R420LW
11 – 2
CAUTION: DISCONNECT OVEN FROM POWER SUPPLY BEFORE
REMOVING OUTER CASE.
DISCHARGE THE HIGH VOLTAGE CAPACITOR
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.
[3] POWER TRANSFORMER REMOVAL
1. REMOVAL
1. Disconnect the power supply cord and remove outer case.
2. Open the oven door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect wire leads (primary) from power transformer and the fil-
ament leads from the magnetron and capacitor terminals.
5. Disconnect high voltage lead of the power transformer from the
high voltage capacitor.
6. Remove two (2) screws holding transformer to bottom plate.
7. Remove transformer from bottom plate.
2. REINSTALLATION
1. Rest transformer on the bottom plate with its primary terminals
toward the oven face plate.
2. Secure transformer with two (2) screws to bottom plate.
3. Reconnect the wire leads (primary) to power transformer and fila-
ment leads of transformer to magnetron and high voltage capacitor.
Reconnect the high voltage lead of the power transformer to the
high voltage capacitor. Refer to “PICTORIAL DIAGRAM”.
4. Reinstall outer case and check that oven is operating properly.
[4] HIGH VOLTAGE RECTIFIER AND HIGH VOLTAGE CAPACITOR REMOVAL
To remove the components, proceed as follows.
1. Disconnect the power supply cord and remove outer case.
2. Open the oven 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 one (1) screw holding capacitor holder with the high
voltage rectifier to the base plate.
8. Disconnect rectifier terminal from capacitor. High voltage rectifier
assembly is now free.
9. Remove capacitor holder. Capacitor is now free.
CAUTION: WHEN REPLACING HIGH VOLTAGE RECTIFIER AND
HIGH VOLTAGE CAPACITOR, GROUND SIDE TERMI-
NAL OF THE HIGH VOLTAGE RECTIFIER MUST BE
SECURED FIRMLY WITH A GROUNDING SCREW.
[5] MAGNETRON REMOVAL
1. REMOVAL
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. Disconnect all wire leads from magnetron.
5. Remove the two (2) screws holding the chassis support to the mag-
netron and the oven cavity front flange.
6. Slide the magnetron duct slightly so that the two (2)screws at left
hand side of the magnetron appear.
7. Carefully remove the four (4) screws holding magnetron to
waveguide flange.
8. Remove magnetron with care so that magnetron antenna is not hit
by any metal object around the antenna.
9. Now, the magnetron is free.
2. REINSTALLATION
1. Re-install the magnetron to waveguide flange with car to prevent
damage to the magnetron antenna.
2. Secure the magnetron with the four (4) screws.
3. Hold the chassis support to the oven cavity front plate and the mag-
netron with the two (2) screws.
4. Reconnect the wire leads to the magnetron. Refer to “PICTORIAL
DIAGRAM”.
5. Reinstall 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.
Special screw
Screw Driver
(Type: TORX T20 H or
GTXH20-100)
