R-247. Complete - Sharp Home Appliance Service Manual (repair manual). Page 18

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To To remove the outer case, procedure as follows.
1. Disconnect the power supply cord.
2. Open the oven door and block it open.
3. Remove the two (2) screws along the right side of the

outer case.

4. Remove the remaining five (5) screws from the rear of

the outer case.

5. Slide the entire outer case back out about 1 inch (3 cm)

to free it from retaining clips on the cavity face plate.

6. Lift entire outer case from the unit.

7. Discharge the H. V. capacitor before curring out any

further work.

8. Do not operate the oven with the  outer case removed.
NOTE: Step 1, 2 and 7 form the basis of the 3D checks.

CAUTION:1. DISCONNECT OVEN FROM POWER SUP-

PLY BEFORE REMOVING OUTER CASE.

2. DISCHARGE THE HIGH VOLTAGE CA-

PACITOR BEFORE TOUCHING ANY
OVEN COMPONENTS OR WIRING.

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
Harness, High Voltage fuse etc..

To prevent an electric shock, take the following pre-
cautions.
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 volt-
age capacitor, High voltage rectifier assembly and
High voltage fuse.

2) Hot parts:

1. Disconnect the oven from power supply.
2. Make sure that a definite” click” can be heard when

the microwave oven door is unlatched. (Hold the door
in a closed position with one hand, then push the door
open button 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 generat-

ing 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.

Oven lamp, Magnetron, High voltage transformer,
Oven cavity.

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, 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: