R-291KM - Sharp Home Appliance Service Manual (repair manual). Page 22

CARRY OUT  3D  CHECKS.

Remove the control panel assembly, referring to section of 
CONTROL PANEL ASSEMBLY REMOVAL.

Disconnect wire leads from the switches.

Remove two (2) screws holding latch hook to oven flange.

Remove latch hook assembly from oven flange.

Push outward on the two (2) retaining tabs holding switch in 
place.

Switch is now free.

1.

2.

3.

4.

5.

6.

7.

Re-install each switch in its place. The 1st. latch switch and 
the monitor switch are in the lower position and the 2nd. in -
terlock relay control switch is in the upper position

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

Re-connect wire leads to each switch. Refer to pictorial diagram.

Reinstall the control panel assembly to the oven cavity.

Reconnect wire leads to the control unit, referring to the pic-
torial diagram. 

Make sure that the monitor switch is operating properly and 
check continuity of the monitor circuit. Refer to chapter "Test 
Procedure" and Adjustment procedure.

1.

2.

3.

4.

5.

6.

CARRY OUT  3D  CHECKS.

If  the 1st. latch switch, 2nd. interlock relay control switch and 
monitor switch do not operate properly due to a misadjust -
ment, the following adjustment should be made.

2. Loosen the two (2) screws holding latch hook to the oven 

cavity front flange.

3. With 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 vertical position of the latch hook 
should be adjusted so that the 1st. latch switch and 2nd. 
interlock relay control switch are activated with the door 
closed. The horizontal position of the latch hook should be 
adjusted so that the plunger of the monitor switch is pressed 
with the door closed.

4. Secure the screws with washers 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.

In and out play of 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.       

1.

1.

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

When the door is open, the contacts of the 1st. latch switch 
and 2nd. interlock relay control switch open within 1.6mm 
gap between right side of cavity face and the door.

Monitor switch contacts close when door is opened.

Re-install outer case and check for microwave leakage 
around door with an approved microwave survey meter. 
(Refer to Microwave Measurement Procedure.)

Latch Heads

Latch Hook

Door

Door Sensing Switch

Secondary Interlock Switch

Monitor Switch

2.

3.

4.

Disconnect the power supply cord.

Open the door slightly.

Insert a putty knife (thickness of about 0.5mm) into the gap 
between the choke cover and corner portion of door panel 
as shown in Figure C-6 to free engaging parts.

Pry the choke cover by inserting a putty knife as shown Figure C-6.

Release choke cover from door panel.

Now choke cover is free.

NOTE: When carrying out any repair to the door, do not 

bend or warp the slit choke (tabs on the door panel 
assembly) to prevent microwave leakage.

1.

2.

3.

4.

5.

6.

Choke Cover

Door Frame

Putty Knife

R-291(K)M

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