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CHAPTER 7.
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
[1] WARNINGS
Microwave ovens contain circuitry capable of producing very high voltage and current, contact with following parts may result
in severe, possibly fatal, electric shock.
(Example) Inverter unit, Magnetron, High Voltage Harness etc..
Avoid possible exposure to microwave energy. Please follow the instructions below before
WARNING:
operating the oven.
1. Disconnect the power supply cord.
2. Visually check the door and cavity face plate for damage
(dents, cracks, signs of arcing etc.).
Carry out any remedial work that is necessary before operat-
ing the oven.
Do not operate the oven if any of the following conditions exist;
1. Door does not close firmly.
2. Door hinge, support or latch hook is damaged.
3. The door gasket or seal is damaged.
4. The door is bent or warped.
To prevent an electric shock, take the following precau-
tions.
1. Before wiring,
1) Disconnect the power supply cord, and then remove
the outer case and the back plate assembly.
2) Open the door and block it open.
3) Wait for 60 seconds to discharge the high voltage ca-
pacitors of the inverter unit.
4) Disconnect the high voltage wire from the magnetron
terminal with insulated pliers.
5) Make the terminal (metal part) of the high voltage wire
contact to the magnetron body with insulated pliers.
6) Now, the capacitors of the inverter unit are discharged.
7) Reconnect the high voltage wire to the magnetron ter-
minal after discharging.
WARNING : Use the pliers that the portions of their
handles are insulated completely to
avoid an electric shock.
Please refer to "OVEN PARTS, CABINET PARTS, CONTROL PANEL PARTS, DOOR PARTS", when carrying out any of the following removal proce-
dures:
[2] OUTER CASE REMOVAL
To remove the outer case, procedure as follows.
1. Disconnect the power supply cord.
2. Wait for 60 seconds to discharge the high voltage capacitors of the
inverter unit.
3. Open the oven door and block it open.
4. Remove the one (1) screw holding the steam cap to the outer case
cabinet (back side).
5. Remove the seven (7) screws from the rear side of outer case.
[3] BACK PLATE REMOVAL
1. Disconnect the power supply cord.
2. Remove the outer case cabinet, referring to "OUTER CASE
REMOVAL".
WARNING AGAINST HIGH VOLTAGE:
WARNING FOR WIRING
Service Manual
5. There are defective parts in the door interlock system.
6. There are defective parts in the microwave generating
and transmission assembly.
7. There is visible damage to the oven.
Do not operate the oven:
1. Without the RF gasket (Magnetron).
2. If the wave guide or oven cavity are not intact.
3. If the door is not closed.
4. If the outer case (cabinet) is not fitted.
2. Do not let the wire leads touch to the following parts;
1) High voltage parts:
Magnetron, Inverter unit and High voltage capacitor .
2) Hot parts:
Oven lamp, Magnetron, Inverter unit and Oven
cavity.
3) Sharp edge:
Bottom plate, Oven cavity, Waveguide flange and
other metallic plate.
4) Movable parts (to prevent a fault)
Fan blade, Fan motor, Switch, Switch lever.
3. Do not catch the wire leads in the outer case cabinet.
4. Insert the positive lock connector until its pin is locked and
make sure that the wire leads do not come off even if the
wire leads are pulled.
5. To prevent an error function, connect the wire leads
correctly, referring to the Circuit Diagram.
6. Slide the entire outer case back out about 1 inch (3 cm) to free it
from retaining clips on the cavity face plate.
7. Lift entire outer case from the unit.
8. Now, the outer case with the steam cap is free.
CAUTION: DISCONNECT OVEN FROM POWER SUPPLY BEFORE
REMOVING OUTER CASE.
WAIT FOR 60 SECONDS BEFORE TOUCHING ANY
OVEN COMPONENTS OR WIRING.
3. Open the oven door and block it open.
4. Remove the one (1) screw holding the side angle to the back plate.
7 – 1
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