Capacitor Removal; Magnetron Removal; Positive Lock Connector (No-Case Type) Removal; Turntable Motor Removal - Sharp R-239 Service Manual

2. Disconnect the wire leads (main wire harness and H.V. fuse) from
high voltage transformer.
3. Disconnect the filament lead of high voltage transformer from the
magnetron.
4. Disconnect the filament lead of the high voltage transformer from
high voltage capacitor.
[4] HIGH VOLTAGE RECTIFIER ASSEMBLY, HIGH VOLTAGE FUSE AND HIGH VOLTAGE

CAPACITOR REMOVAL

To remove the components, proceed as follows.
1. CARRY OUT 3D CHECKS.
2. Disconnect the H.V. fuse from the high voltage transformer.
3. Disconnect the H.V. wire of the H.V. rectifier assembly from the
magnetron.
4. Disconnect the filament lead of the high voltage transformer from
the H.V. capacitor.
5. Remove one (1) screw holding capacitor holder to the oven cavity
back plate.
6. Remove one (1) screw holding earth side terminal of high voltage
rectifier assembly, and remove capacitor holder.

[5] MAGNETRON REMOVAL

1. REMOVAL
1. CARRY OUT 3D CHECKS.
2. Disconnect the wire leads from the magnetron.
3. Remove the two (2) screws holding the air duct to the oven cavity.
4. Release the air duct from the oven cavity.
5. Carefully remove the four (4) screws holding the magnetron to the
waveguide flange.
6. Lift up magnetron with care so that the magnetron antenna is not
hit by any metal object around antenna.
7. Now, the magnetron is free.

[6] POSITIVE LOCK CONNECTOR (NO-CASE TYPE) REMOVAL

1. CARRY OUT 3D CHECKS.
2. Push the lever of positive lock® connector.
3. Pull down on the positive lock® connector.
CAUTION: WHEN CONNECTING THE POSITIVE LOCK®
CONNECTORS TO THE TERMINALS, CON-
NECT THE POSITIVE LOCK® SO THAT THE
LEVER FACES YOU.

[7] TURNTABLE MOTOR REMOVAL

1. REMOVAL
1. Disconnect the power supply cord.
2. Remove turntable and turntable support from oven cavity.
3. Lay the oven on it's backside. Remove the turntable motor cover by
snipping off the material in four corners.
4. Where the corners have been snipped off bend corner areas flat.
No sharp edges must be evident after removal of the turntable
motor cover.
5. Remove the two (2) screws holding the transformer to bottom plate
from below.
6. Remove the two (2) screws holding the transformer to bottom plate
from above.
7. Remove the transformer.
7. Disconnect all the leads and terminals of high voltage rectifier
assembly from high voltage capacitor.
8. Disconnect the H.V. fuse from the high voltage capacitor.
9. Now H.V. rectifier assembly, H.V. fuse and H.V. capacitor should be
free.
CAUTION: WHEN REPLACING
ASSEMBLY, ENSURE THAT THE CATHODE (EARTH)
CONNECTION IS SECURELY FIXED TO THE CAPACI-
TOR HOLDER WITH AN EARTHING SCREW.
CAUTION: DO NOT REPLACE ONLY HIGH VOLTAGE RECTIFIER.
WHEN REPLACING IT, REPLACE HIGH VOLTAGE REC-
TIFIER ASSEMBLY.
2. REINSTALLATION
1. Reinstall the magnetron to the waveguide flange with the four (4)
screws.
2. Reinstall the air duct to the oven cavity with the two (2) screws.
3. Reconnect the wire leads to the magnetron. Refer to "PICTORIAL
DIAGRAM".
4. Reinstall the outer case and check that the oven is operating prop-
erly.
CAUTION: WHEN REPLACING THE MAGNETRON, BE SURE THE
R.F. GASKET IS IN PLACE AND THE MAGNETRON
MOUNTING SCREWS ARE TIGHTENED SECURELY.
Positive lock¨
connector
Lever
Figure C-1. Positive lock, connector
5. Disconnect wire leads from turntable motor.
(See "Positive lock connector removal")
6. Remove one (1) screw holding turntable motor to oven cavity.
7. Remove the TTM packing from the turntable motor.
8. Now, the turntable motor is free.
11 – 2
R239(W)
HIGH VOLTAGE RECTIFIER
Terminal
1
Push
2
Pull down