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Interlocks (Door Latch Switches)
The interlocks are designed as follows:
Secondary - The top switch is operated by the top
latch pawl connected to the line (L) leg.
Latch Board
Latch Pawl
Prim
ary Interlock
Switch(Top)
Monitor Interlock
Switch(Middle)
Door Sensing
Switch(Botton)
Latch Pawl
To test the interlocks:
Disconnect power to the oven.
1.
Open the control panel.
2.
Discharge the capacitor.
3.
Primary - check continuity of COM and N.O.:
4.
Door Closed - 0
•
Ω
Door Open -
∞
•
Ω
Monitor Switch
The monitor switch is located between the top and
bottom interlocks. The monitor switch is operated
indirectly by the bottom latch pawl.
To test the interlock system:
Disconnect power to the oven.
1.
Open the control panel.
2.
Discharge the capacitor.
3.
Disconnect the monitor switch leads and test at
4.
the terminals:
Door Closed -
∞
•
Ω
Door Open - 0
•
Ω
a. Connect a temporary jumper across the
relay contacts and the primary switch to
simulate shorted switch contacts. Locate
convenient connections in the circuit to
be certain the COM and N.O. terminals are
used.
b. Connect an ohmmeter (Low Scale) across
the two line terminals of the appliance
power cord. Continuity must show:
Door Closed - Some
•
Ω
Door Open - 0
•
Ω
c. Remove the 20-Amp. fuse - the circuit must
open (
∞
Ω
). If not, check the wiring of the
monitor and interlock circuits.
7. After the test, remove the temporary jumpers
and reconnect the monitor switch leads.
PRIM
ARY
MONITOR SW
DOOR SENSING
SW
TOP SW.
BKT.ADJ.
BOTTOM SW.
BKT.ADJ.
To adjust the interlocks:
The switch housing is adjustable for door
fi
t and
switch operation.
Disconnect power to the oven.
1.
Open the control panel.
2.
Discharge the capacitor.
3.
Loosen the 2 Phillips-head screws that attach
4.
the door switch bracket to the oven frame.
Adjust the switch bracket for proper switch
5.
operation and door
fi
t. Retighten screws.
Check for microwave leakage after any
6.
adjustment and distance between the door and
cavity of the microwave.
5. Reconnect the switch wiring.
6. Test the circuit operation:
