R-21AT - Sharp Home Appliance Service Manual (repair manual). Page 22

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To remove the components, proceed as follows.
1. CARRY OUT 3D CHECKS.
2. Disconnect H.V. wire of the high voltage rectifier as-

sembly from the magnetron.

3. Disconnect the filament lead of the high voltage trans-

former from the high voltage capacitor.

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

the high voltage rectifier assembly.

5. Disconnect high voltage fuse and terminal of high

voltage rectifier assembly from the high voltage ca-
pacitor.

6. Now, the high voltage rectifier assembly should be free.
7. Disconnect the high voltage fuse from the high voltage

transformer.

8. Now, the high voltage fuse is free.
9. Remove one (1) screw holding the capacitor holder to

the oven cavity rear plate.

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

cavity rear plate.

11.Release the capacitor holder from the fan duct.
12.Remove the capacitor from the capacitor holder.
13.Now, the capacitor should be free.

CAUTION: WHEN REPLACING HIGH VOLTAGE

RECTIFIER ASSEMBLY, ENSURE THAT
THE CATHODE (EARTH) CONNECTION
IS SECURELY FIXED TO THE CAPACI-
TOR HOLDER AND OVEN CAVITY REAR
PLATE WITH AN EARTHING SCREW.

1. Disconnect the 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 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.

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

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 five (5) screws from rear and along the

side edge of case.

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

retaining clips on the cavity face plate.

5. Lift the entire case from the oven.
6. Discharge the H.V. capacitor before carrying out any

further work.

7. Do not operate the oven with the outer case removed.
N.B.; Step 1, 2 and 8 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.

1. CARRY OUT 3D CHECKS.
2. Disconnect the filament leads of high voltage trans-

former from high voltage capacitor and the magnetron.

3. Disconnect the H.V. fuse from the high voltage trans-

former.

4. Disconnect the main wire harness from the high volt-

age transformer.

5. Remove the four (4) screws  holding the transformer to

base plate.

6. Remove the transformer.
7. Now the high voltage transformer is free.

1. CARRY OUT 3D CHECKS.
2. Disconnect the high voltage wire of the high voltage

rectifier assembly and filament lead of the transformer
from the magnetron.