– 40 –
To test the door interlocks:
1. Disconnect power to the oven.
2. Open the control panel.
3. Discharge the capacitor.
4. Check continuity of
Common
and
Normally Open
:
• Door closed – 0
• Door open –
∞
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:
1. Disconnect power to the oven.
2. Open the control panel.
3. Discharge the capacitor.
4. Disconnect the monitor switch leads and test
at the terminals:
• Door closed –
∞
• Door open – 0
5. Reconnect the switch wiring.
6. Test the circuit operation:
a. Connect a temporary jumper across the
relay contacts and primary switch to
simulate shorted switch contacts. Locate
convenient connections in the circuit to
be certain Common and Normally Open
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
• Door open – 0
c. Remove the 20-amp fuse – the circuit must
open (
∞
). If not, check the wiring of the
monitor and interlock switch circuits.
7. After the test, remove the temporary jumper
leads from the interlocks and relay. Reconnect
the monitor switch leads and reinstall the fuse.
8. Replacement of any parts in monitor circuit
requires repeating this entire test procedure.
The switch housing is not adjustable. It is
fi
xed on
the front cavity with two screws.
Caution:
Check for microwave leakage after
replacing or adjusting door, interlock switches, or
switch mounting block.
Main Fuse
WARNING:
When the 20-amp fuse is blown due
to operation of the monitor switch, the monitor
switch must be replaced. Also replace relays and/
or interlock switches when continuity check shows
contacts are shorted.
Door Interlocks
(Door Latch Switches)
The interlocks are designed as follows:
Primary interlock switch – Bottom switch
operated by bottom latch pawl connected to
line (L) leg.
Door Sense Switch
Monitor Switch
Primary Interlock
Switch
Latch Pawl
Door Sense
Switch (top)
Interlock Monitor
Switch (middle)
Primary Interlock
Switch (bottom)
Bottom Lever
Summary of Contents for Appliances DVM1950
Page 37: ... 37 Troubleshooting PCB ...
Page 43: ... 43 Schematics and Wiring Diagrams Continued next page PVM2170 Schematic Diagram ...
Page 44: ... 44 PVM2170 Wiring Diagram Continued next page ...
Page 45: ... 45 DVM1950 JNM1951 JVM1950 PVM1970 PNM1971 Schematic Diagram Continued next page ...
Page 46: ... 46 DVM1950 JNM1951 JVM1950 PVM1970 PNM1971 Wiring Diagram ...
