
• Adjust the thread trimming mechanism.  
2. If [E150] is displayed after the 1) Turn off the power and let the sewing  
sewing machine operates, the  
motor is abnormally overheating.  
machine stand for 30 minutes.  
2) Turn the power back on; OK if operation is  
normal.  
3) If the area around the motor is not hot, carry  
out the steps for [E121].  
Avoid repeated sewing of sewing data that is  
less than 15 stitches.  
Problem #20 Sewing is incorrect.  
Cause  
Inspection/Remedy/Adjustment  
Refer to inspection #19.  
Replacement if a malfunction  
1. Malfunction of synchronizer  
2. If uneven seams occur, there is 1) Refer to inspection #7-3.  
a malfunction of the pulse motor 2) If uneven seams are occurring because the  
or the mechanism is incorrectly  
adjusted.  
work clamp pressure is too weak, adjust the  
work clamp lift amount while referring to  
“7-14. Adjusting the work clamp lift amount”.  
3) If there is play in the feed mechanism, adjust  
the feed mechanism.  
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8. ELECTRICAL MECHANISM  
Problem #21 Thread is not trimmed.  
Cause  
Inspection/Remedy/Adjustment  
Adjust the thread trimming mechanism while  
refer to “7-17. Adjusting the thread trimming cam  
position”.  
Replacement if a malfunction  
1. Incorrect mechanism adjustment  
(If it is clear that the thread trimming mechanism  
is not operating, carry out inspections 2. and 3.  
below.)  
2. Poor connector contact  
Check that connector P1 (MAIN) is inserted into  
the PMD P.C. board.  
3. Malfunction of thread trimming Disconnect connector P6 (SOL1) from the PMD Thread trimming solenoid  
solenoid  
P.C. board, and measure the resistance between  
pins 3-6 of the cord-side connector.  
OK if 6 − 8 Ω  
4889Q  
4. Malfunction of tension release Disconnect connector P7 (SOL2) from the PMD Tension release solenoid/  
solenoid/digital tension  
P.C. board, and measure the resistance between digital tension solenoid  
pins 1-2 of the cord-side connector.  
OK if 6 − 8 Ω  
4890Q  
5. Malfunction of PMD P.C. board  
1) With connector P6 (SOL1) connected to the PMD P.C. board  
PMD P.C. board, turn on the power and carry  
out sewing, and measure the voltage  
between pins 3-6 of connector P6 (SOL1).  
OK if voltage is output momentarily at the  
sewing end.  
2) With connector P7 (SOL2) connected to the  
PMD P.C. board, turn on the power and carry  
out sewing, and measure the voltage  
between pins 1-2 of connector P7 (SOL2).  
OK if voltage is output momentarily at the  
sewing end.  
4891Q  
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8. ELECTRICAL MECHANISM  
Problem #22 Thread wiper does not operate.  
Cause  
Inspection/Remedy/Adjustment  
Replacement if a malfunction  
1. Incorrect mechanism adjustment Adjust the thread wiper while referring to “7-11.  
Adjusting the thread wiper”.  
(If it is clear that the thread wiper mechanism is  
not operating, carry out inspections 2. and 3.  
below.)  
2. Poor connector contact  
Check that connector P1 (MAIN) is inserted into  
the PMD P.C. board.  
3. Malfunction of thread wiper Disconnect connector P6 (SOL1) from the PMD Thread wiper solenoid  
solenoid  
P.C. board, and measure the resistance between  
pins 2-5 of the cord-side connector.  
OK if approximately 4 Ω  
5088Q  
4. Malfunction of PMD P.C. board  
With connector P6 (SOL1) connected to the PMD P.C. board  
PMD P.C. board, turn on the power and carry out  
sewing, and measure the voltage between pins  
2-5 of connector P6 (SOL1).  
OK if voltage is output momentarily at the sewing  
end.  
5089Q  
Problem #23 Needle does not stop in the up position ([E110] is displayed.)  
Cause  
1. Incorrect adjustment  
Inspection/Remedy/Adjustment  
Adjust while referring to “7-21. Adjusting the  
needle up stop home position” and “7-22.  
Adjusting the needle up stop position”.  
Refer to inspection #19.  
Replacement if a malfunction  
2. Malfunction of synchronizer  
3. Malfunction of cord  
Refer to inspection #18.  
4. Malfunction of power supply With connector P2 (POWER2) connected to the Power supply motor P.C.  
motor P.C. board  
board  
PMD P.C. board, measure the voltage at the cord.  
OK if approximately 30 V DC between pins 3-4  
4892Q  
5. Malfunction of main P.C. board  
6. Malfunction of motor  
Main P.C. board  
Motor  
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9. TABLE OF ERROR CODES  
9. TABLE OF ERROR CODES  
DANGER  
Wait at least 5 minutes after turning off the power switch and disconnecting the power cord from the wall outlet  
before opening the cover of the control box. Touching areas where high voltages are present can result in severe  
injury.  
If a malfunction should occur with the sewing machine, a buzzer will sound and an error code will appear in the display  
window. Follow the remedy procedure to eliminate the cause of the problem.  
Switch-related errors  
Cause and remedy  
Code  
Stop switch was pressed. Press the RESET key to clear the error.  
E010  
Stop switch was pressed. Press the RESET key to clear the error.  
E011  
E015  
E016  
Press the  
key to move the feed mechanism so that you can continue sewing.  
The stop switch was still being pressed, or there is a problem with the stop switch connection.  
Turn off the power, and then check that connector P13 on the main P.C. board is properly connected.  
Problem with the stop switch connection.  
Turn off the power, and then check that connector P13 on the main P.C. board is properly connected.  
Foot switch is depressed to the 2nd step. (If using a two-pedal foot switch, the power was turned on while the  
start switch was still depressed, or the start switch was pressed without the work clamp being lowered.)  
Turn off the power and check the foot switch.  
E025  
Foot switch is depressed to the 1st step. (Work clamp switch if using a two-pedal foot switch)  
Turn off the power and check the foot switch.  
Work clamp motions are not set correctly.  
E035  
E036  
Set memory switch No. 050 or 003 correctly in accordance with the type of foot switch being used.  
Machine head tilting was detected after the power was turned on.  
Turn off the power, and then return the machine head to its original position.  
Check that connector P9 on the main P.C. board is properly connected.  
Machine head tilting was detected while the sewing machine was operating.  
Turn off the power, and then check that connector P9 on the main P.C. board is properly connected.  
Machine head tilting was detected when the power was turned on.  
Turn off the power, and then return the machine head to its original position.  
Check that connector P9 on the main P.C. board is properly connected.  
An operation panel key was still being pressed when the power was turned on, or key is faulty.  
Turn off the power and check the operation panel.  
E050  
E051  
E055  
E065  
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9. TABLE OF ERROR CODES  
Upper shaft motor-related errors  
Cause and remedy  
Code  
Needle up stop position error.  
E110  
Turn the machine pulley until the point where the error display disappears.  
Upper shaft did not stop at the needle up stop position when the sewing machine stopped.  
Turn the machine pulley until the point where the error display disappears.  
Needle drop signal could not be detected.  
Turn off the power, and then check the synchronizer connection.  
Thread trimming was not completed.  
Turn off the power, and then check if the cutting edges of the fixed knife and movable knife are damaged or worn.  
Sewing machine motor stopped due to a problem, or synchronizer is faulty.  
Turn off the power, and then turn the machine pulley and check if the sewing machine has locked up.  
Check that connectors P4 and P5 on the power supply motor P.C. board are properly connected.  
Check if the fuse (F1) is blown.  
E111  
E120  
E121  
E130  
Synchronizer is faulty.  
Turn off the power, and then check that connector P5 on the power supply motor P. C. board is properly  
connected.  
Problem detected with sewing machine motor operation.  
Turn off the power, and then check that connector P4 on the power supply motor P. C. board is properly  
connected.  
Sewing machine motor stopping position is incorrect.  
E131  
E132  
E133  
Turn off the power, and then check that connector P5 on the power supply motor P. C. board is properly  
connected.  
Sewing machine motor is overheating, or temperature sensor is faulty.  
Turn off the power, and then check the sewing machine motor.  
(When sewing data with a small number of stitches (15 stitches or less) is sewn repeatedly (short cycle  
operation), the upper shaft motor may overheat and the “E150” error code may be generated.)  
E150  
Feed mechanism-related errors  
Cause and remedy  
X-feed motor home position cannot be detected.  
Code  
Problem with X -feed motor or poor X home position sensor connection.  
Turn off the power, and then check that connector P10 on the PMD P.C. board and connector P20 on the main  
P.C. board are properly connected.  
E200  
X-feed motor stopped due to a problem.  
Turn off the power, and then check if there are any problems in the X-feed direction.  
Check if the fuse (F2) is blown.  
Problem with X-feed motor or Y-feed motor home position adjustment data.  
Re-adjust the home position.  
E201  
E202  
Y-feed motor home position cannot be detected.  
Problem with Y-feed motor or poor Y home position sensor connection.  
Turn off the power, and then check that connector P8 on the PMD P.C. board and connector P4 on the main P.C.  
board are properly connected.  
Y-feed motor stopped due to a problem.  
Turn off the power, and then check if there are any problems in the Y-feed direction.  
Check if the fuse (F2) is blown.  
E210  
E211  
Work clamp-related errors  
Cause and remedy  
Work clamp home position cannot be detected.  
Code  
Problem with work clamp motor or poor work clamp home position sensor connection.  
Turn off the power, and then check that connector P3 on the PMD P.C. board and connector P5 on the main P.C.  
board are properly connected.  
E300  
Check if the fuse (F2) is blown.  
Work clamp raised or lowered position cannot be detected.  
Turn off the power, and then check if there are any problems in the work clamp vertical direction.  
Problem with work clamp motor home position adjustment data.  
Re-adjust the home position.  
E301  
E303  
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9. TABLE OF ERROR CODES  
Communication and memory-related errors  
Cause and remedy  
Code  
Connection communication error with power supply motor P. C. board detected when power was turned on.  
Turn off the power, and then check that connector P6 on the power supply motor P.C. board and connector P17  
on the main P.C. board are properly connected.  
E401  
Communication error with programmer detected when power is turned on.  
Turn off the power, and then check that connector P7 on the main P.C. board is properly connected.  
Connection error with PMD P. C. board detected when power was turned on.  
Turn off the power, and then check that connector P1 on the PMD P.C. board is properly connected.  
Communication error with main P. C. board detected.  
E402  
E403  
E410  
Turn off the power, and then turn it back on again.  
Communication error with power supply motor P. C. board detected.  
Turn off the power, and then turn it back on again.  
Check if the fuse (F4) is blown.  
Communication error with programmer detected.  
Turn off the power, and then turn it back on again.  
E411  
E412  
Communication error with PMD P. C. board detected.  
Turn off the power, and then turn it back on again.  
No CF card is inserted.  
Program contents are incorrect and cannot be used, or no data.  
Check that the CF card or floppy disk contains data with this program number.  
Error occurred while reading the CF card or floppy disk.  
Check the data on the CF card or floppy disk.  
Insufficient free space on CF card.  
Use a different CF card.  
E413  
E420  
E421  
E422  
E424  
Error occurred while writing to the CF card or floppy disk.  
Use the specified type of CF card.  
Check if the floppy disk is write-protected and if it has enough free space.  
R/W key has not been pressed.  
Press the R/W key to load the data.  
E425  
E426  
E427  
CF card or floppy disk does not contain any data with this program number.  
Check the program number.  
Data that has already been loaded into internal memory can be used without having to press the R/W key again.  
Data cannot be backed up to main P.C. board.  
Turn off the power, and then turn it back on again.  
Data memory error on main P.C. board.  
Turn off the power, and then turn it back on again.  
Model selection cannot be read from the machine head memory.  
Turn off the power and check that connector P3 on the power supply motor P.C. board is properly connected.  
Data cannot be backed up to machine head memory.  
Turn off the power, and then turn it back on again.  
Machine head memory is not connected.  
Turn off the power and check that connector P3 on the power supply motor P.C. board is properly connected.  
E430  
E440  
E450  
E451  
E452  
Internal memory is full and copying is not possible.  
Clear the sewing data, or change the settings so that sewing data is not copied to internal memory when it is  
loaded (memory switch No. 466 = ON).  
E474  
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9. TABLE OF ERROR CODES  
Data editing-related errors  
Cause and remedy  
Code  
The enlargement ratio setting caused the sewing data to extend outside the sewing area.  
Set the enlargement ratio again.  
Sewing data that exceeds the sewing machine's sewing area was loaded.  
Check the size of the sewing data.  
The enlargement ratio caused the data pitch to exceed the maximum pitch of 12.7 mm.  
Set the enlargement ratio again.  
Invalid code in sewing data.  
E500  
E501  
E502  
E510  
Reload the data from the CF card or floppy disk.  
No end code has been input into sewing data.  
Input an end code, or change the program number.  
Number of stitches exceeds allowed maximum.  
Extended option output number already exists. Change the extended option output number.  
If not using the extended option output, initialize the data to clear the extended option output data.  
Changing program number is prohibited.  
E511  
E512  
E520  
E530  
Device-related errors  
Cause and remedy  
Code  
Upper thread breakage occurred.  
Thread the upper thread. Resewing is then possible.  
E600  
Thread nipper home position error.  
Turn off the power, and then clean underneath the needle plate to remove any dust and thread scraps.  
Check that connector P10 on the main P.C. board is properly connected.  
Thread nipper retract position error  
E690  
Check if the upper thread trailing length is too long.  
Turn off the power, and then clean underneath the needle plate to remove any dust and thread scraps.  
Check that connector P10 on the main P.C. board is properly connected.  
E691  
P.C. board-related errors  
Cause and remedy  
Code  
Abnormal rise in power supply voltage.  
Turn off the power and check the input voltage.  
Abnormal rise in sewing machine motor drive voltage.  
Turn off the power, and then check the voltage.  
Abnormal drop in power supply voltage.  
Turn off the power and check the input voltage.  
Abnormal current detected in sewing machine motor.  
Turn off the power, and then check if there are any problems with the sewing machine.  
Abnormal current detected in X-feed motor.  
Turn off the power, and then check if there are any problems in the X-feed direction.  
Abnormal current detected in Y-feed motor.  
E700  
E701  
E705  
E710  
E711  
E712  
Turn off the power, and then check if there are any problems in the Y-feed direction.  
Abnormal current detected in work clamp motor.  
Turn off the power, and then check if there are any problems with the X-feed mechanism, Y-feed mechanism or  
work clamp lifter.  
External error input (AIRSW) detected.  
E713  
E730  
Turn off the power, and then check the air pressure.  
Cooling fan does not operate.  
Turn off the power, and then check if the cooling fan is blocked with scraps of thread.  
Check that connector P22 on the main P.C. board is properly connected.  
Check if the fuse (F6) is blown.  
E740  
If an error code that is not listed above appears, contact the place of purchase.  
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10. TROUBLESHOOTING  
10. TROUBLESHOOTING  
• Please check the following points before calling for repairs or service.  
• If the following remedies do not fix the problem, turn off the power switch and consult a qualified technician or the place of  
purchase.  
CAUTION  
Turn off the power switch and disconnect the power cord before carrying out troubleshooting.  
If the foot switch is depressed by mistake, the sewing machine might start operating and injury could result.  
Problem  
Cause  
Remedy  
Reference  
Work clamp does not  
lift.  
Apply a suitable amount of grease to the  
sliding parts of the work clamp.  
Work clamp moves stiffly.  
Air tube of presser lifter cylinder is bent Straighten the bend in the tube or  
or damaged (Pneumatic specifications).  
replace the tube.  
Work clamp does not  
drop.  
Apply a suitable amount of grease to the  
sliding parts of the work clamp.  
Work clamp moves stiffly.  
Air tube of presser lifter cylinder is bent Straighten the bend in the tube or  
or damaged (Pneumatic specifications).  
replace the tube.  
Work clamp lift amount setting at  
operation panel is incorrect (Solenoid  
specifications).  
Work clamp lift amount  
is incorrect.  
Change the work clamp lift amount  
setting.  
Instruction  
manual  
Work clamp arm lever position is Adjust the position of the work clamp  
P. 100  
P. 85  
P. 85  
P. 97  
P. 97  
P. 97  
incorrect. (Pneumatic specifications)  
arm lever.  
Work clamp does not  
lift to the maximum  
height.  
Work clamp arm stopper position is  
incorrect (Solenoid specifications).  
Adjust the position of the stopper.  
Cylinder joint position is incorrect.  
(Pneumatic specifications)  
Adjust the position of the cylinder joint.  
Adjust the height of the thread wiper.  
Adjust the stroke of the thread wiper.  
Adjust the stroke of the thread wiper.  
Thread wiper does  
not operate correctly.  
The thread wiper is obstructing the  
needle.  
Thread wiper position is incorrect.  
Lower thread winds  
to one side.  
Bobbin winder tension assembly height Adjust the height of the bobbin winder  
Instruction  
manual  
is incorrect.  
tension assembly.  
Lower thread winding  
amount is incorrect.  
Instruction  
manual  
Bobbin presser position is incorrect.  
Adjust the position of the bobbin presser.  
Thread slips out of  
the needle.  
Stitches being skipped at the sewing  
start.  
Refer to "Skipped stitches occur".  
Adjust the sub-tension.  
P. 142  
Instruction  
manual  
Upper thread length is irregular.  
Position of shuttle race thread guide is Adjust the position of the shuttle race  
incorrect thread guide.  
P. 92  
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10. TROUBLESHOOTING  
Problem  
Cause  
Remedy  
Reference  
Upper thread breaks.  
Upper thread tension is too strong.  
Adjust the upper thread tension.  
P. 89  
Instruction  
manual  
Needle is incorrectly installed.  
Install the needle correctly.  
Thread is too thick for the needle.  
Select a thread that matches the needle.  
P. 89  
P. 90  
Thread take-up spring tension and Adjust the tension and height of the  
height are incorrect.  
thread take-up spring.  
Damage or burring of the rotary hook,  
needle hole plate or needle.  
Repair or replace the problem part.  
Thread breaking from heat (Synthetic  
thread)  
Instruction  
manual  
Use a cooling tank.  
Instruction  
manual  
Thread is threaded incorrectly.  
Thread the thread correctly.  
Adjust the lower thread tension.  
Repair or replace the problem part.  
Adjust the needle clearance.  
Adjust the needle bar lift amount.  
Adjust the driver needle guard.  
Replace the needle.  
Lower thread breaks.  
Skipped stitches occur.  
Lower thread tension is too strong.  
P. 89  
Damage to corners of needle hole plate  
or bobbin case.  
Clearance between needle and rotary  
hook tip is too great.  
P. 92  
P. 91  
P. 91  
Needle and rotary hook timing is  
incorrect.  
The driver is covering the needle more  
than necessary.  
Needle is bent.  
Instruction  
manual  
Needle is incorrectly installed.  
Install the needle correctly.  
Adjust the needle clearance.  
Adjust the needle bar lift amount.  
Replace the needle.  
Needle is broken.  
P. 92  
P. 91  
Clearance between needle and rotary  
hook tip is too great.  
Needle is bent.  
Select a needle that is suitable for the  
sewing conditions.  
Reduce the sewing speed.  
Needle deflection  
Needle is too thin.  
P. 89  
P. 89  
P. 90  
P. 91  
P. 92  
Select a needle that is suitable for the  
sewing conditions.  
Thread jamming.  
Thread take-up spring tension and Adjust the tension and height of the  
height are incorrect.  
thread take-up spring.  
Needle and rotary hook timing is  
incorrect.  
Adjust the needle bar lift amount.  
Shuttle race thread guide is not Adjust the position of the shuttle race  
separating the threads. thread guide.  
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10. TROUBLESHOOTING  
Problem  
Cause  
Remedy  
Reference  
Upper thread is not  
trimmed.  
Movable knife is not cutting cleanly.  
Replace with a new one.  
P. 95  
Sharpen the fixed knife or replace it  
with a new one.  
Fixed knife is not cutting cleanly.  
P. 95  
P. 92  
P. 91  
P. 142  
Adjust the position of the shuttle race  
thread guide.  
Movable knife is not picking up the  
upper thread.  
Adjust the needle bar lift amount.  
Movable knife is not picking up the  
upper thread because the last stitch is Refer to "Skipped stitches occur".  
being skipped.  
Adjust the position of the movable  
P. 93  
P. 94  
Movable knife position is incorrect.  
knife.  
Turn the sub-tension nut to adjust the  
Instruction  
manual  
Sub-tension is too weak.  
tension.  
Poor stitch finish on  
underside of material.  
Shuttle race thread guide is not Adjust the position of the shuttle race  
P. 92  
P. 89  
separating the threads enough.  
thread guide.  
Incorrect tightening of the upper thread Adjust the upper thread tension.  
Instruction  
manual  
Upper thread length is irregular.  
Upper thread tension is too weak.  
Lower thread tension is too weak.  
Adjust the sub-tension.  
Incorrect tightening of  
the thread  
Adjust the upper thread tension.  
Adjust the lower thread tension.  
P. 89  
P. 89  
P. 90  
P. 90  
P. 90  
Thread take-up spring tension and Adjust the tension and height of the  
height are incorrect. thread take-up spring.  
Position of arm thread guide R is Adjust the position of arm thread guide  
incorrect. R.  
Upper thread length is  
irregular.  
Thread take-up spring tension and Adjust the tension and height of the  
height are incorrect.  
thread take-up spring.  
Turn the sub-tension nut to adjust the  
tension.  
Instruction  
manual  
Sub-tension is too weak.  
Sharpen the fixed knife or replace it  
with a new one.  
Fixed knife is not cutting cleanly.  
P. 95  
Sewing machine does  
not operate when the  
power is turned on and  
the foot switch is  
depressed.  
Check if the machine head switch cord  
is disconnected.  
Instruction  
manual  
Adjust the position of the machine head  
switch.  
P. 88  
Machine head switch does not work.  
If the machine head switch is  
malfunctioning, replace it with a new  
one.  
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11. 7-SEGMENT DISPLAY  
11. 7-SEGMENT DISPLAY  
０
Ａ
Ｋ
Ｕ
１
Ｂ
Ｌ
Ｖ
２
Ｃ
Ｍ
Ｗ
３
Ｄ
Ｎ
Ｘ
４
Ｅ
Ｏ
Ｙ
５
Ｆ
Ｐ
Ｚ
６
Ｇ
Ｑ
７
Ｈ
Ｒ
８
Ｉ
Ｓ
９
Ｊ
Ｔ
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SERVICE MANUAL  
http://www.brother.com/  
15-1, Naeshiro-cho, Mizuho-ku, Nagoya 467-8561, Japan. Phone: 81-52-824-2177  
BAS-311G, BAS-326G  
I5060885B  
Printed in Japan  
2005.07. B (1)  
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