SERVICE MANUAL SUPPLEMENT
for Model EM-C180
Microwave Oven
CAUTION
WARNING TO SERVICE TECHNICIANS
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING
SERVICING TO AVOID POSSIBLE EXPOSURE TO
EXCESSIVE MICROWAVE ENERGY
(a) Do not operate or allow the oven to be operated with the door open.
(b) Make the following safety checks on all ovens to be serviced before activating the magnetron or other
microwave source, and make repairs as necessary:
(1)Interlock operation, (2) proper door closing, (3) seal and sealing surfaces (arcing, wear, and other
damage), (4) damage to or loosening of hinges and latches, (5) evidence of dropping or abuse.
(c) Before turning on microwave power for any service test or inspection within the microwave generating
compartments, check the magnetron, wave guide or transmission line, and cavity for proper alignment,
integrity, and connections.
(d) Any defective or misadjusted components in the interlock, monitor, door seal, and microwave generation
and transmission systems shall be repaired, replaced, or adjusted by procedures described in this manual
before the oven is released to the owner.
(e)(i) A microwave leakage check to verify compliance with the Federal performance standard should be
performed on each oven prior to release to the owner. (For U.S.A)
(e)(ii) A microwave leakage check to verify compliance with the Canadian Regulation, HEALTH AND WELFARE,
SOR/79-920 should be performed on each oven prior to release to the owner. (For CANADA)
FORM # EM-C180 (02/05)
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CAUTION
For microwave energy emission
In the area emitting the highest reading, switch the
meter to SLOW RESPONSE and take a reading for
minimum of three (3) seconds. We recommended the
pattern outline shown below when the door surface is
surveyed.
On every service call. A check for micro-
wave energy emission must be made
according to the following manner.
NOTE: Periodically check to be sure that the probe tip
is not worn or dirty.
Measurement of energy emission
Measurement must be made with the microwave oven
operating at its maximum output and containing a load
The following U.S. standard applies to microwave ov-
ens:
of 275±15 milliliters of tap water initially at 20°±5°
celsius (68±9°F) placed within the cavity at the center.
21 CFR 1030.10, Performance Standard for Microwave
Ovens.
NOTE:The water container must be a 600 milliliter bea-
ker and made of an electrically none conduc-
tive material such as glass or plastic.
It requires that the power density of the microwave
radiation emitted by a microwave oven shall not ex-
ceed five (5) milliwatts per square centimeter at any
point 5 centimeters (about 2 inches) or more from the
external surface of the oven.
The cook tray must be in place when measuring
emission.
All microwave ovens exceeding the emission level of 4
mW/cm2 must be reported to Dept. of Service for mi-
crowave ovens and the manufacturer immediately.
The owner should be told not to use the microwave
oven until it has been repaired completely.
A properly operating door and seal assembly will nor-
mally register emission no greater than 4 mW/cm2 to
allow for measurement uncertainty with the cooking
shelf or tray in place.
All repairs must be performed in such a
manner that microwave energy emission
is minimal.
If a microwave oven is found to operate with the door
open, report to Dept. of Service, the manufacturer and
CDRH* immediately. Also tell the owner not to use the
oven.
Follow the instructions supplied with the detector be-
ing used and perform an R.F. emission test around the
door front, and all edges and vent of the outer case.
The cabinet (wrapper) must be in place and the oven
fully assembled.
When performing an emission survey, with the meter
on FAST RESPONSE, the movement of the detector
probe shall not exceed one (1) inch per second.
*CDRH: Center for Device and Radiological Health.
The interlock monitor switch acts as the final safety
switch protecting the customer from microwave radia-
tion. If the interlock monitor switch operates properly
and the door interlock switch fails, the fuse will blow.
If this happens, all interlock switches must be replaced.
The contacts of the interlock switches may be welded
together.
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- TABLE OF CONTENTS -
Adjustment Procedures............................................. 1
Test Procedures and Troubleshooting...............4 •`10
Disassembly Instructions .............................. 11•`14
Exploded View and Parts List ........................ 15•`22
Overall Circuit Diagram.................................23 •`25
Specifications............................................................ 2
Power output Measurement ...................................... 2
Precautions and Repair Service Tips ....................... 2
Circuit Diagram ......................................................... 3
1. ADJUSTMENT PROCEDURES
(All service adjustments must be made for minimum
microwave energy leakage readings.) (For Canada)
TO AVOID POSSIBLE EXPOSURE TO MICROWAVE
ENERGY LEAKAGE, THE FOLLOWING ADJUST-
MENTS OF THE INTERLOCK SWITCHES SHOULD
BE MADE ONLY BY AUTHORIZED SERVICE PER-
SONNEL.
NOTE: If the interlock monitor circuit operates and at
the same time the fuse blows with the door
open, be sure to replace the relay circuit board
, Interlock switch and monitor switch.
The service center should have the designated
detector to measure the microwave energy
leakage after the repair or adjustment.
NOTE: Detector to be used at the service center is
NARDA 8100, 8200 or the equivalent.
INTERLOCK SWITCH, INTERLOCK MONITOR
SWITCH AND DOOR SENSING SWITCH ADJUST-
MENT
Lever stopper
Interlock monitor
switch
(Figure 1)
(1) Loosen 2 screws securing the lever stopper.
(2) Adjust the lever stopper position so that it is pushed
up and pulled backwards until there is zero gap
between the latch lever and the switch body on the
interlock switch. At the same time there is zero gap
between the latch lever and the switch body on the
door sensing switch when the door latch is securely
locked.
Latch Lever
(3) Tighten the lever stopper screws securely.
(4) Make sure the interlock monitor switch closes
after the interlock switch opens when the door is
opened very slowly, according to “CHECKOUT
PROCEDURE FOR SWITCHES” on page 6.
(5) Make sure the interlock monitor switch opens
before the interlock switch closes when the door is
closed very slowly, according to CHECKOUT PRO-
CEDURE FOR SWITCHES” on page 6.
Interlock
switch (Secondary
interlock switch)
Latch Lever
(6)(i) Make sure the microwave energy leakage should
be no greater than 4 mW/cm2 to allow to measure-
ment uncertainty when measured with a detector.
(All service adjustments must be made for mini-
mum microwave energy leakage readings.) (For US)
(6)(ii) Make sure the microwave energy leakage is
below the limit of 1 mW/cm2 (at 275cc water load),
5 mW/cm2 (at no load) and 5 mW/cm2 (at 275 cc
water load without cabinet) when measured with a
detector.
Door sensing
switch
(Primary interlock
switch)
Screws
Figure 1
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2.SPECIFICATIONS
A. SINCE NEARLY 4,000VOLTS EXISTS IN SOME
CIRCUITS OF THIS MICROWAVE OVEN, RE-
PAIRS SHOULD BE CARRIED OUT WITH
GREAT CARE.
B.TO AVOID POSSIBLE EXPOSURETO MICRO-
WAVE ENERGY LEAKAGE,THE FOLLOWING
PRECATIONS MUST BETAKEN BEFORE SER-
VICING.
Microwave output ................ 1,800W to 180W
Frequency ........................... 2,450MHz
Power supply .......................208V, 60Hz
Rated current ...................... 13 Amp.
Safety Device ......................
Thermal protector(Magnetron) 150°C(270°F)Open
(Thermostat)
Thermistor (Magnetron)
80°C(144°F)Close
200°C(360°F) Open
108°C(194°F)Close
(1) Before the power is applied.
(a) Open and close door several times to make
sure the interlock switch, door sensing switch
and interlock monitor switch operate properly.
(Listen for the clicking sound from switches.)
Make sure the interlock monitor switch is
closed after the interlock switch and door sens-
ing are open when the door is opened.
(See pages 1 and 6)
(b) Make sure the perforated screen and the choke
dielectric of the door are correctly mounted.
(2) After the power is applied.
(a) Open and close the door to see if the interlock
mechanism operates properly.
Thermistor(Duct)................120°C(216°F) Open
Fuse (Cartridge Type) ................. 250V 10A
Micro switch, Relay
Interlock Switch
Interlock monitor Switch
Door sensing Switch and
Relay RL-3 and 4
Max. input time ....................Electronic Digital, up to
Manual 10min./Memory 30min.
Overall Dimensions........422(W)x540(D)x335(H) mm
Oven cavity size ............330(W)x330(D)x230(H) mm
Effective Capacity of Oven Cavity.........19.1liters
Net weight ...........................32Kg
(b) Check microwave energy leakage with a leak-
age detector and confirm the energy leakage
is below 5mW/cm2
3. POWER OUTPUT MEASUREMENT
NOTE: The power output specification, 1800W on this
model is measured with IEC measurement. The power
output is measured with two(2) liters water is equiva-
lent to 1800W in measurement with IEC, when mea-
sured with the following power output.
(1)1. Fill two beakers, one liter of tap water respec-
tively
(3) Do not operate the unit until it is completely
repaired of any of the following conditions.
(a) Door is not closed firmly against the cavity
front.
(b) The hinge is broken.
(c) The choke dielectric or the door seal is dam-
aged.
(d) The door is bent or warped, or there is any
other visible damage to the oven that may
cause microwave energy leakage.
2. Use an accurate thermometer and measure each
water temperature respectively.
(2) Place beakers side by side in center of the
ceramic tray.
(3) Close the door,set the “TIME” for two minutes.
Touch the “START” key and heat the water for
exactly two minutes.
(4)Take the beakers out, immediately stir the water
and measure the water temperatures respectively.
(5) Calculate the temperature rise of water in each
beaker. Then calculate the average value of the two
temperature rises.( Ģt)
Note: Always keep the seal clean.
(e) Make sure that there are no defective parts in
the interlock mechanism.
(f) Make sure that there are no defective parts in
the microwave generating and transmission
assembly. (especially wave guide).
(4) The following items should be checked after
the unit is repaired.
(a) The interlock monitor switch is connected cor-
rectly and firmly.
(6) The teperature rise shall be in the following range;
Average Temp. Rise
(b) The magnetron gasket on the magnetron is
properly positioned.
Minimum
Maximum
23.1°C
28.3°C
(c) Waveguide and oven cavity are intact. (No
leakage of microwave energy).
Power output is affected by the line voltage under load.
(7) For correct Power output measurement, the line
voltage under load must be 208±2Volts.
(d) The door can be properly closed and the safety
switches work properly.
(e) The oven must be stopped when the door is
opened or the time is up.
The oven must not be operated with any of the above
components removed or bypassed.
4.PRECATIONS AND REPAIR SERVICE TIPS
PRELIMINARY
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6.TEST PROCEDURES AND TROUBLESHOOTING
PRIMARY
CAUTION
WINDINGS
-DISCONNECT THE POWER SUPPLY CORD FROM THE WALL
OUTLETWHENEVER REMOVINGTHE CABINET FROMTHE UNIT.
PROCEED WITH TESTS ONLY AFTER DISCHARGING THE HIGH
VOLTAGE CAPACITORS AND REMOVING THE LEAD WIRES ON
THE PRIMARY WINDING OF THE HIGH VOLTAGE TRANSFORM-
ERS FOR LOWER AND UPPER MAGNETRONS.
Secondary
Windings
Filament
Windings
(SEE FIGURE 3)
A.TEST PROCEDURES
Figure 3
COMPONENT
CHECKOUT PROCEDURE
RESULT
1) Check for resistance: Across the filament ter- Normal reading:
minal of the magnetron with an ohm - meter
on Rx1 scale.
Less than 1 ohm.
MAGNETRON
Figure 4
2) Check for resistance: Between each filament Normal reading:
terminal of the magnetron and the chassis
ground with an ohm-meter on highest scale.
Infinite ohms.
Figure 5
1) Measure the resistance:
With an ohm-meter on R x1 scale.
a. Primary winding;
Normal reading:
HIGH-VOLTAGE
TRANSFORMER
Approximately 1.0 ohms
Less than 1 ohm.
b. Filament winding;
c. Secondary winding;
Approximately 60 ohms
Normal reading:
2) Measure the resistance:
with an ohm-meter on highest scale.
a. Primary winding to ground;
b. Filament winding to ground;
Infinite ohms.
Infinite ohms.
Figure 6
Note: Remove varnish of measured point.
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COMPONENT
CHECKOUT PROCEDURE
Measure the resistance: Across two terminals with Normal reading:
an ohm-meter on highest scale. Momentarily indicates several ohms, and
RESULT
HIGH-VOLTAGE
CAPACITOR
Including internal
bleeder
gradually to 10 meg-ohms.
Abnormal reading:
Indicates continuity or 10 meg-ohms
from the beginning.
resistor
Figure 7
Measure the resistance: Across two terminals with Normal reading:
an ohm-meter on highest scale. Indicate about middle position in one
HIGH-VOLTAGE
DIODE
direction (forward) and infinite ohms in
the reverse direction, using ohm meter
with a 9V battery.
NOTE
- Some digital meter may show more
than 0 ohms or infinite ohms even in a
forward direction because the low mea-
suring voltage of the meter does not
allow the meter to pass through the high
voltage diode. Use an ohm meter with
a 9V battery.
Abnormal reading:
Indicates continuity or infinite ohms in
both directions.
Figure 8
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COMPONENT
CHECKOUT PROCEDURE
RESULT
When
When not
Measure the resistance between terminals of
FPC connector after removing it from
S101.(Figure 10)
Resistance touched touched
TOUCH KEY
BOARD
Value
Less than More than
1 K ohms 1 meg ohms
NOTE
- When reconnecting the FPC connector, make
sure the holes on the connector are properly
inserted in hook of the plastic fastener in S101.
MATRIX CIRCUIT FOR
When checking the POWER key ,
connect the ohm-meter as illustrated
below.
TOUCH KEY BOARD
FPC CONNECTOR
TERMINAL OF FPC CONNECTOR
FIGURE 10
CHECKOUT PROCEDURE FOR SWITCHES
Disconnect the lead wires from the switches and check for the continuity of the switches, connecting an ohm-meter
to its terminals.
SWITCHES
(SEE Figure 1 on page 1)
CHECKOUT PROCEDURES
DOOR OPEN
DOOR CLOSED
INTERLOCK SWITCH
Terminals "COM" and "NO"
DOOR SENSING SWITCH
INTERLOCK MONITOR
SWITCH
Terminals "COM" and "NC"
CAUTION: After checking the switches, make sure that the interlock monitor switch is properly connected according
to the CIRCUIT DIAGRAM on page 3.
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WARNING:
Primary
Winding
When removing the cabinet, you must disconnect
the power supply cord from the wall oulet for your
safety. Only the checkout procedure below needs
the power supply on.TAKE GREAT CARE to avoid
possible electrical shock.
Primary
Winding
For your safety, proceed with the test only
after removing the wire leads from the pri-
mary winding of the high voltage transformer
Lower
Upper
COMPONENT
CHECKOUT PROCEDURE
RESULT
Normal reading:
Check voltage at S104 and S105 after remov-
ing each connector (female) from power circuit
board.
POWER
P.C.B
Connection
Pin No.,
S105
Voltage(V)
DC 12
Pin No.3 (Ground) and 4,5, 1,2 at S105.
Pin No.1 and 2 at S104.
#3 to #4
#3 to #5
#3 to #1
#3 to #2
DC 16
DC 30
DC 35
CAUTION:
For your safety, proceed with the test only
after removing the wire leads from the pri-
mary winding of high voltage transformer.
Test procedures:
a) Make sure that the power supply cord is not
plugged in.
S104
#1 to #2
AC 2.4
b) Remove the connector S104 and S105 from
the power circuit board.
c) Plug the power supply cord : back in.
d) And then, measure each voltage.
Measure the voltage: Between test points TP-1,
TP-2 ,TP-3 and ground (See figure 16 on page
23)
CONTROL
P.C.B
Test point
TP,
Voltage(V)
Note
TP-1
TP-2
TP-3
TP-4
DC - 5
DC - 12
DC - 16
DC - 35
- Proceed with the check of the control P.C.B to
see if any one of the measured values is differ-
ent from the specified values.
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B.TROUBLESHOOTING
CONDITION
TROUBLE
CHECK
RESULT
Shorted
REMEDY
Replace
Power with normal
voltage is applied. Place
a cup of water inside
microwave oven
Step down
Transformer
* “TIME”,”1”,”0” ,”0”
and “START” keys
are touched
Fuse(10A) blows
off immediately
Replace
H.V Capacitor
Shorted
Connection of FPC
from Touch key
board
Incorrect
Reconnect
No display
cooking time
Power circuit board
(See page 7)
Voltage
incorrect
Replace
Replace
Replace
Touch key board
(See page 6)
Resistance
incorrect
Voltage
incorrect
Control circuit
board
(See page 7)
Door sensing
switch
(See page 7)
No continuty
No continuty
Replace
Replace
Replace
Cooking ope-
ration will not
start
Interlock switch
(See page 7)
Control circuit
board
(See pages 7 & 23)
Voltage
incorrect
Oven does not
heat up
See “HINT” on page
10
* Note:Oven will not accept settings of 60 through to 99 seconds.
TIME must be entered as 1 minute and 39 seconds for 99 seconds.
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CONDITION
TROUBLE
CHECK
RESULT
REMEDY
Low microwave
output
Magnetron
See “HINT”
on page 10
Poor
oscillation
Gear motor
Rotation has
stopped.
Uneven heating
Rotation of top or
bottom antenna
Repair or
replace
°
C. ERROR INDICATION
The Display will show an error indication for self-diagonosis as follows.
“E” means that a service technician is required .
“U” means that user can correct the operation.
Display
E-21
Trouble
Other Symptom
Solution
Oven stops heating.
Buzzer continuously beeps.
Blower motor will stop
immediately.
Thermistor (on duct) sensies
a temperature of 120°C or
higher.
Check and remove the cause of the cav-
ity fire or abnormal overheating.
This error function will be cancelled when
the power cord is unplugged.
Oven stops heating.
Buzzer does not beep.
Blower motor will stop
immediately.
Check for short-circuit of thermistor
itself or wire insulation of thermistor.
This error function be cancelled when the
power cord is unpluged.
Thermistor (on Magnetron) or
thermistor (on Duct) is
shorted.
E-31
E-32
Oven stops heating.
Buzzer does not beep.
Blower motor is operated.
Thermistor (on Magnetron) or
thermistor (on Duct) is opened.
Check for open-circuit of thermistor
itself or improper connection of wire
socket of thermistor.
This error function be cancelled when the
CLEAR key is touched.
Thermistor (on Magnetron)
senses a temperature of 200°C Buzzer continuously
or higher.
Oven stops heating.
Check and remove cause of abnormal
overheating (such as operation with
no food).
This error function will be cancelled when
the CLEAR key is touched.
U-10
U-50
beeps.
Blower motor will stop
immediately.
(Remark:
The key for “Start” is not
touched within 1 minute after
the door is opened or closed .
This error function will be cancelled
when the door is opened and closed.
The purpose of this func-
tion is to avoid accidental
operation while the user is
not attempting to operate
the oven.)
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THERMISTOR CHART
Duct
8000
7000
6000
5000
4000
3000
2000
1000
0
Magnetron
Thermistor connector
0
10
20
30
40
50
60
Temperature Ž
“HINT”
PROCEDURE FOR DETERMING WHETHER THE UPPER MAGNETRON CIRCUIT OR LOWER MAGNETRON
CIRCUIT IS DEFECTIVE.
SYMPTOM:One magnetron does not work giving less than normal heat.
Caution:
Make sure that cabinet (outer wrap) and rear plate are not removed from the oven for your safety.
1.Operate oven as follows.
1)Place a cup of water in the oven
2)Close the door.
3)Touch “CLEAR”, “TIME”, “5”, “0” and “START” keys to operate the oven for 50 seconds with full power level.
2. Determine if the Exhaust air is warm in the following positions..
1)Put your hand near the exhaust duct outside of the rear plate to feel the exhaust (Never remove
the cabinet and rear plate from the oven for your safety when you put your hand near exhausting duct.)
2)If air from the upper position of the duct is not warm,the upper magnetron circuit is defective.
If air from the lower position of the duct is not warm,the lower magnetron circuit is defective.
Cabinet(outer wrap)
Rear Plate
Upper position
Rear Plate
Lower position
Exhaust Duct
Figure 11
The H.V Transformer for
operating the upper Magnetron
is located on the inside of the
rear plate
The H.V Transformer for
operating the lower Magnetron
is located on the inside of the
rear plate
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7. DISASSEMBLY INSTRUCTIONS
- THE OVEN MUST BE DISCONNECTED FROM THE
ELECTRICAL OUTLET WHEN MAKING REPLACE-
MENTS, REPAIRS, ADJUSTMENT OR CONTINUITY
CHECKS. BEFORE PROCEEDING WITH ANY RE-
PAIR, WORK , WAIT AT LEAST 1 MINUTE, UNTIL
THE CAPACITOR INTHE HIGHVOLTAGE AREA HAS
FULLY DISCHARGED.
- If the interlock switch, the relay RL-3 and RL-4 or the
interlock monitor switch operate properly, determine
which of the following is defective : control circuit board,
high voltage transformer, high voltage capacitor, high
voltage diode or magnetron.
D. REMOVING DISPLAY CIRCUIT BOARD
(1) Disconnect all lead wires on the Control panel
from the Control PCB and Power PCB.
(2) Remove 4 screws securing the Control panel
Ass’y to the oven cavity.
A. REMOVING INTERLOCK SWITCH
(See Figure 1 on page 1)
(1) Disconnect all lead wires from the interlock
switches.
(2) Remove 2 screws securing the lever stopper.
(3) Remove 1 screw securing the switches.
Then pull out the switches.
(4) Make the necessary adjustment, and perform a
microwave energy leakage check according to
“1. ADJUSTMENT PROCEDURE FOR
SWITCHES” on page 1. Check proper operation
according to “CHECKOUT PROCEDURE FOR
SWITCHES” on page 6.
(3) Push up and pull out the Control panel Ass’y.
(4) Remove 4 screws securing the Display PCB.
(5) Take out the Display PCB and push up the lever
end of the plastic fastener and remove the FPC
connector from the connector socket S101.
CAUTION:
When replacing new Display PCB please ensure
that all 10 LED heads are positioned exacty into
the square holes of the control frame at once.
Never force any LED head into the PCB.
B.REMOVING INTERLOCK MONITOR AND DOOR
SENSING SWITCH
(See Figure on page 1)
(1) Disconnect all lead wires from the interlock moni-
tor switch and door sensing switch.
(2) Remove 1 screw securing the these switches.
Then pull out the switches.
(3) Make the necessary adjustments or replace-
ment of the switch by reversing step (2) and
check microwave energy leakage according to
“1. ADJUSTMENT PROCEDURE FOR
SWITCHES” on page 1. Check proper operation
according to “CHECKOUT PROCEDURE FOR
SWITCHES” on page 6.
E. REMOVING MAGNETRONS
(1) Remove 1 screw securing the thermal
protector .
(2) Disconnect 2 lead wires from the magnetron
terminals .
(3) Remove thermistor (lower magnetron) by
pulling horizontally.
(4) Remove 4 hex nuts (upper magnetron) or 2 hex
nuts (lower magnetron)securing to the
waveguide.
(5) Remove magnetrons.
(6) Take out the magnetron VERY CAREFULLY.
WHEN REPLACING ANY DOOR MICROSWITCH,
REPLACE ONLY WITH THE SAME SWITCH SPECI-
FIED ON THE PARTS LIST.
NOTES
- When removing the magnetron, make sure that its
dome does not hit any adjacent parts, or it may be
damaged.
- When replacing the magnetron, be sure to install the
magnetron gasket in the correct position and be sure
that the gasket is in good condition.
- After replacing the magnetron, check the microwave
energy leakage to ensure it is below the limit of
5mW/cm2. (For US)
C. REMOVING FUSE
Remove the 10A fuse with screwdriver.
NOTES
- When replacing the 10A fuse, be sure to use the
exact repair part.
- If the 10A fuse blows immediately, check the primary
and secondary interlock switch, the relays RL-3 and
RL-4 (on the control circuit board) and the interlock
monitor switch according to “CHECKOUT PROCE-
DURE FOR SWITCHES” on page 6. Make sure to check
the microwave energy leakage according to “1. AD-
JUSTMENT PROCEDURE FOR SWITCHES” on page
1, when the primary and secondary interlock switches,
the relay RL-3 and RL-4 or the interlock monitor switch
is adjusted or replaced.
- After replacing the magnetron, be sure to check the
microwave energy with a leakage detector and
confirm it is below the limit of 1 mW/cm2 (at 275cc
water load),5 mW/cm2 (at no load) and 5 mW/cm2
(at 275 cc water load without cabinet) when measured
with a detector. (For CANADA)
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HINT FOR LAMP-CHANGE
NOTES
Before removing the bulb access panel, pull out
the main-plug. Change the faulty bulb and secure
the bulb access panel. Plug the cord back in and
check operation.
- After replacing the door, be sure to check that the
interlock switch, the door sensing switch
and the interlock monitor swich operate normally.
(See pages 1 and 6)
- After replacing the door, check for microwave ene-
rgy leakage with a leakage detector. Microwave
energy leakage must be below the limit of
5mW/c ‡u.(For US)
F. CHANGING POWER SUPPLY CORD
(See exploded view on page 15)
- After instaling the door, check for microwave
energy with a leakage detector and confirm that the
leakage is the below the limit of 1 mW/cm2 (at 275cc
waterload),5 mW/cm2 (at no load) and 5 mW/cm2
(at 275cc water load without cabinet) . (For CANADA)
(1) Unfasten 1 screw for ground and pull out the
2 wires of the power cord from the terminal plate.
(2) Remove 1 screw for the bottom bracket of the
cord bushing.
(3) Install the new power supply cord with the
reverse procedure of above (1) to (2).
I.HOW TO RESET THE MEMORY OF ACCUMU-
LATIVE COOKING TIME
1. Push the keys step by step as follows,
“ CLEAR “, “ TIME “, “ 8 “, “ 8 “, “ 8 “, “ 1 “
“ START “, “ START “.
WARNING:
For changing the power supply cord, never use
other than the following.
The display will show accumulative cooking time
in display window.
Key No. Order No.
Parts Name
Power cord Ass’y
Cord bush
5
6
7
617 140 1318
617 140 1332
617 140 1349
2. Then push the keys as follows.
“ 0 “, “ MEMORY “.
The Memory of Accumulative cooking time will be
cleared.
Bottom bracket
G. REMOVING CERAMIC TRAY ASS’Y
(See Fig.12 )
(1) Take off the cabinet.
(2) Put (insert) a screwdriver in the 9 mm diameter
hole located at the lower hinge of left side of the
oven cavity. Push the tray up with the screw-
driver.
(3) Open the door and take out the tray very care-
fully.
J.RELEASINGTYPE CONNECTOR
This oven is provided with locked type connectors.
When you remove a connector, pull the connector while
releasing the lock by pressing “A” point shown below.
Do not pull the wire of the connector.
Connector:
S1, S2, S102, S104, S105 (Figure 13)
Door
A
A
Hole
Figure 13
Figure 14
Pull connector case (Never pull the wire)
Screw driver
Figure 12
H.REMOVING DOOR
Remove 2 hex nuts securing the upper hinge,
remove 3 hex nuts securing the lower hinge and
remove 1 special screw securing the door arm
(located at the bottom of the door sash).
Figure 15
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K. ADDITIONAL FUNCTIONS
The following functions can be completed by the key operation described below.
The Accumulative cooking time and the number of door opening /closings can be observed.
The Type and level of the buzzer sound can be selected. The “display of remaining cooking time when
cooking is temporarily stopped due to door opening” can be selected. The “Accumulative cooking time
period” will inform the service technician of the life expectation of the magnetron or other parts.
Key Operation Step
OPERATION
KEY
DISPLAY WINDOW
1
2
3
•
•
•
Press CLEAR / STOP key.
CLEAR
STOP
LOW MED. HIGH
TIME
Press TIME key.
LOW
MED. HIGH
8
Press 8 three times.
LOW MED. HIGH
Key operations at Step 1 thru Step 3 are common to all functions. Proceed with the key
operation at Step 4 for your desired functions.
• Select the function to press the number key
1 ... Accumulative cooking time.
2 ... The number of door operations. (See “HINT” at Step 6)
3 ... Indication of remaining cooking time (when cooking
is interrupted by door opening).
4 ... To cancel remaining cooking time.
5 ... Tone of the buzzer on cooking completion. (Pip,
Pip, Pip)
4
1
6 ... Tone of the buzzer on cooking completion. (Peep)
LOW MED. HIGH
7 ... The buzzer off.
8 ... The buzzer on.
e.g. Number 1 key is pressed for “Accumlative cooking time
period”
•
•
Press START key.
All 4 digits will be flashing.
START
START
5
LOW MED. HIGH
•
•
•
Press START key again.
The number “215”shows total cooking time in hours.
When number key other than 1 or 2 is pressed at step 4,
“0” appears in display window and the setting has been
completed.
6
LOW MED. HIGH
LOW MED. HIGH
LOW MED. HIGH
Note:When number “2” is depressd at Step 4 above the
displayed figure shows the number of door operation ••100
e.g. “20” displayed=2000 door operations.
•
Press CLEAR / STOP key to clear the display for the
option 1 and 2. • The function is cleared and “0” will
appear in the display window.
CLEAR
STOP
7
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Maintenance:
The microwave ovens are designed, manufactured, and tested for years of dependable operation. However, the
oven may require service from time to time if the consumable components listed below are not replaced at the
appropriate time. For protection from unexpected service calls and undue inconvenience, we recommend that
the user has the listed parts replaced at the intervals below, (at customer cost).
This will avoid the trouble of repeated service calls after the expiration of the warranty period.
Consumable components:
When more than 1,250 hours of accumulative cooking time or more than 200,000 cycles of door opening/closing
is observed by key operations (See page 13 for more information), the following consumable components should
be replaced.
(Maintenance light in window display indicates when accumulative cooking time reaches 1,250 hours.)
Light
1. Magnetron Tube, Part No. 415 002 6408
2. Printed Circuit Board-Relay, Part No. 617 137 3844
3. Switch base Assembly, Part No. 617 205 1208
4. Door Latch, part No. 617 068 1087
When more than 2,000 hours of accumulative cooking time is observed, the following consumable compo-
nents should be replaced.
5. Blower motor, Part No. 617 140 1370
When slow rotating of blower motor is observed after removing dust from blower motor, blower motor must
be replaced.
6. Door hinge, Part No. 617 120 3028
When a worn door hinge is observed and proper door adjustments can not be made, the door hinge must
be replaced.
7. Door Assembly, Part No. 617 178 0734
When a worn door pin is observed and proper door adjustments can not be made, the door assembly must
be replaced.
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8. EXPLODED VIEW AND PARTS LIST
Main body Parts-1
NOTE: All component have special characteristics for safety and must be replaced using parts listed in this
manual. All service on M/W ovens should be performed by a qualified technician using approved testing
equipment. Customers should not attempt replace component marked with a
symbol.
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NOTE: All component have special characteristics for safety and must be replaced using parts listed in this
manual. All service on M/W ovens should be performed by a qualified technician using approved testing
equipment. Customers should not attempt replace component marked with a
symbol.
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Main body Parts-2
NOTE: All component have special characteristics for safety and must be replaced usnig parts listed
in this manual.
All service on M/W ovens should be performed by a qualified technician using approved testing
equipment. Customers should not attempt replace component marked with a
symbol.
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NOTE: All component have special characteristics for safety and must be replaced using parts listed
in this manual.
All service on M/W ovens should be performed by a qualified technician using approved testing
equipment. Customers should not attempt replace component marked with a
symbol.
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