R-734 (serv.man2). Part 1 Text (1-30) - Sharp Home Appliance Service Manual (repair manual). Page 24

R-734 - 24

9. Lift the entire case from the oven.
10.Discharge the H.V. capacitor before carrying out any

further work.

11.Do not operate the oven with the outer case removed.

N.B.; Step 1, 2 and 10 form the basis of the 3D checks.

CAUTION: DISCHARGE HIGH VOLTAGE CAPACI-

TOR BEFORE TOUCHING ANY OVEN
COMPONENT OR WIRING.

CAUTION: WHEN THE OUTER CASE CABINET IS

RE-INSTALLED, INSTALL IT BEFORE THE
REAR AIR ANGLE, AIR DUCT AND BACK
PLATE ARE INSTALLED, OR THE OUTER
CASE CABINET WILL BE DEFORMED.

1. Disconnect oven from power supply.
2. Visually check the door and cavity face plate for dam-

age (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 are 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.

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

To prevent an electric shock, take the following
precautions
1. Before wiring,

1) Disconnect the 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 and High voltage rectifier assembly.

2) Hot parts:

Grill heating element, Oven lamp, Magnetron,

High voltage transformer and Oven cavity.

3) Sharp edge:

Bottom plate, Oven cavity, Waveguide flange,
Chassis support and other metallic plate.

4) Movable parts (to prevent a fault)

Fan blade, Fan motor, Switch and Turntable
motor.

3. Do not catch the wire leads in the outer case cabinet.
4. Insert the positive lock connector correctly until its pin

is locked. And make sure that the wire leads should
not  come off even if the wire leads is pulled.

5. To prevent an error function, connect the wire leads

correctly, referring to the Pictorial Diagram Page 33.

the high voltage rectifier assembly.

4. Remove one (1) screw holding fan duct to the oven

cavity rear plate.

5. Remove one (1) screw holding capacitor holder to the

oven cavity rear plate.

6. Release the capacitor holder from the fan duct.

To remove the outer case proceed as follows.
1. Disconnect oven from power supply.
2. Open the oven door and wedge it open.
3. Remove the one (1) screw holding the back plate to the

oven cavity rear plate. Remove the back plate.

4. Remove the one (1) screw holding the air duct assem-

bly to the oven cavity rear plate.

5. Remove the air duct assembly
6. Remove the two (2) screws holding the rear air angle

to the outer case cabinet.

7. Remove the six (6) screws from rear and along the side

edge of case.

8. Slide the entire case back about 3 cm to free it from

retaining clips on the cavity face plate.

To remove the components, proceed as follows.
1. CARRY OUT 3D CHECKS.
2. Disconnect the filament lead and high voltage wire of

the high voltage transformer and the high voltage wire
B from the high voltage capacitor.

3. Remove one (1) screw holding earth side terminal of