Sharp R-340A, Service Manual

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R-340A
19
HIGH VOLTAGE RECTIFIER, HIGH VOLTAGE FUSE AND HIGH VOLTAGE CAPACITOR
REMOVAL
1. CARRY OUT 3D CHECKS.
2. Disconnect the brown and blue wires of power supply
cord from the noise filter.
3. Disconnect the connector of the main wire harness
from the noise filter.
4. Remove one (1) screw holding the noise filter angle to
the oven cavity rear plate.
5. Remove one the noise filter angle with noise filter from
the oven cavity rear plate.
6. Disconnect the high voltage fuse from the power
transformer.
7. Remove one (1) screw holding capacitor holder to the
oven cavity rear plate.
8. Remove one (1) screw holding high voltage rectifier
assembly to capacitor holder.
9. Disconnect rectifier terminal from capacitor.
10.Disconnect wire leads and high voltage fuse from
capacitor and remove capacitor holder.
11.High voltage rectifier assembly, high voltage fuse and
high voltage capacitor are free now.
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.
MAGNETRON REMOVAL
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. Insert the two (2) tabs of the chassis support to the oven
cavity front plate and back plate.
3. Re-install the chassis support to oven cavity front plate
and magnetron with the two (2) screws.
4. Reconnect the wire leads to the magnetron. Refer to
"PICTORIAL DIAGRAM".
5. 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
MOUNTING SCREWS ARE TIGHTENED
SECURELY.
SCREWS
WAVEGUIDE
FLANGE
MAGNETRON
Figure C-1. Magnetron replacement
1. CARRY OUT 3D CHECKS.
2. Pushing the lever of positive lock
® connector.
3. Pull out the positive lock
®
connector.
CAUTION: WHEN YOU (SERVICE ENGINEERS) CON-
NECT THE POSITIVE LOCK
®
CONNECTORS
TO THE TERMINALS, CONNECT THE POSI-
TIVE LOCK
®
SO THAT THE LEVER FACE
YOU (SERVICE ENGINEERS).
POSITIVE LOCK ® CONNECTOR REMOVAL
Terminal
Push
Pull down
1
2
Lever
Positive lock ®
connector
Figure C-2. Positive lock
®
connector
1. Open covers of the terminal insulator by using small flat
type screw driver.
2. Remove the receptacle from the terminal insulator.
3. Now, the terminal insulator is free.
Installation
1. Insert the receptacle into terminal insulator.
2. Close covers of the terminal insulator, as shown
illustlated below.
TERMINAL INSULATOR REPLACEMENT
RECEPTACLE
COVERS
Terminal
insulator
Flat type
screw driver