R-8000GK - Sharp Home Appliance Service Manual (repair manual). Page 23

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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, High Voltage Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Fuse,  High
Voltage Harness etc..

To prevent an electric shock, take the following precau-
tions.
1. Before wiring,

1) Disconnect the oven from power supply.
2) Open the door and wedge the door 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, High voltage transformer, High voltage
capacitor, High voltage fuse and High voltage rectifier
assembly.

2) Hot parts:

Oven lamp, Magnetron, High voltage transformer, Oven

1. Disconnect the oven from power supply.
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.

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.

cavity and Heating element.

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.

Please refer to ‘OVEN PARTS, CABINET PARTS, CONTROL PANEL PARTS, DOOR PARTS’, when carrying out any of the following
removal procedures:

1. Disconnect the oven from power supply.
2. Open the oven door and wedge the door 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

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.
9. Discharge the high voltage capacitor before carrying out any

further work.

10. Do not operate the oven with the outer case removed.
N.B.; Step1, 2 and 9 from the basis of the 3D checks.
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.

1. CARRY OUT 3D CHECKS.

2. Pull the wire leads from the oven lamp socket by pushing the

terminal hole of the oven lamp socket with the flat type small

screw driver.

3. Tear the cushion from the light mounting plate.
4. Bend the tab of the light mounting plate holding the oven.