R-734 (serv.man4). Complete - Sharp Home Appliance Service Manual (repair manual). Page 25

R-734 - 25

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

high voltage transformer from high voltage capacitor
and the magnetron.

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

age transformer.

4. Remove the two (2) screws and one (1) washer holding

the transformer to the base plate.

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

1. CARRY OUT 3D CHECKS.
2. Disconnect the H.V. wire B and filament lead of the

transformer from the magnetron.

3. Remove the one (1) screw holding the chassis support

to the magnetron.

4. Move the air intake duct to left.
5. Carefully remove four (4) screws holding the magnetron

to the waveguide, when removing the screws hold the

magnetron to prevent it from falling.

6. Remove the magnetron from the waveguide with care

so the magnetron antenna is not hit by any metal object
around the antenna.

CAUTION: WHEN REPLACING THE MAGNETRON,

BE SURE THE R.F. GASKET IS IN PLACE
AND THE MAGNETRON MOUNTING
SCREWS ARE TIGHTENED SECURELY.

5. Remove the four (4) screws holding the control unit to

the control panel frame.

6. Remove the rotary knob from the control unit.
7. Now, the control unit is free.
8. Remove the four (4) screws holding the switch unit to

the control panel frame.

9. Now, switch unit is free.

1. CARRY OUT 3D CHECKS.
2. Disconnect the wire leads and the connectors from the

control unit.

3. Lift up the control panel assembly and pull it forward.

Now the control panel assembly is free.

Switch unit
4. Disconnect the connector CN-G from the control unit.

1. CARRY OUT 3D CHECKS.
2. Push the lever of positive lock

®

 connector.

3. Pull down on the positive lock

®

 connector.

CAUTION: WHEN YOU (SERVICE ENGNEERS) CON-

NECT THE POSITIVE LOCK

®

 CONNEC-

TORS TO THE TERMINALS, CONNECT
THE POSITIVE LOCK

®

 SO THAT THE LE-

VER FACES YOU.

7. Remove the high voltage capacitor from the capacitor

holder.

8. Disconnect the high voltage rectifier assembly from

the high voltage capacitor.

9. Now, the high voltage rectifier assembly and the high

voltage 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 WITH AN EARTHING
SCREW.

1. CARRY OUT 3D CHECKS.
2. Remove the one (1) screw holding the noise filter to the

chassis support.

3. Release the noise filter from the tabs of the fan duct.
4. Remove the two (2) screws holding the chassis sup-

port to the oven cavity front flange and the magnetron.

5. Remove the chassis support from the oven cavity.
6. Disconnect the wire leads from the fan motor.
7. Remove the one (1) screw holding the capacitor holder

to the oven cavity back plate.

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

oven cavity back plate.

9. Release the tabs of the capacitor holder from the fan

duct.

10.Remove the fan duct from the oven.
11.Remove the fan blade from the fan motor shaft accord-

ing to the following procedure.
1) Hold the edge of the rotor of the fan motor by using

a pair of groove joint pliers.

Terminal

Push

Pull down

1

2

Lever

Positive lock®

connector