Oki Printer 3390 User Manual
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MICROLINE 3390/3391  
PRINTER  
Maintenance Manual  
All specifications are subject to change without notice.  
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TABLE OF CONTENTS  
1.  
2.  
CONFIGURATION  
1.1  
1.2  
Standard Printer Configuration  
Options  
THEORY OF OPERATION  
2.1  
Electrical Operation  
2.1.1 Summary  
2.1.2 Microprocessor and the Peripheral Circuit  
2.1.3 Initialization  
2.1.4 Parallel Interface Control  
2.1.5 Print Control  
2.1.6 SP/LF Motor Control  
2.1.7 Operation Panel  
2.1.8 Alarm Circuit  
2.1.9 Power Supply Circuit  
Mechanical Operation  
2.2  
2.2.1 Printhead Mechanism and Operation  
2.2.2 Spacing Operation  
2.2.3 Head Gap Adjusting  
2.2.4 Ribbon Drive  
2.2.5 Paper Feed Operation  
2.2.6 Paper Detection Mechanism  
2.2.7 Automatic Sheet Feed  
2.2.8 Paper Park Function  
3.  
ASSEMBLY/DISASSEMBLY  
3.1  
3.2  
3.3  
Precautions for Parts Replacement  
Service Tools  
Disassembly/Reassembly Procedure  
3.3.1 Printhead  
3.3.2 Ribbon Protector  
3.3.3 Pull-up Roller Assy  
3.3.4 Upper Cover Assy, Access Cover Assy and Sheet Guide Assy  
3.3.5 Gear Case Assy  
3.3.6 PC Connector  
3.3.7 Space Motor, Guide Roller Assy  
3.3.8 Space Rack  
i
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3.3.9 Carriage Cable  
3.3.10 Backup Roller Holder Assy  
3.3.11 Platen Assy  
3.3.12 Driver Board (SRXD)  
3.3.13 LF Motor  
3.3.14 Operation Panel PCB (LEOP)  
3.3.15 Control/Power Supply Board (SRXC)  
3.3.16 Transformer Assy  
3.3.17 Change Lever and Gears  
3.3.18 Carriage Shaft  
3.3.19 Paper Pan  
3.3.20 Rear Tractor Assy  
3.3.21 Rear Pressure Assy  
3.3.22 Switch Lever  
4.  
5.  
ADJUSTMENT  
CLEANING AND LUBRICATION  
5.1  
5.2  
Cleaning  
Lubrication  
6.  
TROUBLESHOOTING AND REPAIR  
6.1  
6.2  
6.3  
6.4  
6.5  
Items to Check Before Repair  
Troubleshooting Table  
Lamp Display  
Connection Circuit Check for Printhead and SP/LF Motor  
Troubleshooting Flow Chart  
APPENDIX  
A.  
B.  
C.  
PCB LAYOUT  
SPARE PARTS LIST  
RS-232C Serial Interface Board (OPTION)  
ii  
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1. CONFIGURATION  
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1. CONFIGURATION  
1.1. Standard Printer Configuration  
This printer consists of the following assemblies:  
Sheet guide assy  
Platen knob  
Access cover  
assy  
Upper cover  
Transformer assy  
Pull-up roller assy  
Control/Power supply assy  
Driver board  
Operation panel assy  
Main frame  
Figure 1-1 Configuration  
1 – 1  
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1.2 Options  
(1) Cut sheet feeder unit (CSF)  
(Narrow and wide versions available)  
Dual-bin CSF  
Single-bin CSF  
Attachment assy  
(2) Pull-tractor assy  
1 – 2  
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(3) Bottom push tractor unit  
(4) Roll paper stand (Narrow only)  
(5) Serial I/F  
• RS232C  
• RS422A  
• Current Loop  
1 – 3  
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2. THEORY OF OPERATION  
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2. THEORY OF OPERATION  
2.1 Electrical Operation  
The electrical operation of the printer circuit is described in this section.  
2.1.1 Summary  
Fig. 2-1 shows the block diagram of the printer.  
The control board is made up of the microprocessors, peripheral circuits, drive circuits, sensors  
and interface connectors.  
The power to the control board is supplied by the power board through the connector cord.  
The power to other electrical parts is also distributed through the connectors within the control  
board.  
2.1.2 Microprocessor and the peripheral circuit  
(1) Microprocessor (Q7: 67X640)  
This processor is a CMOS single-chip computer with integrated peripheral device functions  
and a 16 bit MPU core, all OKI original architecture.  
The processor has a 20 bit address bus and a 16 bit data bus.  
It is capable of accessing up to 1M word program memory and 1M bytes of data memory.  
The following characteristics are also provided:  
• Built-in type data memory of 512 bytes  
• 8-bit 4-channel A/D converter × 1  
• 16-bit automatic reload timer × 2  
• 8-bit serial port × 2  
• 8-bit parallel port × 3 (bitwise I/O specification available)  
And others.  
The function of this microprocessor is to provide a central mechanism for the entire printer  
by executing the control program through the LSI and driver circuits.  
2 – 1  
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1 6 * 1 0 2 4 K b i t s  
P o w e r - o f f  
2 – 2  
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(2) Program ROM  
This is a 256 × 16 bits (4M bit) [MAX] EPROM with the control program for the printer  
stored. The MPU executes instructions under this program.  
The program ROM is assigned to the program memory area of the MPU and is fetched  
by the PSEN signal of the MPU.  
The following shows the operation of the memory access.  
MPU  
ROM  
A0~A17  
D0~D15  
PG-N  
CSO  
PSEN  
CE  
OE  
MPU CLOCK  
A0~A17  
PG-N  
PSEN-N  
D0~D15  
Program  
Program  
IN  
Program  
IN  
IN  
2 – 3  
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(3) RAM (MSM51C464A-80RS)  
The RAM is CMOS dynamic RAM with (64K × 4-bit) × 2 configuration, and used as buffers  
(such as receiving buffer, printing buffer, DLL buffer and working buffer).  
The following shows the examples of the memory access operation.  
MPU  
RAM 1 (Q3)  
A0~A7  
D0~D3  
RAM 2 (Q4)  
P03  
CS1  
RAS  
CAS  
D4~D7  
OE  
RD  
Clockout*  
A0~A7  
T1  
T2  
T3  
CS1~CS4  
RD  
D0~D7  
(Read)  
WRH  
WRL  
D0~D7  
(Write)  
8-bit bus, byte instruction  
* Clockout is provided when the original excitation is selected.  
2 – 4  
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(4) CG ROM  
This is a 1024K × 16 bits (16M bits) MASK ROM with the font data for the characters  
stored.  
CG ROM is assigned to the program memory area of the MPU and is fetched by the PSEN  
signal of the MPU.  
The following shows the memory access operation.  
MPU  
ROM  
A0~A19  
D0~D15  
CG-N  
P02  
CE  
OE  
PSEN  
MPU CLOCK  
A0~A19  
CG-N  
PSEN-N  
D0~D15  
Program  
Program  
IN  
Program  
IN  
IN  
2 – 5  
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(5) EEPROM  
The EEPROM is a CMOS serial I/O type memory which is capable of electrically erasing  
and writing 1,024 bits.  
The EEPROM contains menu data.  
The following shows the memory access operation.  
MPU  
EEPROM  
D1  
EEDIN-P  
EECS-P  
P24  
P27  
CS  
DO  
SK  
EEDOUT-P  
P25  
P26  
EECLK-P  
PRE = O  
PE = X  
EECS-P  
tCS  
EECLK-P  
Operation  
code  
Start  
code  
Address  
0
1
1
EEDIN-P  
A5  
A0  
0
EEDOUT-P  
D15  
D0 D15  
D0 D15  
Read cycle timing (READ)  
PRE = O  
PE  
tCS  
EECS-P  
EECLK-P  
Operation  
code  
Start  
code  
Address  
A5  
Data  
0
A0 D15  
D0  
1
1
EEDIN-P  
Bus  
Ready  
EEDOUT-P  
twp  
Write cycle timing (WRITE)  
2 – 6  
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(6) LSI  
This LSI detects and controls the SP motor speeds by monitoring the two phase sensor  
signals obtained from the DC motors and modifying the excitation phases as appropriate.  
This LSI is connected in multiplex to the MPU.  
MPU  
LSI  
A/D bus  
P07  
ALE  
RD  
RDN  
WRL  
WRL  
P01  
LSIC  
Clockout*  
A0~A19  
LSICS  
ALE  
D0~D15  
(Read)  
Address  
Data  
RD  
D0~D15  
(Write)  
Address  
Data  
WRL  
* Clockout is provided when the original  
excitation is selected.  
2 – 7  
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2.1.3 Initialization  
This printer is initialized when the power is turned on or when the I-PRIME-N signal is input  
from the host side via the parallel interface.  
For the initialize operation, the RST-N signal is first output from the reset circuit to reset the  
MPUs and LSIs. When resetting ends, the program starts and the LSIs are reset by MPU via  
LSIRST-N. Reset operation by I-PRIME starts program to initialize, but does not reset the MPU.  
The program here sets the mode of the LSI including the MPU, checks the memories (ROMs  
and RAMs), then carries out carriage homing, and determines the LF motor phase.  
Finally, the program establishes the interface signals (P-I/F: ACK-P signal sending, and S-I/F:  
BUSY-N signal off) and lights the SELECT lamp to inform the ready state for receiving to the  
host side and ends the initialize operation.  
Start  
MPU RESET  
MPU  
Initial Setting  
Internal RAM  
CHECK  
ROM CHECK  
LSI RESET  
External RAM  
CHECK  
LSI Initial Setting  
and I/F Busy ON  
RAM Clear  
Carriage Homing  
LF Motor Phase  
Initialization  
Serial  
I/F  
Parallel  
I/F  
I/F BUSY OFF  
I/F ACK Send  
End  
2 – 8  
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2.1.4 Parallel Interface Control  
The parallel data input from the host to the interfaced LSI is latched to its internal register at  
the falling edge of the STROBE-N signal.  
At the same time, the LSI sets the BUSY signal to the high level to inform the host that the  
data is being processed, and outputs the RXD signal to inform the MPU of data reception. The  
data is read upon receiving the RD-N signal from the MPU.  
When the data processing ends, the BUSY signal is set to off and the ACK-N signal in sent  
to request the next data. When reception is impossible because the buffer is full, the BUSY signal  
is sent to request stopping of data transmission.  
CN1  
MPU  
LSI  
Receive Data  
NBSY  
BUSY  
A/D bus  
RXD  
ACK-N  
STB-N  
ACK  
NSTB  
P16  
NRXD  
Data  
1 to 8  
STROBE  
500ns max.  
BUSY  
ACK  
2~8µs  
RXD  
2 – 9  
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2.1.5 Print Control  
Print data is transmitted as parallel data (HEAD1~HEAD24) from LSI to print head. LSI generates  
print timing and drive time.  
Control/Power Supply Board  
MPU  
Driver Board  
LSI  
A/D bus  
DRIVER  
Print Head  
Print Data  
Print Data  
HEAD1-N~  
HEAD24-N  
HEAD1~  
HEAD24  
HEAD DRIVE TIMING CHART  
DT1  
DT2  
HEAD  
DRIVE CURRENT  
2 – 10  
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Print Compensation Control  
The print compensation can be made as shown below:  
(a) Voltage compensation (See 2.1.8 “Alarm Circuit.”)  
(b) Temperature compensation (See 2.1.8 “Alarm Circuit.”)  
(c) Pin stroke compensation  
Platen  
Print Head  
Pin 1~4  
5~20  
As shown in the drawing left, the stroke length  
up to the platen is different for each pin.  
21~24  
Pin coil  
current  
Pin 1~4,  
21~24  
Pin 5~20  
Time  
(d) Simultaneous Compensation of the number of impact pins  
The LSI is provided with the compensation table for each pin to make necessary  
compensation.  
Number of impact pins Few  
Drive time Short  
Many  
Long  
2 – 11  
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(e) Print mode compensation  
According to the thickness of the printing medium, the print mode is compensated  
as shown in the table below:  
Head Gap Range  
Print speed  
1
2
3
4
5
100% 95% 85% 85%  
80%  
Drive time  
Short  
Long  
(Drive time lengthens at each step.)  
2 – 12  
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2.1.6 SP/LF Motor Control  
(1) Space Motor Control  
The SP motor driver (HA13412) drives the three-phase brushless motor based on the  
phase signal (SPU, SPV and SPW) and the speed instruction data from the LSI. The MPU  
can identify the current speed of the space motor by measuring through the LSI the pulse  
length of the output (øA, øB) of the slit encoder included in the space motor.  
By comparing the target speed for each print mode with the actual current speed to change  
the speed instruction data, the motor speed is accelerated or decelerated to maintain the  
specified speed for each print mode.  
SPU  
SPV  
SPW  
SP truth table  
HALL  
SPU  
AMP  
SPV  
INPUT  
SPW  
OUTPUT  
V
U
W
H
H
H
L
H
L
L
L
OPEN  
L
OPEN  
H
H
H
L
L
H
H
H
L
L
OPEN  
H
OPEN  
L
L
H
L
H
H
OPEN  
L
L
L
H
OPEN  
2 – 13  
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(2) Encoder Disk  
In the operation of the spacing motor, the PHASE-A and PHASE-B signals are generated  
when the encoder disk interrupts the photo sensor.  
The LSI divides these edge pulse signals in accordance with the print pitch, and sends  
the IPT signal to provide dot-on timing and carriage position detection timing.  
SPU  
SPV  
SPW  
PHASE-A  
PHASE-B  
1/720"  
• UTILITY MODE  
IPT 10 CPI  
1/120"  
IPT 12 CPI  
IPT 15 CPI  
IPT 17 CPI  
IPT 20 CPI  
1/144"  
1/180"  
1/206"  
1/240"  
2 – 14  
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(3) LF Motor Control  
The LF motor driver (MTD2005F) drives the LF motor in two-phase or 1-2 phase bipolar,  
based on the phase changeover data and the output current data from the LSI.  
The data from the LSI is processed by a specific register contained in the LF motor driver  
to measure the overdrive time and to change the phase.  
PHASE-A  
PHASE-B  
[FORWARD]  
[REVERSE]  
2 – 15  
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2.1.7 Operation Panel  
The clock synchronization OPCLK of LSI is used to input the switch data and output the LED  
data through the operation panel control LSI (IC1: BU5148S).  
LSI  
OPTXD  
OPTD  
77  
OPCLK  
OPCK  
Command  
and Data  
latch  
LED Driver  
78  
80  
79  
OPCLR-N  
OPRXD  
NPA2  
OPRD  
+5V  
Switch  
controller  
A 2-byte (15 bits + 1 even parity bit) command (OPTXD) is transmitted to the LSI (BU5148S)  
in synchronization with the OPCLK signal. The LSI decodes this command and when it is found  
to be legal, returns a 2-byte command response back to the LSI which includes data on Switch  
information, LED status, receive command ACK/NAK and 1 odd parity bit.  
Any transmission errors found cause the command to be reissued after the transmission of the  
OPCLR-N signal.  
2 – 16  
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2 – 17  
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2.1.8 Alarm Circuit  
(1) Head drive time alarm circuit  
This circuit monitors the drive time using the HDALM signal interlocked with the overdrive  
signal of each drive circuit.  
If the drive time of any drive circuit exceeds the specified time, the drive fault alarm circuit  
sends an ALARM-N signal to turn on the SCR (SO).  
This cause the secondary coil (40V) of the transformer to be short-circuited, causing an  
overcurrent to flow through the primary coil and making the AC fuse (transformer ASS)  
open.  
(2) Alarm processing when DC power is low.  
+ 40V is converted into the POWLEV signal (0V to +5V) by R531 and R532 and input  
into the A/D port of the MPU to control the drive time and the print speed (pass number)  
of the head.  
+40V  
R531  
POWLEV  
R532  
(a) Head drive time  
The head drive time is lengthened to compensate for the amount of voltage drop by  
monitoring the POWLEV signal once every 500 µ sec. to control and maintain the  
impact necessary for each printing pin at the fixed value.  
(b) Print speed  
Voltage, +40V  
38V or more  
25V to 37V  
25V or less  
Pass number  
1 Pass  
Print speed  
100%  
1 Pass  
100~30%  
30%  
1 Pass  
2 – 18  
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(3) Head overheat alarm  
The voltage of the output TSD signal of the thermistors, one of which is contained in the  
print head and the other in the print head driver, is monitored by the CPU/AD port to control  
the voltage  
Temp  
Stop  
119°C  
Mode up  
α°C  
ß°C  
Mode down  
Mode and print control  
Mode  
Speed  
100%  
85%  
70%  
55%  
40%  
30%  
Stop  
Pass  
Direction  
1
2
1
1
1
1
1
1
Bi  
Bi  
Bi  
Bi  
Bi  
Bi  
3
4
5
6
1.5 Sec Stop  
(7)  
• When the temperature is between α°C and 119°C, the mode switches sequentially to  
higher level. When the temperature falls below ß°C, the mode switches to lower level.  
• When the temperature exceeds 119°C, printing will stop.  
• When temperature gradient is steep, higher mode shall be specified directly.  
2 – 19  
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2.1.9 Power Supply Circuit  
This power supply circuit supplies the +5VDC, +8VDC, +40VDC, 10VAC.  
Control Board  
SW  
Noise  
filter  
circuit  
Rectifier  
+40V  
+8V  
Fuse  
Trans-  
former  
Rectifier  
Regulation  
Circuit  
+5V  
AC10V  
The uses of output voltages and signals are described below.  
Voltage/signal  
+5V  
Use  
Logic IC/LED drive voltage  
+8V  
Serial interface line voltage and SP motor driver  
+ 40V  
Printhead, LF motor drive voltage, SP motor drive voltage  
Option board  
AC 10V  
2 – 20  
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2.2 Mechanical Operation  
2.2.1 Printhead mechanism and operation (See Figure 2-2.)  
The printhead is a spring charged 24-pin driving head using a permanent magnet. It is attached  
to the carriage, which moves in parallel with the platen. Electrically, this unit is connected to  
the control circuits through the control board.  
#1  
#2  
#23  
#24  
Figure 2-2 Arrangement of the head pins  
View from the tip of the printhead  
(1) The printhead configuration:  
The printhead is composed of the following parts:  
(a) Wire guide  
(b) Spring assembly (Wire, Armature, Spring, Yoke, Spacer)  
(c) Magnet assembly (Magnet, core, coil, Yoke)  
(d) Printed circuit board  
2 – 21  
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(2) Operation of printhead (See Figure 2-3.)  
(a) When the printhead is idle, the armature is attracted by a permanent magnet and  
the spring fixing the armature is compressed. The print wires fixed to each armature  
are thus concealed under the wire guide.  
(b) When a signal for a character to be printed is detected, a current flows through the  
coil. When the coil is activated, the magnetic flux (caused by the permanent magnet  
between the armature and the core) is canceled to eliminate the attraction force. The  
armature is driven in the direction of the platen by the force of the armature spring.  
The print wire fixed to the armature protrudes from the tip of the wire guide, strikes  
the paper through the ribbon and prints a dot on the paper.  
(c) After the character has been printed, the armature is magnetically attracted again  
and the print wires are again concealed under the wire guide.  
A thermistor in the printhead prevents burning caused by over-heating of the coil  
during extended continuous bi-directional printing. When the temperature of the coil  
exceeds a pre-determined limit (about 119°C) the control circuit detects a thermistor  
signal. Printing will then be intermittent or stop completely until the coil temperature  
falls below the limit value.  
2 – 22  
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Paper  
Print wire  
Printhead  
Platen  
(1) When printing  
Paper  
Armature assembly  
Thermistor  
Print wire  
Wire guide  
Yoke  
Spacer  
Magnet assembly  
(2) When not printing  
Paper  
Figure 2-3  
2 – 23  
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2.2.2 Spacing operation (See Figure 2-4.)  
The spacing mechanism consists of a carriage shaft mounted in parallel with the platen, and  
a carriage frame that moves along the shaft. It is driven by a DC motor mounted on the bottom  
of the carriage frame. Items included in the spacing mechanism are as follows:  
(a) DC motor with motor gear  
(b) Carriage frame (stationary yoke and motor driver board included)  
(c) Carriage shaft  
(d) Space rack  
(e) Sensor  
(f) Encoder disk  
(1) Spacing operation  
The carriage frame, on which the printhead and space motor are mounted, moves along  
the carriage shaft in parallel with the platen. When the spacing motor rotates  
counterclockwise, the driving force is transmitted to the motor gear. As the motor gear  
rotates, the carriage moves from left to right.  
Mechanically, it is designed in such a way that for every revolution of the DC motor, the  
carriage frame moves 0.8 inch (20.32 mm).  
At the same time the encoder disk rotates together with the motor and passes the sensor.  
The position of the carriage frame can be determined by counting the interrupts detected  
by the sensor.  
In the same way, the rotation of the space motor can be recognized and controlled by  
measuring the cycle of interrupts detected by the sensor.  
2 – 24  
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Print Head  
Carriage shaft  
Space rack  
Carriage frame  
Encoder disk  
Encoder sensor  
Motor gear  
Slider  
Guide rail  
Figure 2-4  
2 – 25  
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2.2.3 Head gap adjusting (See Figure 2-5.)  
The head gap adjusting lever moves back and forth to tilt the carriage frame, altering the gap  
between the printhead and the platen.  
The adjusting screw, which is connected to the adjusting gear rotates when the adjusting lever  
is moved creating a fine gap adjustment. If the adjusting gear is pushed down, the adjusting  
screw can be turned with a screw driver to change the coarse gap adjustment.  
When the adjusting lever is set to range ➁ ~ ➄ the contact which is attached to the under side  
of the carriage cover will connect with the contact of the space motor PC board. The printer  
will reduce the printing speed automatically to ensure that adequate printing pressure is maintained  
for multipart paper.  
And, the adjusting cam adjusts the headgap toward left and right side in accordance with the  
guide rail up and down as a position of the left end of it.  
2 – 26  
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Platen  
Range  
1
Carriage shaft  
2
Printhead  
3
4
5
Adjusting lever  
Adjusting screw  
Idler gear  
Adjusting gear  
Range from 5 to 1  
Narrows  
Printhead  
Adjusting screw  
Adjusting cam  
C.C.W.  
Platen  
Guide rail  
Widens  
Range from 1 to 5  
C.W.  
Figure 2-5  
2 – 27  
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2.2.4 Ribbon drive (See Figure 2-6.)  
The ribbon driver mechanism moves the ribbon in synchronization with the space motor operation.  
The ribbon drive mechanism consist of the following items:  
(a) Ribbon drive gear assembly  
(b) Ribbon gear (space motor)  
(c) Ribbon cartridge  
(1) Ribbon cartridge  
An endless ribbon with a single direction feed is used. Ink is supplied from an ink tank,  
which is built in to the ribbon cartridge.  
(2) Ribbon feed operation  
When the space motor is activated, the ribbon gear rotates. The rotation is transmitted  
via the ribbon drive gear assembly to the drive gear in the ribbon cartridge, thus moving  
the ribbon.  
The feed direction of the ribbon is maintained by switching the rotational direction of the  
gears in the ribbon drive gear assembly. This ensures ribbon movement when bidirectional  
printing is used.  
2 – 28  
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Ribbon cartridge  
Drive gear  
Ink tank  
Figure 2-6  
2 – 29  
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2.2.5 Paper feed operation  
Feeding of the paper is performed by turning the platen and the pin tractor, which is driven by  
the LF pulse motor.  
Item of the paper feed mechanism are as follows:  
(a) Pulse motor with gears  
(b) Decelerating gear  
(c) Platen  
(d) Tractor feed unit  
(e) Pressure roller  
2 – 30  
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(1) Cut sheet and continuous sheet switching mechanism (See Figure 2-8.)  
Three different paper paths can be selected and set by the change lever.  
(a) TOP (for cut sheet)  
When the cut sheet is used in the manual mode or fed by the CSF (option), set the  
change lever at the position marked TOP.  
[Operation]  
The driving force of the platen gear (R) is transmitted to the idle gear by setting the  
change lever to the TOP position. However, this causes the idle gear to be disengaged  
from the change gear, leaving it free.  
At this time, the pressure rollers (at the rear and the front) are pressed securely to  
the platen to feed the cut sheet. At the same time, the switch lever positions between  
the rear switch and bottom switch, to confirm to the control board that you are in the  
cut sheet mode.  
In the cut sheet mode, the control board automatically feeds the sheet up to the print  
start position after pausing for the wait time stored in the menu.  
(b) REAR (Continuous sheet from push tractor)  
When the change lever is set to REAR position, the change gear is engaged with  
the idle gear and the tractor gear to transmit the rotation of the platen to the push  
tractor shaft, and the continuous sheet is fed from the push tractor.  
At the same time, the switch lever turns on the rear switch, to confirm to the control  
board that you are in the continuous sheet mode.  
2 – 31  
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(c) BOTTOM (Continuous sheet from bottom feeder) (option)  
When the change lever is set in the BOTTOM position, the rotation of the platen  
is transmitted to the drive gear of the bottom tractor feed unit through the idle gear  
to feed the sheet which has been set in the bottom tractor feed.  
At the same time, the switch lever turns on the bottom switch, to confirm to the control  
board that you are in the continuous sheet mode.  
Correlation in Mechanism  
Mechanism  
Rear  
Switch  
Bottom  
Switch  
Idle  
Gear  
Change  
Gear  
Tractor  
Gear  
Sheet  
Insertion  
Lever  
Position  
Manual/  
automatic  
TOP  
OFF  
OFF  
Rotate  
Stop  
Stop  
CSF:  
Operation SW  
or instruction  
• Operation  
SW  
or  
REAR  
ON  
OFF  
ON  
Rotate  
Rotate  
Rotate  
Rotate  
Rotate  
Stop  
• instruction  
• Operation  
SW  
or  
BOTTOM  
OFF  
• instruction  
2 – 32  
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Control Power  
supply Assy  
Bottom switch  
Switch lever  
Change gear shaft  
Rear switch  
Change lever  
Release shaft  
Change arm  
TOP  
Platen  
REAR  
BOTTOM  
Change lever  
Tractor gear  
Change gear  
Platen gear (R)  
Reset spring  
Idle gear  
(Bottom tractor unit)  
Figure 2-8  
2 – 33  
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(2) Cut-sheet feeder operation (See Figure 2-9.)  
The pulse motor used for the paper feed mechanism is mounted on the left of the frame,  
and the rotation of the motor is transmitted through decelerating gears (LF idle gear, platen  
gear) to the platen. When using cut-sheet paper, the change lever must be in the TOP  
position to grab the paper, while disengaging the push tractor.  
When the change lever is set to the TOP position, the cut sheet is automatically fed  
in up to the print start position after pausing for the wait time stored in the menu.  
Stepping motor  
(LF motor)  
Pressure roller  
Platen  
Platen gear  
LF Idel gear  
Figure 2-9  
2 – 34  
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(3) Continuous paper feed operation (Rear) (See Figure 2-10.)  
The force transmitted to the platen, rotates the tractor gear through platen gear, the idler  
gear and the change gear. The rotation of the tractor gear makes the pin tractor belt rotate  
through a sheet feeder shaft, feeding the continuous paper.  
Platen gear  
Tractor gear  
Paper  
Idle gear  
Change gear  
Figure 2-10  
2 – 35  
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(4) Push and pull tractor mechanism (Option) (See Figure 2-11).  
This mechanism consist of an optional pull tractor and a standard push tractor mechanism.  
This mechanism can perform forward and reverse feed by setting continuous sheets to  
the push tractor and pull tractor.  
The rotation of the platen is transmitted to the push tractor and the pull tractor. Sheets  
are fed by these two tractors at the same time.  
To remove slack from the sheets, set the sheets according to the following procedure when  
using the push and pull tractors.  
1
Set the change lever to the REAR position (setting the sheets to the push tractor  
to feed).  
2
3
4
Set the paper, which is fed in front of the platen, to the pull tractor.  
Set the change lever to the TOP position and feed paper using the platen knob.  
If paper slack is removed, set the change lever to the REAR position.  
Pull tractor  
Drive gear  
Idle gear  
Push tractor  
Platen gear  
Platen  
Figure 2-11  
2 – 36  
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(5) Pull tractor mechanism (option) (See Figure 2-12.)  
Bottom feed of continuous sheets is possible only when an optional pull tractor unit is  
installed.  
The rotation of the platen is transmitted to the idle gear of the pull tractor unit through  
the platen gear at the left end of the platen. The rotation of the idle gear is transmitted  
to the drive gear, and continuous sheet forms are fed by the pull tractor being rotated  
through the sheet feeder shaft.  
Continuous sheet form  
Pull  
Tractor assembly  
Sheet feeder shaft  
Drive gear  
Idle gear  
LF motor  
Platen  
Platen gear  
LF Idle gear  
Figure 2-12  
2 – 37  
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(6) Bottom push feed operation (option) (See Figure 2-13).  
The bottom push feed of the continuous sheet is possible only when the bottom tractor  
feed unit is installed.  
When the platen rotates, the rotational force of the platen is transmitted through the tractor  
idle gear and the tractor change gear to the tractor drive gear of the bottom push tractor,  
and the sheet of paper is fed in to the print start position.  
Platen  
Platen gear  
Change gear  
Idle gear  
Tractor change gear  
Tractor idle gear  
Tractor drive gear  
Figure 2-13  
2 – 38  
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(7) Paper clamp mechanism (See Figure 2-14.)  
When setting the change lever to the BOTTOM , TOP or REAR position, the operation  
of the front release gear arm changes according to the position of the release cam. And  
at the same time, the position of the cam installed to the front release gear shaft changes,  
and the open and close of the pressure roller.  
Position of  
Open or close of  
Open or close of  
change lever  
front pressure roller rear pressure roller  
BOTTOM  
TOP  
OPEN  
CLOSE  
OPEN  
OPEN  
CLOSE  
OPEN  
REAR  
2 – 39  
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TOP  
Change lever  
Release cam  
Platen  
Change arm  
BOTTOM  
REAR  
Figure 2-14  
2 – 40  
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2.2.6 Paper detection mechanism (See Figure 2-15.)  
(1) Cut sheet detection  
When the cut sheet is inserted, the point A is pushed backward and the paper near end  
lever B rotates counter clockwise (CCW).  
At this time, the rear sensor lever rotates counterclockwise (CCW), the rear sensor lever  
and pulls out of the rear and top paper end sensor to detect that the sheet is provided.  
The procedure for the paper end is made in the reverse order, that is, its detection is  
performed when the paper end sensor is blocked.  
(2) Rear feed detection  
When the sheet is fed from the push tractor, the point B is pushed to the front side and  
the paper near end lever A rotates clockwise (CW). At this time, the rear sensor lever  
rotates counterclockwise (CCW), and pulls out of the rear and top paper end sensor to  
detect that the sheet is provided.  
The procedure for the paper end is made in the reverse order, that is, its detection is  
performed when the rear sensor lever intercepts the sensor.  
(3) Bottom feed detection  
When the sheet is fed from the bottom, the point C rotates clockwise (CW). When the  
bottom sensor lever rotates clockwise (CW), it pulls out of the bottom paper end sensor  
to detect that the sheet is provided.  
The procedure for the paper end is made in the reverse order, that is, its detection is  
performed when the bottom sensor lever intercepts the sensor.  
2 – 41  
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Paper end sensor  
Sensor lever  
A
Shaded portion  
Paper end lever  
B
Bottom paper end lever  
Figure 2-15  
2 – 42  
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(4) Top line print mechanism (See Figure 2-16).  
The front edge of the sheet is protected by the ribbon protector so that it can stop at a  
position just near to the print head (0 tear off position) to start printing at the front end  
of the sheet, without causing the sheet to crumple or curl up.  
The printing starts at the front end of the sheet, and continues uni-directionally until the  
front end of the sheet gets to the inside of the pull up roller cover.  
After that, that printing continues bi-directionally.  
2 – 43  
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Platen  
Ribbon protector  
Printhead  
Carriage frame assembly  
Figure 2-16  
2 – 44  
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2.2.7 Automatic sheet feed  
This function is used to feed in the sheet automatically up to the print start position when the  
cut sheet or the continuous sheet is used.  
[Operational procedure]  
(1) When using the cut sheet  
1) Set the change lever to the TOP position. (See Figure 2-17.)  
2) Insert a sheet of paper between the platen and the paper shoot.  
3) After the lapse of time selected by the “wait time” in the menu, the LF motor starts  
its operation to feed the sheet of paper up to the print position.  
4) When the default is selected, the sheet of paper is feed in up to the position 0.35  
inches (first dot position) from the upper end of the sheet. However, the 0 tear off  
mechanism allows the printing at the front end of the sheet by changing the TOF  
position.  
Sheet setting  
Time out  
PE  
Detection timer  
Time selected  
on the menu  
LF action  
SW2  
SW1  
REAR  
TOP  
BOTTOM  
TOP  
REAR  
BOTTOM  
Figure 2-17  
2 – 45  
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(2) When using the continouos paper  
1) Set the change lever either to the rear side or the bottom side position. (See Figure  
2-17.)  
2) Set a sheet of paper either to the push tractor or the bottom tractor.  
3) Press the “FF/LOAD” switch.  
4) The LF motor starts its operation to feed the paper up to the print start position.  
5) The paper is fed in up to the TOF position (Factory default: 0.35 inches from the top).  
Push down the “FF/LOAD” switch.  
Detection of the sheet supplied  
PE  
LF action  
Line feed (about 3 inches) until the  
detection of the sheet supplied  
When the “”FF/LOAD” switch is pushed down, the LF motor feeds in the sheet about 3  
inches. When the LF motor completes the operation and the sheet has not been fed in,  
the feeding operating operation becomes, ineffective, thus resulting in the feeding jam.  
2 – 46  
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2.2.8 Paper park function (continuous paper)  
Continuous sheets which have been inserted can be reversed automatically by using the “PARK”  
button on the operation panel.  
1)  
2)  
Press the “PARK” button on the operation panel.  
Reverse LF is started and paper is fed in reverse until paper end occurs or 19 inches  
maximum have been fed.  
3)  
The paper is fed in reverse, to leave the paper on the push-tractor or bottom-tractor.  
PARK  
PE  
Paper end detection  
LF action  
Reverse LF from P.E. Sensor to tractor feed assy.  
Reverse LF until paper end or 19 inches max.  
Alarm LED lights up when P.E. is not detected after 19 inches reverse feeding.  
Operator can press SEL key to turn off the ALARM LED then press PARK key to continue  
park function.  
This operation is required when the length of paper for parking is more than 19 inches.  
2 – 47  
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3. ASSEMBLE/DISASSEMBLE  
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3. ASSEMBLY/DISASSEMBLY  
This section explains the procedures for removing and installing various assemblies and units  
in the field.  
Description is mainly limited to the removal procedure; installation should basically be performed  
in the reverse sequence of the removal procedure.  
3.1 Precaution for Parts Replacement  
(1) Remove the AC cable and the interface cable before disassembling or assembling.  
(a) Turn off the AC power switch. Remove the AC input plug of the AC cable from the  
receptacle. Remove the AC cable from the inlet on the printer (only 200V).  
(b) To connect the AC cable again, connect it to the inlet on the printer (only 200V) first,  
then insert the AC input plug into a receptacle.  
AC input aplug  
AC receptacle  
AC cable  
Interface cable  
(2) Do not disassemble the printer as long as it is operating normally.  
(3) Do not remove unnecessary parts, and limit the disassembly area as much as possible.  
(4) Use the designated service tools.  
(5) Carry out disassembly in the prescribed sequence; otherwise, damage to the parts may  
result.  
(6) It is advisable to temporarily install screws, snap rings and other small parts in their original  
positions to avoid losing them.  
(7) Whenever handling the microprocessors, ROM, RAM IC chips and boards, do not use  
gloves which may cause static electricity.  
(8) Do not place the printed circuit board directly on the equipment or on the floor.  
(9) If adjustment is specified in the middle of installation, follow the instructions.  
3 – 1  
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3.2 Service Tools  
Table 3.1 lists the tools necessary for replacing printed circuit boards and parts of units in the  
field.  
Table 3.1 Service tools  
No.  
1
Service Tool  
Q’ty  
1
Use  
Remarks  
No. 1-100 Phillips  
screwdriver  
Screws  
2.6 mm  
No. 2-200 Phillips  
screwdriver  
Screws  
3-5 mm  
2
3
4
5
6
7
8
1
1
1
1
1
1
1
No. 3-100  
screwdriver  
Spring hook  
J-YX4025–83335-3  
Volt/ohmmeter  
Feeler gauge  
Pliers  
Head gap  
adjustment  
Head gap  
adjustment  
9
No. 5 nippers  
1
1
1.1 lbs (500 g)  
bar pressure gauge  
10  
3 – 2  
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3.3 Disassembly/Reassembly Procedure  
This section explains the assembly replacement procedures according to the following disassembly  
system.  
[Parts Layout]  
Upper cover assy  
Transformer assy  
Control/Power supply board  
Printhead  
Driver board  
Operation panel board  
Printer unit  
Figure 3-1 Printer unit  
3 – 3  
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[How to Change Parts]  
This section explains how to change parts and assemblies appearing in the disassembly diagram  
below.  
3.3.1  
Printhead  
Printer unit  
3.3.2  
Ribbon protector  
3.3.3  
3.3.4  
Pull-up roller assy  
Upper cover, access cover and sheet guide  
3.3.5  
3.3.6  
Gear case assy  
PC connector  
3.3.7  
Space motor and guide roller assy  
3.3.8  
3.3.9  
Space rack  
Carriage cable  
3.3.10 Back-up roller holder assy  
3.3.11 Platen assy  
3.3.19 Paper pan  
3.3.12 Driver board (SRXD)  
3.3.13 LF motor  
3.3.18 Carriage shaft  
3.3.14 Operation panel PCB (LEOP)  
3.3.15 Control/Power supply board (SRXC)  
3.3.16 Transformer assy  
3.3.17 Change lever and gears  
3.3.20 Rear tractor assy  
3.3.21 Rear pressure assy  
3.3.22 Switch lever  
3 – 4  
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3.3.1 Printhead  
(1) Open the access over.  
(2) Pull up and rotate the head clamp 1 to unclamp the printhead 2 as shown fig. 3.3.1.  
(3) Disconnect the printhead 2 from PC connector 3.  
(4) To install, follow the removal steps in the reverse order.  
Notes on installation:  
(1) Insert the printhead 2 into the PC connector 3 while pushing it against the carriage frame  
4.  
(2) The head clamp 1 must surely be sandwiched between printhead 2 and carriage frame  
4 as shown fig. 3.3.2.  
(3) Be sure to check the gap between platen and printhead (See 4).  
(4) Be careful not to touch the print head while it is very hot.  
1
2
4
1
2
Figure 3.3.1  
Figure 3.3.2  
2
4
1
3
3 – 5  
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3.3.2 Ribbon Protector  
(1) Remove the printhead (see 3.3.1).  
(2) Open the pull-up roller cover 1.  
(3) Raise and remove the ribbon protector 2.  
(4) To install, follow the removal steps in the reverse order.  
2
1
3 – 6  
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3.3.3 Pull-up Roller Assy  
(1) Open the access cover 1.  
(2) Lift up the sheet guide Assy 4 to remove.  
Note: Please do after always removing the sheet guide Assy 4 when the pull-up roller  
Assy 2 is installed and removed.  
(3) Tilting the pull-up roller Assy 2 toward the front, remove from the shaft of platen Assy  
3.  
(4) To install, follow the removal steps in the reverse order.  
2
3
4
1
3 – 7  
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3.3.4 Upper Cover Assy, Access Cover Assy and Sheet Guide Assy  
(1) Pull off the platen knob 1.  
(2) Turn the change lever 2 toward the bottom position.  
(3) Insert a flat-blade screwdriver into grooves (5 places) (4 places for narrow type) of frame  
and twist to disengage claws of upper cover 3.  
(4) Raise the front side of upper cover Assy 3 and shift toward the rear to disengage claws  
(6 places) (5 places for narrow type) of frame.  
(5) Raise the upper cover Assy 3 to remove.  
(6) Open the access cover Assy 4 toward the front to remove.  
(7) Lift up the sheet guide Assy 5 to remove.  
(8) To install, follow the removal steps in the reverse order.  
Remark on assembly:  
Match the posts A at the both sides of the Sheet Guide 5 with the arrow marks on  
the upper cover. Push the Guide into the Cover.  
5
A
4
1
3
2
3 – 8  
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3.3.5 Gear Case Assy  
(1) Remove the printhead (see 3.31).  
(2) Remove the upper cover (see 3.3.4 (1) – (5)).  
(3) Move the carriage Assy to right hand side, remove two screws 1, then the space motor  
2.  
(4) Disconnect a carriage cable.  
(5) Disengage claws (4 places).  
Using a flat-blade screwdriver, push to widen the claw for easy disengagement.  
(6) Remove the gear case Assy 3 in upper direction and release the carriage cable from the  
cable clamp of the gear case Assy.  
(7) To install, follow the removal steps in the reverse order.  
Note on installation:  
(1) To assemble, align the direction of the SP motor axis 4 with the Gear Hole of the Gear  
Case assy.  
(2) Be sure to check, and adjust if necessary, the gap between platen and printhead (see  
4-1).  
4
2
1
3
3 – 9  
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3.3.6 PC Connector  
(1) Remove the printhead (see 3.3.1).  
(2) Remove the upper cover (see 3.3.4 (1) – (5)).  
(3) Remove the gear case Assy (see 3.3.5).  
(4) Remove the PC connector 1 from the space motor Assy 2.  
(5) To install, follow the removal steps in the reverse order.  
Note on installation:  
(1) Do not touch the space motor 2 or terminals of PC connector 1. Also, take care to avoid  
dust or foreign matters.  
(2) After installation, check and adjust the gap between platen and printhead (see 4-1).  
1
2
3 – 10  
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3.3.7 Space Motor, Guide Roller Assy  
(1) Remove the printhead (see 3.3.1).  
(2) Remove the upper cover (see 3.3.4 (1) – (5)).  
(3) Remove the gear case Assy (see 3.3.5).  
(4) Remove the PC connector (see 3.3.6).  
(5) Remove screw 2, then the guide roller Assy 3 from the space motor 1.  
(6) To install, follow the removal steps in the reverse order.  
Notes on installation:  
(1) Do not touch the terminals of space motor 1. Also, take care to avoid dust or foreign  
matters.  
(2) When installing the guide roller Assy 3, push portions A and B against the space motor  
1.  
(3) When installing the space motor 1, align the face C with carriage frame 4 and push portion  
D against the frame.  
(4) After installation, check and adjust the gap between platen and printhead (see 4-1).  
2
4
C
3
D
1
1
B
3
A
3 – 11  
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3.3.8 Space Rack  
(1) Remove the printhead (see 3.3.1).  
(2) Remove the upper cover (see 3.3.4 (1) – (5)).  
(3) Remove the gear case Assy (see 3.3.5).  
(4) Remove the space motor (see 3.3.7).  
(5) Remove the spring 1.  
(6) Disengage the claw on left side of space rack 2 from the frame, and remove the space  
rack 2 in upper direction.  
(7) To install, follow the removal steps in the reverse order.  
Note on installation:  
(1) After installation, check and adjust the gap between platen and printhead (see 4-1).  
1
2
1
2
2
3 – 12  
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3.3.9 Carriage Cable  
(1) Remove the printhead (see 3.3.1).  
(2) Remove the upper cover (see 3.3.4 (1) – (5)).  
(3) Remove the gear case Assy (see 3.3.5).  
(4) Remove the space motor (see 3.3.7).  
(5) Remove the space rack (3.3.8).  
(6) Remove two screws 1, release the driver board 2 and PCB sheet 9 by lifting clamp 8,  
and disconnect cable from connector 3, 4, 5, 6.  
(7) Remove carriage cable 7 from fasteners on frame.  
(8) To install, follow the removal steps in the reverse order.  
Note on installation:  
(1) Take care not to fold the carriage cable 7 during installation. Curve slightly the carriage  
cable 7 when assembling into the fasteners.  
(2) Make sure that the paper end lever A will not contact the Paper end Sensor 0 when  
mounting the Driver Board.  
7
A
0
2
8
6
9
2
5
1
3
7
Claw  
Claw  
4
1
3 – 13  
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3.3.10 Backup Roller Holder Assy  
(1) Remove the printhead (see 3.3.1).  
(2) Remove the upper cover (see 3.3.4 (1) – (5)).  
(3) Remove the gear case Assy (see 3.3.5).  
(4) Remove the space motor (see 3.3.7).  
(5) Remove the backup roller spring 2.  
Disengage claws (2 places) of roller holder from the carriage frame 1, and remove the  
backup roller holder assy 3.  
(6) To install, follow the removal steps in the reverse order.  
1
Claw (2 places)  
3
2
Note: Small round hole with metal tip on back up roller holder assy 3 should be facing  
up when installing.  
3 – 14  
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3.3.11 Platen Assy  
(1) Remove the printhead (see 3.3.1).  
(2) Remove the ribbon protector (see 3.3.2).  
(3) Remove the pull-up roller Assy (see 3.3.3).  
(4) Remove the upper cover (see 3.3.1 (1) – (5)).  
(5) Turn the change lever 1 to the bottom position.  
(6) Push in the lock levers 2 on both sides to unlock from the frame, then rotate them upward  
by 90°.  
(7) Remove the platen Assy 4 from base frame.  
(8) To install, follow the removal steps in the reverse order.  
2
2
2
4
1
2
3 – 15  
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3.3.12 Driver Board (SRXD)  
(1) Remove the upper cover (see 3.3.4 (1) – (5)).  
(2) Remove two screws 1, and release the driver board 2 and PCB sheet 5 by lifting clamp  
4.  
(3) Disconnect all cables from driver board 2.  
(4) To install, follow the removal steps in the reverse order.  
Note on installation:  
(1) Insert one sensor lever 3 between sensor when installing the driver board 2.  
2
4
4
5
1
Sensor  
2
1
3
2
3
3 – 16  
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3.3.13 LF Motor  
(1) Remove the printhead (see 3.3.1).  
(2) Remove the ribbon protector (see 3.3.2).  
(3) Remove the pull-up roller Assy (see 3.3.3).  
(4) Remove the upper cover (see 3.3.4 (1) – (5)).  
(5) Remove the platen Assy (see 3.3.11).  
(6) Remove the driver board (see 3.3.12).  
(7) Remove the left FG plate 1.  
(8) Release the lock A to remove the LF motor 2.  
(9) To install, follow the removal steps in the reverse order.  
Remark on assembly:  
(1) Press the LF Motor Cable with a portion A of the Motor Plate.  
Lock  
A
2
A
1
3 – 17  
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3.3.14 Operation Panel PCB (LEOP)  
(1) Remove the upper cover (see 3.3.4 (1) – (5)).  
(2) Disconnect the cable 1 from connector 3 of Driver board 2.  
(3) Disengage claws on both sides from the frame, and remove the operation panel 4.  
(4) Open claws (8 places) and remove the operation panel PCB 5 from the operation panel  
4.  
(5) To install, follow the removal steps in the reverse order.  
5
2
3
4
1
3 – 18  
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3.3.15 Control/Power Supply Board (SRXC)  
(1) Remove the upper cover (see 3.3.4 (1) – (5)).  
(2) Disconnect two flexible cable 3 from the connector 2 the Control/Power Supply Board  
1.  
(3) Remove the cable 5 from the connector 4 on the Control/Power Supply board 1.  
(4) Remove two screws 6, and remove the Control/Power Supply Board 1.  
(5) To install, follow the removal steps in the reverse order.  
Remark on assembly:  
(1) To mount the Control/Power Supply Board, set the change lever to the top position so  
that the Switch Lever 7 will not hooked on the microswitches 8.  
5
6
7
3
4
8
8
2
1
3 – 19  
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3.3.16 Transformer Assy  
(1) Remove the upper cover (see 3.3.4 (1) – (5)).  
(2) Remove AC inlet 1 and AC switch 2 from the frame guide.  
(3) Disconnect the cable 3 from the connector 4 on the Control/Power Supply Board 5.  
(4) Remove a screw 6 and disconnect ground cable 7.  
(5) Remove two screws 8 and shift the transformer Assy 9 to the left and remove it.  
6
1
8
7
2
9
3
4
5
3 – 20  
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3.3.17 Change Lever and Gears  
(1) Remove the upper cover (see 3.3.4 (1) – (5)).  
(2) Remove the reset spring 1, then remove the idle gear 2, the tractor gear 4 and the change  
gear 5.  
(3) Push back the protrusion of the Change Gear Shaft 6 with a flatblade screw driver to  
remove the change lever 3.  
(4) To perform mounting, follow the reverse procedure of removal.  
Remark on assembly:  
(1) To insert the change lever into the Change Gear Shaft 6, match the flat surface (D cut).  
5
4
3
1
6
2
3
D cut  
3 – 21  
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3.3.18 Carriage Shaft  
(1) Remove the printhead (see 3.3.1).  
(2) Remove the upper cover (see 3.3.4 (1) – (5)).  
(3) Remove the driver board (see 3.3.12).  
Remove the FG plate (L) 2.  
(4) Slide the carriage shaft 1 to the left side (in the direction of the arrow) to remove.  
(5) To perform mounting, follow the reverse procedure of removal.  
Note on installation:  
(1) After installation, check and adjust the gap between platen and printhead (see 4-1).  
1
2
3 – 22  
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3.3.19 Paper Pan  
(1) Remove the printhead (see 3.3.1).  
(2) Remove the ribbon protector (see 3.3.2).  
(3) Remove the pull-up roller assy (see 3.3.2).  
(4) Remove the upper cover assy (see 3.3.4 (1) – (5)).  
(5) Remove the platen assy (see 3.3.11).  
(6) Release claws A .  
(7) Lift up the paper chute assy 1 and remove.  
(8) To perform mounting, follow the reverse procedure of removal.  
1
A
3 – 23  
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3.3.20 Rear Tractor Assy  
(1) Remove the printhead (see 3.3.1).  
(2) Remove the ribbon protector (see 3.3.2).  
(3) Remove the pull-up roller assy (see 3.3.3)  
(4) Remove the upper cover (see 3.3.4 (1) – (5)).  
(5) Remove the reset spring (see 3.3.17 (3))  
(6) Remove the tractor gear 1.  
(7) Shift the drive shaft 2 to the right side to remove (in the direction of the arrow).  
(8) To perform mounting, follow the reverse procedure of removal.  
Remark on assembly:  
(1) When the Tractor Assy (L) 3 (R) 4 have been detached from the Drive Shaft, align the  
protrusions 5 of the Pin Tractor Wheels to the same direction before assembly.  
5
4
2
3
1
3 – 24  
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3.3.21 Rear Pressure Assy  
(1) Remove the upper cover (see 3.3.4 (1) – (5)).  
(2) Remove the change lever and gears (see 3.3.17).  
(3) Remove the paper pan (see 3.3.19).  
(4) Remove the rear pressure roller 1.  
(5) Rotate the release shaft 2 and move it to the left to detach the release shaft 2.  
Match the Main Frame Rib A with the protrusion B of the Release Shaft.  
(6) Remove rear pressure SP assy 3.  
(7) To install, follow the removal step in the reverse order.  
Note: (1) At mounting release shaft 2, pay attention to the gear engagement of release  
shaft 2, change arm lever 6, change gear shaft 7.  
(2) There are 5 Rear pressure Spring Assemblies. Use two pieces which have  
larger spring diameter on the right side. Use three remaining pieces on the  
left side (for ML3391).  
(3) Make sure that the Release Shaft 2 will be on top of the Support spring 4.  
(4) To assemble the Release Shaft 2, make sure that the protrusion of the switch  
lever 5 is in the U groove of the Release Shaft 2.  
3
1
2
A
3
B
3
5
4
2
7
6
2
3 – 25  
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3.3.22 Switch Lever  
(1) Remove the upper cover (see 3.3.4 (1) – (5)).  
(2) Remove the change lever and gears (see 3.3.17).  
(3) Remove the paper pan (see 3.3.19).  
(4) Remove the rear pressure assy (see 3.3.21).  
(5) Pull the Switch Lever toward you and remove it upward.  
(6) To install, follow the removal step in the reverse order.  
Remark on assembly:  
(1) At the time of the Switch Lever assembly, make sure that the Micro switch on the Main  
Board works properly.  
Switch lever  
Switch lever  
Micro switch  
3 – 26  
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4. PERIODIC MAINTENANCE  
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4. ADJUSTMENT  
(1) Be sure to carry out this adjustment with the printer mechanism mounted on the lower  
cover.  
(2) Be sure to carry out this adjustment operation on a level and highly rigid work table  
(flatness: less than 0.039 inch or 1 mm) so as to minimize adjustment error.  
4 – 1  
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No.  
Item  
Specification  
Drawing  
Adjustment method  
4–1–1 Gap between the plat-  
en and the print head  
It shall be measured  
at 3 points: the left  
end, the center and  
the right end of the  
platen.  
1) Parallelism ad-  
justment  
Variation of  
value at the  
left, the center  
and the right  
shall be less  
than 0.02 mm  
Adjustment method  
(1) Gap between the  
platen and the  
print head at the  
left end and the  
right end shall be  
adjusted by rota-  
ting the adjust  
cam.  
After adjustment, mark the adjust  
composition with a red pen.  
Left  
Right  
Adjust cam  
(2) Set the adjust  
lever at the  
Range: 1. Press  
the adjust gear  
downward (in  
direction A) to  
push the adjust  
gear and the  
adjust gear out of  
mesh.  
Marking  
(3) Adjust the gap by  
rotating the adjust  
screw in direction  
B or C while the  
adjust lever and  
the adjust gear  
are disengaged.  
0.41±0.03 mm  
2) Initial adjustment  
Carriage shaft  
Platen  
(4) After adjustment,  
mark the adjust  
cam position with  
a red pen.  
Center  
Right  
Left  
Range: 1  
Range: 5  
Print head  
Adjust lever  
Adjust screw  
Adjust gear  
Adjust cam  
4 – 2  
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No.  
Item  
Specification  
Drawing  
Adjustment method  
Note 1)  
The head gap shall be  
measured with the  
change lever set to  
rear position.  
Adjust lever  
A
Note 2)  
The head gap shall be  
measured positioning  
the platen gear (R)  
craw on the top.  
Adjust gear  
Adjust  
spring  
Note 3)  
Adjust  
screw  
Move the adjust  
screw in clockwise  
direction (in direction  
B) to measure.  
B
C
Click of platen gear R  
Gap  
Print head  
Adjust lever  
Adjust gear  
Platen  
Adjust cam  
4–1–2 Measure variation of G a p = 0 . 7 1  
gap when range is ±0.05 at the  
changed.  
range 5.  
4 – 3  
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No.  
Item  
Specification  
Drawing  
Adjustment method  
Confirm followings.  
Gap between the con- 0.3mm or more  
tact and the monitor  
Make sure that the  
gap between the con-  
tact and the motor  
PCB is 0.3 mm or  
more.  
Adjust lever  
0.3mm or  
more  
Contact  
Motor PCB  
At the time of printing  
test, make sure that  
the contact touches  
the motor PCB and it  
becomes reduced  
speed mode when the  
adjust lever is set to  
range 2 and 4.  
Touching  
4 – 4  
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No.  
Item  
Specification  
Drawing  
Adjustment method  
Confirm followings.  
4–2 Gap between the  
platen and the paper  
pan  
1±0.5  
(1) When the change  
lever is set at  
Friction position,  
the gap between  
the platen and the  
paper pan at the  
rear side shall be  
1±0.5mm.  
Change lever  
Bottom  
Rear  
(2) When the change  
lever is set at  
Rear or Bottom  
position, the gap  
between the pla-  
ten and the paper  
pan at the front  
side shall be  
1±0.5 mm.  
Platen  
Paper pan  
Friction  
position  
Rear, Bottom  
position  
Change lever  
Bottom  
(Center friction)  
4–3 Gap between the  
platen and the pressure  
roller  
Confirm followings.  
Rear  
(1) When the change  
lever is set at  
Friction position,  
all the pressure  
rollers shall be  
pressed to the  
platen.  
Platen  
(2) When the change  
lever is set at  
Rear or Bottom  
position, the gap  
between the pla-  
ten and the pres-  
sure roller at the  
rear side shall be  
3mm. The front  
pressure rollers  
shall be pressed  
to the platen.  
Paper pan  
Front pressure  
roller  
Pressure roller  
4 – 5  
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No.  
Item  
Specification  
Drawing  
Adjustment method  
To confirm:  
4–4–1 Rotation of the push  
tractor  
The tractor gear shall  
rotate smoothly when  
the change lever is  
set at Friction posi-  
tion.  
Change lever (Center friction)  
Push tractor  
Tractor gear  
Slight backlash  
4–4–2 Backlash between  
gears  
Approx. 0.05 to  
0.11 mm  
To confirm:  
There shall be slight  
backlash between  
gears to allow smooth  
rotation of gears.  
(Backlash 0.05 to  
0.11 mm)  
4 – 6  
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No.  
Item  
Specification  
Drawing  
Adjustment method  
To confirm:  
4–5–1 Ribbon feed  
Ribbon shall be fed  
smoothly when the  
carriage is moved  
from side to side.  
Ribbon feeding  
4–5–2 Running load to spac- 250g or less  
To confirm:  
Ribbon  
ing mechanism  
without a rib-  
bon cartridge  
Make sure that the  
power is turned off at  
the time of measure-  
ment.  
Load  
measurement  
portion  
Ribbon  
cartridge  
4 – 7  
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No.  
Item  
Specification  
Drawing  
Adjustment method  
To confirm:  
4–6 Engagement of the  
double gear and the LF  
motor idle gear of the  
Platen Assy.  
The idle gear of the  
LF motor and the  
platen gear (L) and  
the bias gear of the  
platen shall be in  
mesh in such way that  
the platen gear (L)  
and the bias gear  
rotate against each  
other to pinch the  
teeth of idle gear.  
LF Motor  
idle gear  
Platen gear (L)  
The idle gear stays in  
mesh with the platen  
gear (L) and the bias  
gear and not locked.  
The bias gear and the  
platen gear shall be  
staggered by one  
teeth as shown in the  
drawing.  
Bias gear  
Not good  
(Locked)  
Good  
Tension  
4 – 8  
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5. TROUBLESHOOTING  
FLOWCHARTS  
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5. CLEANING AND LUBRICATION  
5.1 Cleaning  
[Cautions]  
1.  
Be sure to turn OFF the AC POWER switch before cleaning. Remove the AC Power cord  
from the printer.  
2.  
3.  
Avoid dust inside the printer mechanism when cleaning.  
If a lubricated part has been cleaned, be sure to apply lubricating oil to that portion after  
cleaning.  
(1) Cleaning time  
When the equipment operating time has reached six months or 300 hours, whichever  
comes first.  
(2) Cleaning tools  
Dry cloth (soft cloth such as gauze), vacuum cleaner  
(3) Places to be cleaned  
Table 5.1 lists the places to be cleaned:  
Table 5.1  
Place to be cleaned  
Cleaning procedure  
Carriage shaft and the vicinity  
Paper travel surface  
Remove paper waste and wipe off  
stain, dust, ribbon waste. etc.  
5 – 1  
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Carriage  
shaft  
5 – 2  
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5.2 Lubrication  
This printer is designed to be maintenance free and requires no lubrication during normal  
operation. However it is necessary to apply lubricant in case the printer is disassembled,  
reassembled, cleaned or parts have been changed.  
(1) Cleaning time  
Remarks:  
1) Turn off the power before cleaning.  
2) Make sure that paper dust will not fall inside of the machine.  
• Cleaning period:  
6 months of operation or 300 hours of operation, whichever the earlier.  
• Cleaning points:  
Carriage shaft and surroundings:  
Paper path:  
Remove paper and ribbon dust.  
Clean stains and dusts.  
Paper End Sensor  
Remove the dust on the Sensor.  
(2) Lubricant  
• Pan motor oil (or equivalent): PM  
• Molicort (or equivalent): EM-30L  
(3) Amount of lubricant  
• Medium amount A : Apply three to four drops of oil, or 0.008 inch (0.2 mm) thick grease.  
• Small amount B : Apply one drop of oil (0.006±0.002 g)  
(4) Areas to Avoid  
No.  
Do not lubricate  
Reason  
Remarks  
1
Platen assembly  
(rubber face)  
To prevent stained paper  
and illegal paper feed.  
2
Pressure roller (rubber  
face)  
To prevent stained paper  
Pay attention not to put  
the grease on the rubber  
face of the pressure roller.  
3
4
Carriage shaft  
To stabilize carriage  
traveling load  
Ink ribbon  
image  
To prevent blurring of print  
5
6
Pin tractor  
To prevent stained paper  
Flexible cable  
and crack  
To prevent loose connection  
7
8
Motor PCB  
To prevent loose connection  
To prevent loose connection  
Connector terminals  
5 – 3  
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6. SPARE PARTS LIST  
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6. TROUBLESHOOTING AND REPAIR  
6.1 Items to Check Before Repair  
(1) Check the inspection items specified in the instruction manual.  
(2) Find out as many details of the trouble as possible from the customer.  
(3) Inspect in the conditions as close as possible to those at the time the trouble occurred.  
(4) Proceed with the repair as follows:  
Check the trouble status according to Table 6.1 for the details of the trouble. Then, locate  
the trouble position according to the detailed flowchart.  
(5) Carry out a thorough test after the repair to check for correct functioning.  
6.2 Troubleshooting Table  
Table 6.1  
Troubleshooting  
Flowchart No.  
Status  
Trouble Contents  
• Power is not supplied.  
• No spacing operation  
Surmise of Trouble  
Control/Power Supply Board,  
Driver Board, Transformer Assy.  
Space Motor, Carriage Cable,  
Printhead.  
1
2
3
Trouble upon  
power on  
Space Motor, Carriage Cable,  
Control/Power Supply Board,  
Driver Board, Spacing Mechanism  
• Homing does not end normally.  
Pressure Roller Mechanism, Pull Up  
Roller Cover.  
4
5
6
7
8
9
0
• Paper jam while paper insertion  
• Smearing/Missing dots  
• Faint or dark print  
Printhead, Driver Board, Space  
Motor, Carriage Cable  
Printhead, Ribbon Feed Assembly,  
Driver Board  
Trouble during  
printing  
Ribbon Feed Assembly, Space  
Motor, Driver Board  
• Ribbon feed trouble  
• Line feed trouble  
LF Motor, Platen Assy, LF  
Mechanism, Driver Board  
• Malfunction of switch on  
operation panel  
Operation Panel, Driver Board  
Driver Board, (I/F Board), I/F Cable,  
Menu Setting  
• Data receiving failure  
6 – 1  
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6.3 Lamp Display  
(1) Printer mode display  
Table 6.2  
LED CONDITION  
ALARM  
CATEGORY  
TROUBLE  
SHOOTING  
ALARM  
CONTENTS  
ALARM  
ON  
SEL  
OFF  
MENU 10CPI 15CPI  
From, cut sheet or bottom  
paper end  
Paper end alarm  
—
—
—
Set New paper.  
Change lever is set to TOP  
position while paper is  
already inserted from rear or  
bottom.  
• Set the lever to specified  
position.  
• Check rear sensor lever.  
• Replace Control Board  
Paper change  
lever alarm  
BLINK  
1
ON  
ON  
OFF  
—
OFF  
• Cut sheet could not be  
ejected.  
• Cut sheet could not be fed  
properly  
• Remove the paper or check  
feed Mechanism  
• Press SEL key.  
OPERATOR  
ALARM  
BLINK  
1
Paper jam alarm  
OFF  
—
—
OFF  
• Wait until it is cooled.  
• Replace P.H. or Driver  
Board  
Print Head  
thermal alarm  
BLINK  
1
Print head temperature  
exceeds 119°C  
OFF  
OFF  
—
—
—
—
• It is recovered automatically  
• Replace SP motor or Driver  
Board  
Space motor  
thermal alarm  
BLINK  
1
Temperature of space motor  
exceeds specified value.  
—
BLINK  
2
Hardware Alarm has  
occurred.  
FATAL ALARM  
OFF  
OFF  
See Table 6.3  
See Table 6.3.  
Note:  
BLINK1 : 400ms ON, 400ms OFF  
BLINK2 : 200ms ON, 200ms OFF  
—
: LED is kept in Current Condition (no change)  
(2) Fault alram display  
When the printer detects any of the various alarm states, the information is displayed as  
shown below on the operation panel. The alarm is specified by lamp combination of PRINT  
QUALITY and CHARACTER PITCH. (See Table 6.3 for details.)  
PRINT QUALITY  
LQ  
COURIER  
PRESTIGE  
GOTHIC  
BOLD  
SEL  
– ROMAN –  
– SWISS –  
UTILITY  
SEL  
MENU  
LF  
Micro Feed  
Down  
FF/LOAD  
Micro Feed  
Up  
TEAR  
SET  
PARK  
QUIET  
TOF  
SHIFT  
CHARACTER PITCH  
10  
12  
20  
15  
EXIT  
POWER ALARM  
GROUP  
ITEM  
PRINT  
17  
PROP  
RESET  
MENU  
Figure 6-1  
6 – 2  
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6 – 3  
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6 – 4  
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6 – 5  
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6.4 Connection Circuit Check for Printhead and SP/LF Motor  
(1) Printhead  
Signal  
Connector pin number  
CN1  
1
2
3
4
5
6
7
8
9
FG  
#1  
#3  
#1  
#3  
1
1
HD1  
2
2
HD3  
#5  
#7  
#9  
#5  
#7  
#9  
1
1
1
HD9  
2
2
2
HO11  
COM  
COM  
HD17  
HD19  
HD21  
HD22  
HD20  
HD18  
COM  
COM  
HD12  
HD10  
HD4  
#11  
#11  
1
2
10  
#13  
#15  
#13  
#15  
1
1
2
2
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
29  
30  
31  
32  
33  
34  
35  
36  
#17  
#19  
#17  
#19  
1
1
2
2
#21  
#23  
#21  
#23  
1
1
2
2
#2  
#4  
#2  
#4  
1
1
HD2  
2
2
TH  
FG  
#6  
#8  
#6  
#8  
1
1
2
2
HD5  
HD7  
#10  
#12  
#10  
#12  
1
1
HD13  
HD15  
COM  
COM  
HD23  
HD24  
COM  
COM  
HD16  
HD14  
HD8  
2
2
#14  
#16  
#18  
#20  
#14  
#16  
#18  
#20  
1
1
1
1
2
2
2
2
#22  
#24  
#22  
#24  
1
1
2
2
HD5  
TH  
Thermistor (Typ.: 5k ohm)  
6 – 6  
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(2) Line Feed Motor  
Resistance of each coil should be about 7.6Ω.  
Signal  
Connector pin number  
CN6  
LF1  
LF2  
LF3  
LF4  
LF  
motor  
6 – 7  
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(3) Space Motor  
Resistance of each coil should be about 5Ω.  
Signal  
Connector pin number  
CN2  
3
5
2
SP-U  
SP-V  
SP-W  
SP  
Motor  
20  
10  
11  
18  
SPA  
SPB  
+ 5V  
EL  
øA  
øB  
DA  
Vcc  
DK  
G
200Ω  
R1  
6 – 8  
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6.5 Troubleshooting flow chart  
1
Power is not supplied.  
Is the AC cable connected correctly?  
Yes  
No  
No  
Connect the AC cable correctly.  
Is fuse F1 on the transformer assy/or F1 on the control/power supply board blown?  
Yes  
Replace fuse (with same type and rating).  
Remedied?  
No  
Yes  
End  
Does DC + 8V out?  
No  
Yes  
Remove Print Head. (Turn power off, then on.)  
Remedied?  
No  
Yes  
End  
Replace carriage cable or ribbon feed mechanism.  
Remedied?  
No  
Yes  
End  
Replace Control/Power Supply Board  
Remove CN3 on Driver Board  
Measure for any short circuits between + 5V, + 40V, + 8V, 0V (EL or EP).  
Any short circuit?  
Yes  
No  
6 – 9  
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No Yes  
Replace Driver Board.  
Driver Board  
Replace Transformer Assy.  
Remedied?  
No Yes  
CN2  
20••••••••••••1  
End  
Replace Control/Power Supply Board.  
Pin No.  
Signal  
20 19 18 17 16 15 14 13 10  
9
8
7
6
5
EP  
AC  
EL  
+8V  
+40V  
+5V  
(F.G)  
10V (0V)  
6 – 10  
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2
No spacing operation  
(The alarm LED Blinks)  
Is carriage assembly binding or jammed?  
Yes  
No  
Check around space motor to repair the mechanism of space rack, back up roller,  
ribbon feed mechanism, and carriage frame etc.  
Replace space motor assy.  
Remedied?  
No  
Yes  
End  
Replace Driver Board  
Remedied?  
No  
Yes  
End  
Replace carriage cable.  
6 – 11  
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3
Homing does not end normally  
Yes  
No  
Check around space motor to repair the mechanism.  
(Space rack, ribbon feed assembly back up roller, carriage frame, support  
protector and ribbon protector.)  
Remedied?  
No  
Yes  
End  
Replace space motor assy.  
Replace space motor assy.  
Remedied?  
No  
No  
No  
Yes  
End  
Replace carriage cable  
Remedied?  
Yes  
End  
Replace Driver Board  
Remedied?  
Yes  
End  
Replace Control/Power Supply Board  
6 – 12  
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4
Paper jam while paper insertion  
Jam 1  
Check the ribbon protector.  
Check the pull up roller cover is closed properly.  
Pull up  
roller cover  
Platen  
Paper  
Ribon Protector  
Jam 2 (wrinkled paper)  
Check around pressure roller mechanism.  
•
•
•
Front pressure springs are narrow: 3 pcs; wide: 5 pcs) mounted properly or not.  
Tension of all of front pressure rollers is properly.  
Make sure of the fitting position of change gear shaft, change arm shaft and release  
shaft are correct.  
6 – 13  
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5
Smearing/Missing Dots  
Does ALARM LED blink and display alarm?  
No  
No  
No  
Yes  
See Tables 6.2 and 6.3 for troubleshooting information.  
Replace print Head.  
Remedied?  
Yes  
End  
Replace Driver Board  
Remedied?  
Yes  
End  
Replace carriage cable or space motor assembly.  
6 – 14  
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6
Faint or dark print  
Is the print head gap set properly?  
Yes  
No  
Adjust the print head gap (see section 5)  
Remedied?  
Yes  
No  
End  
Replace print Head.  
Remedied?  
No  
Yes  
End  
Replace Driver Board  
Remedied?  
No  
Yes  
End  
Replace ribbon feed mechanism  
6 – 15  
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7
Ribbon feed trouble  
Remove the ribbon cartridge.  
Move carriage to left and right.  
Does the ribbon drive shaft rotate?  
No  
Yes  
Change ribbon cartridge.  
Remove ribbon feed mechanism.  
Move carriage to left and right.  
Does the ribbon drive shaft rotate?  
Yes  
No  
Replace ribbon feed mechanism  
Replace space motor assy.  
6 – 16  
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8
Line feed trouble  
Turn the power off, and rotate the platen manually.  
Does the platen rotate smoothly?  
No  
Yes  
Is the platen gear (L) broken?  
No  
No  
No  
Yes  
Replace platen assembly  
Is the LF motor idle gear broken?  
Yes  
Replace the LF motor assembly or LF idle gear.  
Is the platen gear (R), idle gear or change gear broken?  
Yes  
Replace the gear.  
Set change lever to the rear position.  
Does the platen rotate smoothly?  
Yes  
No  
Replace tractor feed assembly.  
Replace LF motor assembly.  
Replace LF motor assembly.  
Remedied?  
No  
Yes  
End  
Replace Driver Board  
6 – 17  
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9
Malfunction of switch on operation panel  
Is the CN1 of operation panel connected to the CN3 on the Driver Board?  
Yes  
No  
Connect the cable properly.  
Replace operation Panel Board  
Remedied?  
No  
Yes  
End  
Replace Driver Board  
6 – 18  
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0
Data receiving failure  
Is the SEL LED blinking?  
No  
Yes  
Printer went into the print suppress mode.  
Wait until printer to receives DC1 code, or change the menu item “Print  
suppress-Ineffective” when the function is not required.  
Is the I/F RS232C?  
Yes  
No  
To step  
10-2  
Does the SEL LED light up?  
No  
Yes  
Press SEL key.  
Remedied?  
No  
Yes  
Does the printer receive data properly?  
Yes  
No  
To step 10-1  
End  
10-1  
Disconnect I/F cable  
Does the SEL LED light up?  
Yes  
No  
Change menu item I-prime to invalid, or check for defective cable.  
Replace Driver Board  
Remedied?  
Yes  
No  
End  
Replace I/F cable.  
6 – 19  
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10-2 (RS232C I/F)  
Is the correct cable used?  
No  
Printer I/F pin assignment.  
TXD  
RXD  
2 pin,  
3 pin,  
Yes  
SSD 11 pin,  
DTR 20 pin,  
Change I/F cable  
Is ALARM LED blinking?  
Yes  
DSR  
6 pin.  
No  
See tables 6.2 and 6.3 for the troubleshooting.  
Make sure of the parameters for RS232C in the menu are correct.  
Baud rate  
Bit length  
Parity  
Protocol  
Busy signal and its polarity  
Remedied?  
Driver Board  
No  
Yes  
End  
Is + 8V supplied on Driver Board?  
CN2  
20••••••••••••••••••  
Yes No  
0V (pin10)  
+8V (pin20)  
Remove RS232C I/F Board  
Is the + 8V supplied on the Driver Board?  
Yes  
No  
Replace RS232C I/F Board  
Replace Driver Board  
6 – 20  
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Replace RS232C Board  
Remedied?  
No  
Yes  
End  
Replace Driver Board  
6 – 21  
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APPENDIX A  
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APPENDIX A  
BIT IMAGE GRAPH IS — DOT DENSITY  
Double speed  
double density  
Double speed  
quad density  
Single  
Double  
1/144 inch  
D
D/2  
D/2  
D/4  
1/60 inch DOT  
1/120 inch DOT  
1/120 inch DOT  
1/240 inch DOT  
(No adjacent dots allowed)  
D = 1/60 inch  
APPENDIX A – 1  
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A. PCB LAYOUT  
PCB list  
(1) Circuit board SRXC (Control/Power Supply)  
(2) Circuit board SRXD (Driver)  
(3) Circuit board LEOP (Operation Panel)  
(1) Control/Power Supply Board (SRXC)  
Short Plug  
Setting  
Default  
SP1  
2 - 3  
1 - 2: 4 Mbit EPROM  
2 - 3: 1 M/2 Mbit EPROM  
SP4  
SP2  
SP3  
1
3
SP2 (A) - (B)  
and  
SP2  
SP3  
SP2 (A) - (B) and  
SP3 (A) - (B):  
SP3 (A) - (B)  
To use program ROM of Q1.  
SP2 (A) - SP3 (A) and  
SP2 (B) - SP3 (B):  
SP2  
SP1  
A
A
B
B
To use program ROM of Q2.  
SP3  
1 - 2  
SP4  
1 - 2: 2 - 3:  
No relation for any setting.  
Do not change default setting.  
1
3
(2) Driver Board (SRXD)  
(3) Operation Panel Board (LEOP)  
A – 1  
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APPENDIX B  
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B. SPARE PARTS LIST  
Quantity per year: Indicates the recommended number of each part that should be ordered for  
routine maintenance for one year for 500 units of printers and assuming that the printers are  
operated for 2 hours/day of 600 hours/year. The following codes are used to indicate the number  
of printers for which maintenance parts are ordered.  
B – 1  
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2
3
1
Figure 11-1 Upper Cover Assy  
B – 2  
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Figure 11-1 Upper Cover Assy  
Q'ty  
Required  
No.  
1
Part No.  
Description  
Q'ty  
Remarks  
1PP4128-1186P3  
1PP4128-1231P3  
Upper cover (N)  
Upper cover (W)  
1
1
2
2
For ML3390  
For ML3391  
2
3
1PA4094-7305G10 Sheet guide assy (N)  
1PA4094-7308G11 Sheet guide assy (W)  
1
1
2
2
For ML3390  
For ML3391  
2PA4128-1237G1  
2PA4128-1241G1  
Access cover assy (N)  
Access cover assy (W)  
1
1
2
2
For ML3390  
For ML3391  
B – 3  
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1
6
8
9
7
2
11  
3
5
4
10  
Figure 11-2 Printer General Assy  
B – 4  
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Figure 11-2 Printer General Assy  
Q'ty  
Required  
No.  
Part No.  
Description  
Q'ty  
Remarks  
1
2
2PP4025-2871P21 Platen Knob  
1
1
1
9
4YA4042-1545G302 Control/Power supply  
board (SRXC)  
Without ROM  
3
4
4YA4042-1544G1  
4YA4042-1516G4  
Driver board (SRXD)  
1
1
9
3
Operator panel board  
(LEOP)  
5
6
7
8
3PP4044-5360G3  
3YS4011-1266P1  
4YA4023-3101G1  
40085501  
Operation panel  
AC cord  
1
1
1
1
1
2
1
Print head (24)  
10  
10  
10  
Fuse 23702.5  
(125V 2.5A)  
Fuse 2151.25  
(250V 1.25A)  
For 120V  
4YB4042-1551P1  
For 230/240V  
9
4YB4049-7105P1  
4YB4049-7106P1  
4YB4049-7105P2  
4YB4049-7106P2  
Transformer assy  
(ML3390 120V)  
Transformer assy  
(ML3390 230/240V)  
Transformer assy  
(ML3391 120V)  
1
1
1
1
2
2
2
2
Transformer assy  
(ML3391 230/240V)  
10  
11  
3PB4050-3429P1  
40045601  
PCB plate  
FG plate  
1
1
2
2
B – 5  
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30  
23  
7
32  
35  
6
15  
34  
14  
5
33  
4
3
22  
13  
11  
20  
16  
17  
37  
18  
9
19  
12  
27  
2
8
10  
25  
21  
1
29  
31  
28  
24  
26  
36  
Figure 11-3 Printer Unit  
B – 6  
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Figure 11-3 Printer Unit  
Q'ty  
Required  
No.  
1
Part No.  
Description  
Q'ty  
Remarks  
3PA4044-5002G2  
3PA4044-5152G2  
Main Frame (N)  
Main Frame (W)  
1
1
2
2
For ML3390  
For ML3391  
2
3
3PP4044-5012P1  
Bottom paper end lever  
1
1
4PP4044-5019P2  
4PP4044-5019P1  
Pressure spring (F)  
Pressure spring (F)  
3
5
2
4
For ML3390  
For ML3391  
4
5
6
7
8
4PP4044-5031P2  
4PA4025-3327G1  
Roller holder (F)  
3
5
6
8
For ML3390  
For ML3391  
Front pressure roller assy  
3
5
6
8
For ML3390  
For ML3391  
3PP4044-5015P1  
3PP4044-5157P1  
Release shaft (N)  
Release shaft (W)  
1
1
2
2
For ML3390  
For ML3391  
1PP4044-5021P1  
1PP4044-5158P1  
Paper pan plate (N)  
Paper pan plate (W)  
1
1
2
2
For ML3390  
For ML3391  
3PP4025-3320P2  
3PP4025-3507P2  
Leaf spring (N)  
Leaf spring (W)  
1
1
2
2
For ML3390  
For ML3391  
9
3PP4044-5011P1  
3PP4044-5013P1  
4PP4025-3340P1  
3PP4025-3341P1  
4PP4044-5020P1  
Paper end lever  
Sensor lever  
1
1
1
1
1
1
2
2
10  
11  
12  
13  
Change gear  
Tractor gear  
Pressure spring (R)  
3
3
2
2
For ML3390  
For ML3391  
14  
15  
4PP4044-5163P1  
3PP4044-5033P1  
Pressure spring (W)  
Roller holder (R)  
2
1
For ML3391  
3
5
6
10  
For ML3390  
For ML3391  
16  
17  
18  
19  
20  
21  
22  
4PP4044-5017P1  
3PP4044-5014P1  
4PP4044-5024P1  
2PP4044-5016P1  
3PP4044-5023P1  
3PA4044-5110G2  
Change arm  
Switch lever  
Idle gear  
1
1
1
1
1
1
2
1
2
2
2
4
Change lever  
Reset spring  
LF motor assy  
3PP4044-5034P1  
3PP4044-5162P1  
Rear pressure roller (N)  
Rear pressure roller (W)  
1
1
2
2
For ML3390  
For ML3391  
B – 7  
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Figure 11-3 Printer Unit  
Q'ty  
Required  
No.  
23  
Part No.  
Description  
Q'ty  
Remarks  
3PA4044-5025G2  
3PA4044-5159G2  
Platen assy (N)  
Platen assy (W)  
1
1
3
3
For ML3390  
For ML3391  
24  
3PP4044-5010P1  
3PP4044-5156P1  
Space rack gear (N)  
Space rack gear (W)  
1
1
3
3
For ML3390  
For ML3391  
25  
26  
4PB4025-3377P2  
Rack tension spring  
1
1
3PP4044-5008P1  
3PP4044-5155P1  
Guide rail plate (N)  
Guide rail plate (W)  
1
1
1
1
For ML3390  
For ML3391  
27  
28  
3PP4025-2810P1  
Adjust cam  
1
1
4PP4044-5009P1  
4PP4044-5009P2  
Carriage shaft (N)  
Carriage shaft (W)  
1
1
1
1
For ML3390  
For ML3391  
29  
30  
3PP4044-5005P1  
FG plate (L)  
1
1
1
3PA4044-5050G2  
3PA4044-5165G2  
Pull-up roller assy (N)  
Pull-up roller assy (W)  
2
2
For ML3390  
For ML3391  
31  
32  
33  
34  
4PP4044-5116P1  
4PA4044-5041G2  
4PA4044-5043G2  
Idle gear (24)  
1
1
1
4
2
2
Tractor frame assy (R)  
Tractor frame assy (L)  
4PP4025-3335P3  
4PP4025-3335P4  
Drive shaft  
Drive shaft  
1
1
2
2
For ML3390  
For ML3391  
35  
36  
37  
3PP4044-5046P1  
4PB4044-5095P1  
3PP4044-5089P1  
Tractor sheet guide  
FG plate (A)  
1
1
1
2
2
2
For ML3391  
Change gear shaft  
B – 8  
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9
12  
8
6
10  
14  
11  
5
1
4
13  
3
7-1  
7-2  
Figure 11-4 Carriage Assy  
B – 9  
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Figure 11-4 Carriage Option Assy  
Q'ty  
Required  
No.  
Part No.  
Description  
Q'ty  
1
Remarks  
1
2
3
4
5
6
4PP4044-5061G1  
Carriage frame set  
2
4PA4025-3718G1  
4PP4025-3398P1  
3PP4044-5065P1  
4YA4044-5120G1  
Back up roller holder assy  
Guide roller  
1
1
1
1
2
2
2
4
Guide roller holder  
Space motor assy (24)  
7-1 3PB4044-5506P1  
3PB4044-5507P1  
Head cable (9N)  
Head cable (9W)  
1
1
5
5
For ML3390  
For ML3391  
7-2 3PB4044-5508P1  
3PB4044-5509P1  
Head cable (24N)  
Head cable (24W)  
1
1
5
5
For ML3390  
For ML3391  
8
3PB4025-1241P1  
3PA4044-5070G2  
3PP4044-5068P1  
4PP4044-5067P1  
3PP4044-5064P1  
4PP4025-3397P2  
4PP4044-5066P1  
PC connector (36/40)  
Gear cace assy  
1
1
1
1
1
1
1
2
3
1
1
2
1
1
9
10  
11  
12  
13  
14  
Head clamp holder  
Head plate  
Ribbon protector frame  
Back up roller holder spring  
Guide roller holder spring  
B – 10  
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[Pull-Tractor]  
2
1
3
[Bottom-Tractor]  
5
4
6
[I/F Board]  
7
Figure 11-5 Option Spare Parts  
B – 11  
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Figure 11-5 Option Spare Parts  
Q'ty  
Required  
No.  
1
Part No.  
Description  
Pull and bottom  
Q'ty  
1
Remarks  
4PA4025-3608G1  
2
2
tractor assy (L)  
2
3
4PA4025-3603G1  
Pull and bottom  
tractor assy (R)  
1
2PP4128-1239G1  
2PP4128-1243G1  
Tractor cover assy (N)  
Tractor cover assy (W)  
1
1
3
3
For ML3390  
For ML3391  
4
5
6
1PA4128-1277G1  
1PA4128-1277G2  
Bottom push stand (L)  
Bottom push stand (R)  
1
1
2
2
4PP4094-7385G1  
4PP4094-7386G1  
Paper knife (N)  
Paper knife (W)  
1
1
1
1
For ML3390  
For ML3391  
7
4YA4021-1050G1  
LXHI-PCB (RS232 I/F)  
1
3
B – 12  
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APPENDIX C  
RS-232C Serial Interface Board  
(Option)  
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APPENDIX C RS-232C SERIAL INTERFACE BOARD  
1. GENERAL  
This section describes the operation of the RS-232C Serial Interface board installed in the Printer  
as an option using a start-stop synchronization and serial communications circuit. This serial  
interface board is capable of transmitting and receiving simultaneously at speeds up to 19,200  
bits per second. Two protocols are available: printer Ready/Busy and X-ON/X-OFF modes.  
C – 1  
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2. OPERATION DESCRIPTION  
2.1 Element Description  
(1) 80C51 with MASK ROM  
An eight-bit microprocessor controller that controls the following:  
(a.) Serial interface protocol and data transfer through a serial port.  
(b.) Message buffer.  
(c.) Transmission of parallel data to the printer.  
(2) SN75189  
An RS-232C standard line receiver  
(3) SN75188  
An RS-232C standard line driver.  
(4) 2764  
An 8 kbyte ROM that contains the serial interface control program.  
(5) HM6264  
An 8192-byte static RAM used as a message buffer.  
2.2 Circuit Description  
A block diagram is shown in Figure C-2-1.  
C – 2  
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CN1  
80C51  
RST  
TD  
TD  
ADR latch  
RD  
RD  
IF WR  
2764  
ROM  
8 KB  
DB0 to DB9  
LS245  
RAM  
8 KB  
Serial data  
control line  
+5 VD  
+9 V  
±9 V power  
supply circuit  
10 VAC  
Bus line  
–9 V  
+5 V  
Control line  
+5V  
0V  
Figure C-2-1 Block diagram  
C – 3  
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2.2.1 Operation at power on  
After power is turned on, an RST OUT signal is sent from the printer control board to reset the  
printer. When the reset is canceled, the 80C51 CPU performs initialization. Initialization consists  
of setting the 80C51 timer, and setting the serial mode.  
2.2.2. RS-232C interface  
The DTR, SSD, TD and RTS signals output by the 80C51 are converted to RS-232C signals  
by line driver SN75188 (Q1) and sent to the interface.  
In addition, signals DSR, CTS, CD, and RD on the RS232C interface are converted to TTL level  
by line receiver SN75189 (Q2) and input to the 80C51.  
C – 4  
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2.3 Communication Procedure Flowchart  
2.3.1 Mode a  
Ready/Busy  
Received one  
character?  
No  
Yes  
Yes  
Is DSR valid?  
No  
DSR High?  
Yes  
No  
Yes  
Buffer overflow?  
No  
Parity error  
Error?  
No error  
Store the received  
character in buffer.  
Store 40 H in buffer.  
Is the  
printer in DESELECT  
state or is the paper  
low?  
Yes  
No  
Yes  
Yes  
Is remaining  
buffer space < 256?  
Is remaining  
buffer space > 256 during  
receive time out?  
No  
Has 200 ms or  
1s elapsed after SSD was  
turned on?  
No  
No  
Turn on the SSD signal.  
Yes  
Turn off the SSD signal.  
Yes  
Printer busy?  
No  
Output one character from the  
buffer to printer.  
Figure C-2-2  
C – 5  
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2.3.2 Mode b  
X-ON, X-OFF  
Received one  
character?  
No  
Yes  
Yes  
Is DSR valid?  
No  
DSR High?  
Yes  
No  
Yes  
Buffer overflow?  
No  
Parity error  
Error?  
No error  
Store the received  
character in buffer.  
Store 40 H in buffer.  
Is the  
printer in DESELECT  
state or is the paper  
low?  
Yes  
Yes  
No  
Is remaining  
buffer space < 256?  
Is remaining  
buffer space > 256 during  
receive time out?  
Yes  
No  
Has 200 ms  
elapsed after sending DC3 is  
turned on or has 1 second  
elapsed?  
No  
No  
No  
Yes  
Ready to send?  
Yes  
No  
Ready to send?  
Yes  
Send DC1.  
Send DC3.  
Yes  
Printer busy?  
No  
Output one character to printer.  
Figure C-2-3  
C – 6  
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3. TROUBLESHOOTING FLOWCHART  
3.1 Before Repairing a Fault  
Before servicing the printer, ask the customer in what situation the trouble occurred and record  
the response.  
Before starting troubleshooting, operate the printer in the same situation as that at the time of  
trouble occurrence to see if the same trouble occurs again. If not, perform the printers self test  
and thoroughly test the printers functionality. If the trouble is reproducible proceed to the  
troubleshooting section.  
3.2 Troubleshooting  
(1) The data is not received using a serial interface.  
(2) Using a serial interface, the print data is omitted or the print operation is not performed.  
C – 7  
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1
The data is not received using a serial interface.  
(A protocol is set to READY/BUSY state, and BUSY LINE is in SSD + state.)  
Is the OSC oscillation waveform as specified in Figure C-3-1?  
90ns  
+ 4 to + 5V  
V
0 to + 1V  
T (ns)  
Figure C-3-1  
No Replace the OSC.  
Yes Is a RST signal in Q3 is as specified in Figure C-3-2?  
5V  
0V  
Figure C-3-2  
No Check the RST circuit on the SRXC board.  
A
C – 8  
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A
Yes Are ALE, PSEN, RD, WR, signals as specified in Figure C-3-3?  
542ns  
180ns  
5V  
0V  
ALE  
5V  
0V  
PSEN  
271ns  
542ns  
RD/WR  
5V  
0V  
Figure C-3-3  
No Replace the Q3.  
Yes Are (T1) SELECT and (INTO) BUSY signals low level?  
No Check Q11 on the SKRA board.  
Yes Are +9V and -9V input to Q1?  
No Replace defective component in +9/–9 volt control circuit.  
Yes Is pin 1 SSD signal of Q3 High level?  
No Replace the Q3.  
Yes Is pin 11 SSD of Q1 low level?  
No Replace the Q1 or the CN1?  
Yes Is the RxD of Q3 as specified in Figure C-3-4?  
5V  
RxD  
0V  
ST bit  
SP bit  
5V  
0V  
SSD  
Figure C-3-4  
No Replace the Q2.  
Yes Replace the Q3.  
C – 9  
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2
In receiving by serial interface, printing data is omitted or printing operation is not performed.  
Are RxD and SSD of Q3 as specified in Figure C-3-4?  
No Replace the Q2.  
Yes Are, WR, and BUS signals of Q3 pin 3 as specified in Figure C-3-5?  
542ns  
5V  
0V  
WR  
5V  
0V  
Q3-3  
Figure C-3-5  
No Replace the Q3.  
Yes Is the level of a BUS signals at Q7 pins 2-9 the same as that of DB0-7 when  
WR signal is started?  
No Replace the Q7.  
Yes Is 4 pin of Q6 identical to WR signal in Figure C-3-5?  
No Replace the Q6.  
Yes Check Q7 (LSI: 10S0210-42) in the SRXD control PCB.  
C – 10  
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3.3 Local Test  
3.3.1 Circuit test mode  
3.3.1.1Setting  
(1) Diagnostic test (set by menu)  
(2) Test connector  
Connect the test connector shown in Figure C-3-6 to the interface connector  
2
3
TD  
RD  
4
RTS  
5
CTS  
CD  
Equivalent to Cannon DB-25P  
8
11  
20  
6
SSD  
DTR  
DSR  
Figure C-3-6 Test connector connection diagram  
3.3.1.2Function  
After the settings outlined in Section 3.3.1.1 are completed and power is turned on, the serial  
interface checks the message buffer memory and interface driver/receiver circuit. It then prints  
characters.  
To start and stop this test, push the SEL switch on the front of the printer.  
Details of this test are explained on the next page.  
C – 11  
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(1) The program revision using two numerical characters is printed.  
(2) “LOOP TEST” is printed.  
(3) Memory is checked for the message buffer.  
(4) Prints “OK” is printed if the memory check is OK and “BAD” is printed if the memory check  
fails.  
(5) Output level to DTR, RTS, and SSD signals is dropped low. If DSR, CTS, or CD signals  
is High, “IF BAD” is printed. If DSR, CTS, and CD signals are all Low, “IF OK” is printed.  
(6) Output level to DTR, RTS, and SSD signals is raised high. If DSR, CTS, or CD signals  
is Low, “IF BAD” is printed. If DSR, CTS, and CD signals are all High, “IF OK” is printed.  
(7) Transmits characters codes from 20H to 7FH is transmitted by SD signal. At the same  
time, characters are received by the RD signal and stored in the message buffer.  
(8) The characters that were stored in the message buffer as indicated in (7) are printed.  
(9) Steps (1) through (8) are repeated until test is interrrupted.  
C – 12  
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Oki Systems (Danmark) a.s.  
Oki Systems (Deutschland) GmbH  
Oki Systems (España) S.A.  
Park Alle 382  
Hansaallee 187  
40549 Dusseldorf  
Germany  
Tel : 0211 5266-0  
Fax : 0211 593345  
C/Goya 9  
DK-2625 Vallensbaek  
Denmark  
28001 Madrid  
Spain  
Tel : 436 66500  
Fax : 436 66590  
Tel : 91 5777336  
Fax : 91 5762420  
Oki Systems (France) S.A.  
Oki Systems (Holland) b.v.  
Oki Systems (Ireland) Ltd  
44-50 Avenue du General de Gaulle  
94240 L'Hay les Roses  
France  
Tel : 0146 158000  
Fax : 0141 240040  
Kruisweg 765  
The Square Industrial Complex  
Tallaght  
Postbus 690  
NL-2132 NG (2130AR)  
Hoofddorp  
The Netherlands  
Tel : 020 6531531  
Fax : 020 6531301  
Dublin 24  
Ireland  
Tel : 01 459 8666  
Fax : 01 459 8840  
Oki Systems (Italia) S.p.A.  
Oki Systems (Norway) A/S  
Oki Systems (Sweden) AB  
Centro Commerciale "II Girasole"  
PAT. Cellini-Lotto 3. 05/B  
20084 Lacchiarella (Milano)  
Italy  
Hvamsvingen 9  
P O Box 174  
Box 131  
S-163 55 Spanga  
Stormbyväegen 2-4  
Sweden  
N-2013 Skjetten  
Norway  
Tel : 02 900 261  
Tel : 0638 93600  
Fax : 0638 93601  
Tel : 08 7955880  
Fax : 08 7956527  
Fax : 02 900 7549  
Oki Systems (UK) Ltd  
Oki Europe Ltd  
Oki Europe Képviselet  
550 Dundee Road  
Slough  
Berkshire SL1 4JY  
United Kingdom  
Tel : 01753 819819  
Fax : 01753 819899  
Branch Office  
International Trade Center  
H-1075 Budapest  
International Bussiness Centre  
Pobrezni 3  
Bajcsy-Zsilinsszky út 12. 11. em. 204  
Hungary  
186 00 Praha 8  
The Czech Republic  
Tel : 02 232 6641  
Fax : 02 232 6621  
Tel : 361 266 6225  
Fax : 361 266 0152  
Oki Europe Ltd  
Oki (Europe) Ltd  
Oki (UK) Ltd  
Branch Office  
Central House  
3 Castkecary Road  
Wardpark North  
ul Grzybowska 80-82  
PL-00840 Warsaw  
Poland  
Balfour Road  
Hounslow  
Cumbemauld G68 0DA  
Scotland  
Middlesex TW3 1HY  
United Kingdom  
Tel : 0181 577 9000  
Fax : 0181 572 7444  
Tel : 02 6615407  
Fax : 02 6615451  
Tel : 01236 727777  
Fax : 01236 451972  
¡
People to People Technology  
Oki Data Corporation  
4-11-22, Shibaura, Minato-ku,  
Tokyo 108, Japan  
Tel: (03) 5445-6162 Fax: (03) 5445-6189  
M-521369 4-96 Printed in Japan  
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