High Voltage Transformer Removal; Magnetron Removal; Control Panel Assembly Removal; Fan Motor Replacement - Sharp R-772WM Service Manual

Microwave oven with top and bottom grills
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COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
4. Remove one (1) screw holding earth side terminal of
the high voltage rectifier assembly.
5. Remove one (1) screw holding fan duct to the oven
cavity rear plate.
6. Remove one (1) screw holding capacitor holder to the
oven cavity rear plate.
7. Release the capacitor holder from the fan duct.
8. Remove the high voltage capacitor from the capacitor
holder.
9. Disconnect the high voltage wire B and the high voltage
rectifier assembly from the high voltage capacitor.
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. wire A from the high voltage
transformer.
4. Disconnect the main wire harness from the high volt-
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
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.
Key / Jog unit
4. Disconnect the connector CN-G from the CPU unit.
5. Remove the two (2) screws holding the LCD holder to
the control panel frame.
6. Remove the four (4) screws holding the power unit to
REMOVAL
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 one (1) screw holding the chassis support
to the oven cavity front flange.
5. Remove the chassis support from the oven cavity.
6. Disconnect the wire leads from the fan duct.
7. Remove the one (1) screw holding the capacitor holder
to the oven cavity back plate.
8. Release the tabs of the capacitor holder from the fan
duct.
9. Remove the one (1) screw holding the fan duct to the
oven cavity back plate.
10.Remove the fan duct from the oven.

HIGH VOLTAGE TRANSFORMER REMOVAL

MAGNETRON REMOVAL

CONTROL PANEL ASSEMBLY REMOVAL

FAN MOTOR REPLACEMENT

10.Disconnect the high voltage rectifier assembly from the
high voltage wire B.
11.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.
age transformer.
5. Remove the two (2) screws and one (1) washer holding
the transformer to the base plate.
7. Remove the transformer.
8. Now the high voltage transformer is free.
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.
the control panel frame.
7. Remove the control unit assembly (CPU unit and
Power unit) from the control panel frame.
8. Remove the six (6) screws holding the key / jog unit to
the control panel frame.
9. Remove the key / jog unit from the control panel frame.
10.Remove the vari knob and the rotary knob from the key
/ jog unit.
11.Now, the key / jog unit is free.
11.Remove the fan duct 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.
CAUTION:
• Make sure that no swarf from the rotor enters
the gap between the rotor & startor of the fan
motor.
• Avoid touch the coil of the fan motor with the
pliers as the coil may become cut or damaged.
• Avoid deforming the bracket whilst using the
pliers.
2) Remove the fan blade assembly from the shaft of
the fan motor by pulling and rotating the fan blade
with your hand.
3) Now, the fan blade is free.
23

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This manual is also suitable for:

R-772gmR-772mR772m-003

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