R-242M - Sharp Home Appliance Service Manual (repair manual). Page 13

R-242M - 13

1. CARRY OUT 3D CHECKS.
2. Disconnect the wire leads from the switches and control

panel.

3. Remove the control panel assembly from the oven cavity

front flange. Referring to chapter "CONTROL PANEL
ASSEMBLY REMOVAL".

4. Remove the two (2) screw holding the latch hook to the

oven flange.

5. Remove the latch hook assembly from the oven flange.
6. To remove the switch.
6-1. With pushing outward on the tab that is holding the

switch, turn the switch so that the post is an axis.

6-2. Pull out the switch from the latch hook. Do not break the

post or tab of the latch hook.

6-3. Now the switch is free.

1. Re-install each switch in its place. The monitored latch

switch is in the lower position and the monitor switch is
in the middle position. The stop switch is in the upper
position.

2. Re-connect wire leads to each switch. Refer to  “Pictorial

Diagram”page 17.

3. Secure latch hook (with two (2) mounting screws) to

oven flange.
4. Re-install the control panel assembly to the oven cavity

front flange.

5. Re-connect wire leads to the control unit. Refer to

“Pictorial Diagram”page 17.

6. Make sure that monitor switch is operating properly and

check continuity of the monitor circuit. Refer to chapter

1. CARRY OUT 3D CHECKS.
If the monitored latch switch, stop switch and monitor switch
do not operate properly due to a misadjustment, the follow-
ing adjustment should be made.
2. Loosen the two (2) screws holding the latch hook to the

flange of the oven front face.

3. With the door closed, adjust latch hook by moving it back

and forth and up and down. In and out play of the door
allowed by the upper and lower position of the latch hook
should be less than 0.5mm. The horizontal position of
the latch hook should be adjusted so that the monitor
switch is activated with the door closed. The vertical
position of the latch hook should be adjusted so that the
stop switch and the monitored latch switch are activated
with the door closed.

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

not activated with the door closed, loosen screw and
adjust the latch hook position.

1. In and out play of the door remains less than 0.5mm

when in the latched position. First check upper position
of latch hook, pushing and pulling upper portion of door
toward the oven face. Then check lower portion of the
latch hook,  pushing and pulling lower portion of door
toward the oven face. Both results (play in the door)
should be less than 0.5mm.

2. The monitored latch switch and stop switch interrupt the

circuit before the door can be opened.

3. The monitor switch contacts (COM-NC) close when the

door is opened.

4. Re-install outer case and check for microwave leakage

around the door with an approved microwave survey
meter. (Refer to Microwave Measurement Procedure.)

Latch hook

Tab

SW3: Stop switch 

SW2: Monitor switch 

SW1:  Monitored latch switch 

Tab

Tab

Latch hook

SW3: Stop switch

Door

SW2: Monitor switch

SW1: Monitored latch switch

Latch heads

“Test Procedure”, and Adjustment Procedure below.