Sharp R-3A56, Service Manual

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24
R-3A56
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.
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. Refer to
chapter "Test Procedure" and Adjustment procedure.
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.
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.)
LATCH
HEADS
LATCH HOOK
2ND. LATCH
SWITCH
MONITOR
SWITCH
SWITCH
LEVER
STOP SWITCH
1ST. LATCH
SWITCH
Figure C-3. Latch Switch Adjustments
DOOR REPLACEMENT AND ADJUSTMENT
RE-INSTALL
1. On re-installing door, insert the lower oven hinge to lower
door hinge pin.
2. Insert the lower oven hinge to square opening in the
lower right side of the oven cavity face plate. (from front)
3. Insert the upper oven hinge to square opening in the
upper right side of the oven cavity face plate. (from rear)
4. Shut the door (close the contacts of interlock switches).
5. Make sure upper and lower oven hinges are inserted into
the upper an lower door hinge pins.
6. Make sure the door is parallel with oven face lines (left
and upper side lines) and door latch heads pass through
latch holes correctly.
7. Secure three (3) screws (LH SCREWS) holding the
lower oven hinge and the base plate (Left) to the bottom
REMOVAL
1. Disconnect oven from power supply and remove turntable
tray and turntable ring from oven cavity.
2. Remove the outer case cabinet, refer to "OUTER CASE
CABINET REMOVAL".
3. Remove two (2) screws from upper oven hinge.
4. Remove three (3) screws (LH SCREWS) holding lower
oven hinge and base plate (Left) to the bottom side of the
oven using a Special screw-driver (LHSTIX "LR-4").
5. Push the open button and open the door slightly.
6. Release the upper oven hinge from upper door hinge pin
by pulling down the door.
Note: When the individual parts are replaced, refer to
"Door Disassembly".;