Sharp R-55TS Service Manual page 30

R-55TS
CAUTION: 1. DISCONNECT OVEN FROM POWER SUP
PLY BEFORE REMOVING OUTER CASE.
2. DISCHARGE THE HIGH VOLTAGE CA-
PACITOR BEFORE TOUCHING ANY OVEN
COMPONENTS OR WIRING.
NOTE: When replacing the outer case, the 2 special
Torx screws must be reinstalled in the same
locations.
1. Disconnect the power supply cord and then remove
outer case.
2. Open the oven door and block it open.
3. Discharge high voltage capacitor.
4. Remove two (2) screws holding the capacitor band with
the high voltage capacitor to the bottom plate assembly.
5. Disconnect wire leads (primary) from power transformer
and the filament leads and high voltage wire from the
magnetron and capacitor terminals.
6. Remove four (4) screws holding transformer to bottom
plate (from bottom side ).
7. Remove transformer from bottom plate.
HIGH VOLTAGE RECTIFIER AND HIGH VOLTAGE CAPACITOR REMOVAL
1. Disconnect the power supply cord and then remove
outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect the high voltage wire of the power transformer
from the high voltage capacitor.
5. Disconnect the high voltage wire of high voltage rectifier
assembly from the magnetron.
6. Disconnect the filament lead (short one) of the power
transformer from the high voltage capacitor.
7. Remove the two (2) screws holding capacitor holder to
Removal
1. Disconnect the power supply cord and then remove the
outer case.
2. Open the oven door and block it open.
3. Discharge the high voltage capacitor.
4. Disconnect all wire leads from the magnetron and the
oven lamp.
5. Remove the two (2) screws holding the chassis support
to the oven cavity front flange and the bottom plate
assembly. And remove the chassis support.
6. Release the snap band of the main wire harness from
the air duct.
7. Remove the two (2) screws holding the C/T fuse to the
air duct.
POWER TRANSFORMER REMOVAL
Reinstallation
1. Rest transformer on the bottom plate with its primary
2. Secure transformer with four (4) screws (from bottom side)
3. Reconnect wire leads (primary) to power transformer
4. Reinstall the capacitor band with the high voltage
5. Reinstall outer case and check that oven is operating
8. Remove one (1) screw holding high voltage rectifier
9. Disconnect rectifier terminal from capacitor.
10.Remove capacitor holder. Capacitor is now free.
CAUTION: WHEN REPLACING HIGH VOLTAGE RECTI-
MAGNETRON REMOVAL
8. Remove the one (1) screw holding the thermistor angle
9. Carefully remove the three (3) screws holding the
10.Remove the magnetron with care so that its antenna is
11.Remove the two (2) screws holding the air duct to the
12.Remove the two (2) screws holding the reflector to the
13.Now, the magnetron is free.
Reinstallation
1. Reinstall the reflector to the magnetron with the two (2)
28
Special screw
Screw Driver
(Type: TORX T20 H or
GTXH20-100)
terminals toward the oven face plate.
to bottom plate.
and filament leads and high voltage wire of transformer
to magnetron and high voltage capacitor. Refer to
"PICTORIAL DIAGRAM".
capacitor to the bottom plate assembly with two (2)
screws.
properly.
bottom plate.
assembly to capacitor holder.
High voltage rectifier assembly is now free.
FIER AND HIGH VOLTAGE CAPACITOR,
GROUND SIDE TERMINAL OF THE HIGH
VOLTAGE RECTIFIER MUST BE SECURED
FIRMLY WITH A GROUNDING SCREW.
to the magnetron.
magnetron to the waveguide flange.
not hit by any metal object.
magnetron and remove it.
magnetron and remove it.
screws.