Component Replacement And Adjustment Procedure - Sharp R-8000G Service Manual

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

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)
High Voltage Capacitor, Power Transformer, Magnetron, High Voltage Rectifier Assembly, 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. Make sure that a definite" click" can be heard when the
microwave oven door is unlatched. (Pull down the door
handle in a closed position with one hand, then push the door
with the other, this causes the latch leads to rise, it is then
possible to hear a "click' as the door switches operate.)
3. 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 operating
the oven.
Do not operate the oven if any of the following conditions exist;
1. Door does not close firmly.
To prevent an electric shock, take the following precautions.
1. Before wiring,
1) Disconnect the power supply cord.
2) Open the door and block it open.
3) Discharge the high voltage capacitor and wait for 60
seconds.
2. Don't let the wire leads touch to the following parts;
1) High voltage parts:
Magnetron, Power transformer, High voltage capacitor and
High voltage rectifier assembly.
2) Hot parts:
Oven lamp, Magnetron, Power transformer, Oven cavity
and Heating element.
Please refer to 'OVEN PARTS, CABINET PARTS, CONTROL PANEL PARTS, DOOR PARTS', when carrying out any of the following
removal procedures:
1. Disconnect the power supply cord.
2. Open the oven door and block it open.
3. Remove the three (3) screws holding the exhaust cover to the
back plate.
4. Remove the four (4) screws holding the louver cover to the
back plate.
5. Remove the three (3) screws holding the rear side of the outer
case cabinet to the back plate.
6. Remove the four (4) screws holding the right and left sides of
1. Disconnect the power supply cord.
2. Remove the outer case cabinet, referring to "OUTER CASE
CABINET REMOVAL".
WARNING AGAINST HIGH VOLTAGE:
WARNING FOR WIRING
OUTER CASE REMOVAL
OVEN LAMP AND LAMP SOCKET REMOVAL
2. Door hinge, support or latch hook is damaged.
3. The door gasket or seal is damaged.
4. The door is bent or warped.
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.
3) Sharp edge:
Bottom plate, Oven cavity, Waveguide flange, Chassis
support and other metallic plate.
4) Moveable parts (to prevent a fault)
Fan blade, Fan motor, Switch, Door cam, Jet motor,
Convection fan, Turntable motor.
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 Pictorial Diagram.
the outer case cabinet to the bottom plate.
7. Slide the entire outer case cabinet back out about 1 inch (3cm)
to free it from retaining clips on the oven cavity front plate.
8. Lift entire outer case cabinet from the unit.
CAUTION
1. DISCONNECT THE OVEN FROM THE POWER SUPPLY
BEFORE REMOVING THE OUTER CASE CABINET.
2. DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE
TOUCHING ANY OVEN COMPONENTS OR WIRING.
3. Open the door and block it open.
4. Discharge high voltage capacitor.
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R-8000G