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Door Sensing Switch/Primary Switch/
Third Door Switch And Monitor
Switch Removal
1. Disconnect the power cord and remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
To discharge the high voltage capacitor, wait for 60
seconds and then short-circuit the connection of
the high-voltage capacitor (that is the connecting
lead of the high-voltage rectifier) against the
chassis with the use of an insulated screwdriver.
4. Disconnect wire leads from the switches.
5. Remove two (2) screws holding latch hook to oven
flange.
6. Remove latch hook assembly from oven flange.
7. Push outward on the two (2) retaining tabs holding
switch in place.
8. Switch is now free. At this time switch lever will be
free, do not lose it.
Re-install
1. Re-install each switch in its place. The third door in-
terlock/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. 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.
Door Sensing Switch/Primary Switch/
Third Door Switch And Monitor
Switch Adjustment
1. Disconnect power cord and remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
To discharge the high voltage capacitor, wait for 60
seconds and then short-circuit the connection of
the high-voltage capacitor (that is the connecting
lead of the high-voltage rectifier) against the
chassis with the use of an insulated screwdriver.
Component Teardown and Testing
If door sensing switch, primary switch, secondary switch
and monitor switch do not operate properly due to a mis-
adjustment, 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, primary switch and third
door 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 posi-
tion of latch hook, pushing and pulling upper portion
of door toward the oven face. Then check lower por-
tion of the latch hook, pushing and pulling upper por-
tion of door toward the oven face. Both results (play in
the door) should be less than 0.5mm.
2. The door sensing switch, primary switch and third
door 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.
Figure 4-6. Latch Switch Adjustments
4-7
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