Sharp R-3H57 Service Manual page 30

R-3H57
1ST. LATCH SWITCH, 2ND. LATCH SWITCH AND MONITOR SWITCH REMOVAL
1. CARRY OUT 3D CHECKS.
2. Disconnect wire leads from the switches.
3. Remove two (2) screws holding latch hook to oven
flange.
4. Remove latch hook assembly from oven flange.
5. Push outward on the two (2) retaining tabs holding switch
in place.
6. Switch is now free. At this time switch lever will be free,
do not lose it.
1ST. LATCH SWITCH, 2ND. LATCH SWITCH AND MONITOR SWITCH ADJUSTMENT
If the 1st. latch switch, 2nd. latch switch and monitor switch
do not operate properly due to a misadjustment, the follow-
ing adjustment should be made.
1. Loosen the two (2) screws holding latch hook to the oven
cavity front flange.
2. 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. latch switch are activated with the door
closed.
3. Secure the screws with washers firmly.
4. Check the 2nd. latch switch operation. If the 2nd. latch
switch has not activated with the door closed, loosen
screw and adjust the latch hook position.
After adjustment, check the following.
1. 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. 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.
REMOVAL
1. Disconnect oven from power supply.
2. Push the open button and open the door slightly.
3. Insert an putty knife (thickness of about 0.5mm) into the
gap between the choke cover and corner portion of door
frame as shown Figure C-6 to free engaging parts.
4. Try the principles of the lever and lift up the choke cover
by inserting a putty knife as shown Figure C-6.
5. Release choke cover from door panel.
6. Now choke cover is free.
7. Release two (2) pins of door panel from two (2) hole of
upper and lower oven hinges by lifting up.
8. Now, door panel is free from oven cavity.
9. Remove the two (2) screws holding the door panel to the
Re-install
1. Re-install each switch lever and latch switch in its place.
The 1st. latch /monitor switches are in the lower position
and the 2nd. latch switch is in the upper position.
2. Re-connect wire leads to each switch.
Refer to pictorial diagram.
3. Secure latch hook (with two (2) mounting screws) to
oven flange.
4. Make sure that the monitor switch is operating properly
and check continuity of the monitor circuit.
chapter "Test Procedure" and Adjustment procedure.
2. The 2nd. latch switch and stop switch interrupt the circuit
before the door can be opened.
3. Monitor switch contacts close when door is opened.
4. Re-install outer case and check for microwave leakage
around door with an approved microwave survey meter.
(Refer to Microwave Measurement Procedure.)
DOOR REPLACEMENT
door frame.
10.Release door panel from nine (9) tabs of door frame by
sliding door panel downward.
11.Now, door panel with sealer film is free.
12.Tear sealer film from door panel.
13.Now, door panel is free.
14.Slide latch head upward and remove it from door frame
with releasing latch spring from door frame and latch
head.
15.Now, latch head and latch spring are free.
16.Remove door screen from door frame by releasing two
(2) tabs.
17.Now, door screen is free.
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LATCH HOOK
LATCH
HEADS
SWITCH
LEVER
STOP SWITCH
Figure C-5. Latch Switch Adjustments
Refer to
2ND. LATCH
SWITCH
MONITOR
SWITCH
1ST. LATCH
SWITCH