Sharp R-3H57 Service Manual page 27

Removal
1. CARRY OUT 3D CHECKS.
2. Disconnect wire leads from magnetron.
3. Remove the two (2) screws holding chassis support to
oven cavity front plate and magnetron.
4. Remove the chassis support from oven.
5. Carefully remove the two (2) screws holding magnetron
to waveguide flange.
6. Lift up magnetron with care so that magnetron antenna
is not hit by any metal object around antenna.
7. Now, the magnetron is free.
Re-install
1. Re-install the magnetron to waveguide flange with the
two (2) screws diagonally as shown in Figure C-1.
2. Re-install the chassis support to oven cavity front plate
and magnetron with the two (2) screws.
3. Reconnect the wire leads to the magnetron. Refer to
"PICTORIAL DIAGRAM".
HIGH VOLTAGE RECTIFIER AND HIGH VOLTAGE CAPACITOR REMOVAL
1. CARRY OUT 3D CHECKS.
2. Disconnect the high voltage of the high voltage rectifier
assembly from the power transformer.
3. Remove one (1) screw holding capacitor holder to oven
cavity rear plate.
4. Disconnect rectifier terminal from capacitor.
Rectifier and high voltage assembly is now free.
5. Remove one (1) screw holding high voltage rectifier
assembly to capacitor holder.
1. CARRY OUT 3D CHECKS.
2. Pushing the lever of positive lock
3. Pull out the positive lock
CAUTION: WHEN YOU (SERVICE ENGINEERS) CON-
NECT THE POSITIVE LOCK
TO THE TERMINALS, CONNECT THE POSI-
TIVE LOCK ®
YOU (SERVICE ENGINEERS).
1. CARRY OUT 3D CHECKS.
2. Disconnect wire leads from panel components.
3. Release one (1) nail holding the control panel assembly
to the oven flange.
4. Remove control panel assembly and slide upward.
5 . Now, individual components can be removed.
NOTE: 1. Before attaching a new key unit, remove remaining
MAGNETRON REMOVAL
POSITIVE LOCK
® connector.
® connector.
®
CONNECTORS
SO THAT THE LEVER FACE
CONTROL PANEL ASSEMBLY REMOVAL
4. Re-install outer case and check that the oven is operating
properly.
CAUTION: WHEN REPLACING MAGNETRON, BE SURE
THE R.F. GASKET IS IN PLACE AND MOUNT-
ING SCREWS ARE TIGHTENED SECURELY
Figure C-1. Magnetron replacement
6. Disconnect wire leads from capacitor and remove
capacitor holder.
7. High voltage rectifier assembly and high voltage capacitor
are free..
CAUTION: WHEN REPLACING HIGH VOLTAGE
RECTIFIER AND HIGH VOLTAGE CAPACITOR,
GROUND SIDE TERMINAL OF THE HIGH VOLTAGE
RECTIFIER MUST BE SECURED FIRMLY WITH A
GROUNDING SCREW.
®
CONNECTOR REMOVAL
Figure C-2. Positive lock
adhesive on the control panel frame surfaces
completely with alcohol.
2. When attaching the key unit to the control panel
frame, adjust the upper edge and right edge of
the key unit to the correct position of control panel
frame.
3. Stick the key unit firmly to the control panel frame
by rubbing with soft cloth not to scratch.
25
SCREWS
MAGNETRON
WAVEGUIDE
FLANGE
Terminal
®
Positive lock
connector
1
Push
Lever
2
Pull down
® connector
R-3H57