Service manual

26
1. Disconnect the power supply cord, and then remove
outer case.
2. Open the door and block it open.
3. To discharge the high voltage capacitor, wait for 60
seconds.
If the door sensing switch, primary interlock switch and
monitor switch do not operate properly due to a
misadjustment, the following adjustment should be made.
4. Loosen the two (2) screws holding latch hook to the oven
cavity front flange.
5. 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 door sensing
switch and primary interlock 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.
6. Secure the screws with washers firmly.
7. Check the operation of all switches. If each 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
DOOR SENSING SWITCH/PRIMARY INTERLOCK SWITCH AND MONITOR SWITCH ADJUSTMENT
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 contacts of door sensing switch and primary interlock
switch open within 1.6mm gap between right side of
cavity face plate and door when door is open.
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.)
Figure C-4. Latch Switch Adjustments
DOOR REPLACEMENT
1. Disconnect the power supply cord and remove outer case.
2. Open the door and block it open.
3. To discharge the high voltage capacitor, wait for 60
seconds.
4. Disconnect the wire leads from the switches.
5. Push outward on the one (1) retaining tabs holding
switch in place.
6. The switch is now free.
DOOR SENSING SWITCH/PRIMARY INTERLOCK SWITCH AND MONITOR SWITCH REMOVAL
Reinstallation
1. Re-install each switch in its place. The primary interlock/
monitor switches are in the lower position and the door
sensing switch is in the upper position.
2. Re-connect wire leads to each switch.
Refer to pictorial diagram.
3. Make sure that the monitor switch is operating properly
and check continuity of the monitor circuit. Refer to
chapter "Test Procedure" and Adjustment procedure.
Choke Cover
Door Frame
Putty Knife
Latch Hook
Door Sensing
Switch
Latch
Heads
Door
Monitor Switch
Primary
Interlock Switch
REMOVAL
1. Disconnect the power supply cord and then remove the
outer case.
2. Open the door slightly.
3. To discharge high voltage capacitor, wait for 60 seconds.
4. Remove the two (2) screws holding the front cover to the
base plate.
5. Remove the front cover from the oven cavity by releasing
the three (3) tabs.
6. Disconnect the 7-pin wire harness from the power unit
on the base plate.
7. Insert a putty knife (thickness of about 0.5mm) into the
gap between the choke cover and door frame as shown
in Figure C-5 to free engaging parts.
8. Pry the choke cover by inserting a putty knife as shown
Figure C-5.
9. Release choke cover from door panel.
10.Now choke cover is free.
Figure C-5. Door Disassembly