R-90GCK (serv.man10). Component replacement adjustment procedure, microwave measurement - Sharp Home Appliance Service Manual (repair manual). Page 5

28

angle A to the heater duct upper.

5. Remove the two (2) nuts holding the top heating

element to the heater duct upper.

6. Now, the top heating element is free.

1. Disconnect the oven from power supply.
2. Wait for 60 seconds to discharge the high voltage

capacitor.

3. Remove the turntable tray and the turntable support

from the oven cavity.

4. Lay the oven on its backside.
5. Remove the turntable motor cover by snipping off the

material in four corners.

6. Where the corners have been snipped off, bend corner

areas flat. No sharp edges must be evident after
removal of the turntable motor.

7. Disconnect the wire leads from the turntable motor.
8. Remove the one (1) screw holding the turntable motor

to the oven cavity bottom plate.

9. Now, the turntable motor is free.
10.After replacement, use the one (1) screw to fit the

turntable motor cover.

1. CARRY OUT 3D CHECKS.
2. Remove the back plate from the oven, referring to

"BACK PLATE REMOVAL".

3. Remove the high voltage capacitor, referring to "HIGH

VOLTAGE CAPACITOR, HIGH VOLTAGE RECTIFIER
ASSEMBLY AND HIGH VOLTAGE FUSE REMOVAL".

4. Now, the power supply cord should be disconnected

from the noise filter.

5. Disconnect the main wire harness form the noise filter.
6. Remove the one (1) screw holding the noise filter to the

bottom plate.

7. Remove the noise filter from the bottom plate.
8. Remove the fuse from the noise filter.
9. Now, the noise filter is free.

Removal
1. CARRY OUT 3D CHECKS.
2. Disconnect the wire leads from the switch.
3. Remove the one (1) screw holding the latch hook (right

or left) to the oven cavity front plate, and release the
latch hook (right or left).

4. Keep pushing the stopper tub holding the switch to the

latch hook (right or left) and revolve the switch on the
pole.

5. Remove the switch from the latch hook (right or left).
6. Now, the switch is free.
Reinstallation
1. Reinstall the switch in its place. The door sensing

switch is in the lower position of the latch hook right.
The 3rd. latch switch is in the upper position of the latch
hook right. The secondary interlock switch is in the
lower position of the latch hook left. And the monitor
switch is in the upper position of the latch hook left.

2. Hold the latch hook (right or left) to the oven cavity front

plate with the one (1) screw.

3. Reconnect the wire leads to the switch.
4. Make sure that the monitor switch is operating properly

and check continuity of the monitor circuit. Refer to
chapter “Test Procedure” and “Adjustment procedure.

If the door sensing switch, 3rd. latch switch, secondary
interlock switch and monitor switch do not operate prop-
erly due to a misadjustment, the following adjustment
should be made.
1. CARRY OUT 3D CHECKS.
2. Loosen each one (1) screw holding the latch hook right

and the latch hook left to the oven cavity front plate.

3. With door closed, adjust the latch hook right and the latch

hook left by moving them back and forth, and up and
down. In and out play of the door allowed by the latch
hook right and the latch hook left should be less than 0.5
mm. The vertical position of the latch hook right and the
latch hook left should be adjusted so that the door

sensing switch and the secondary interlock switch are
activated with the door closed. The horizontal position of
the latch hook right and the latch hook left should be
adjusted so that the plungers of the 3rd. latch switch and
monitor switch are pressed with the door closed.

4. Secure the screws firmly.
5. Check all of the switches operation. If any switch has

not activated with the door closed, loosen the screws
and adjust the position of the latch hook right and the
latch hook left.

After adjustment, check the following.
1. In and out play of the door remains less than 0.5 mm

when in the latched position. First check the position of

Monitor switch

Latch hook left

Secondary 
interlock switch
(Monitored latch switch)

Door sensing switch

Latch hook right

Pole

Pole

Pole

Stopper tab

Stopper 
tab

3rd. door
switch

(Primary interlock relay 
 control switch)