Outer Case Removal; Power Transformer Removal; High Voltage Rectifier And High Voltage Capacitor Removal; Magnetron Removal - Sharp R-426LS Service Manual

[2] OUTER CASE REMOVAL

To remove the outer case, procedure as follows.
1. Disconnect the power supply cord.
2. Open the oven door and block it open.
3. Remove the two (2) screws from the lower portion of the rear cabi-
net using a T20H Torx type or GTXH20-100 screw driver.
4. Remove the remaining two (2) screws from rear.
5. Slide the entire outer case back out about 1 inch (3 cm) to free it
from retaining clips on the cavity face plate.
6. Lift entire outer case from the unit.
CAUTION: DISCONNECT OVEN FROM POWER SUPPLY BEFORE
REMOVING OUTER CASE.
DISCHARGE THE
BEFORE TOUCHING ANY OVEN COMPONENTS OR
WIRING.

[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.

[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.

[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.
HIGH VOLTAGE CAPACITOR
NOTE: When replacing the outer case, the 2 special Torx screws
must be reinstalled in the same locations.
Special screw
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.
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.
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.
11 – 2
R426LS
Screw Driver
(Type: TORX T20 H or
GTXH20-100)