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Door Switch Removal
1. Remove the Control Panel Assembly. (See
Control Panel Removal
.)
2. Disconnect wiring to the door switches.
3. Remove the 2 Phillips-head screws that attach
the plastic latch bracket to the microwave oven
frame. Remove the latch bracket.
Primary Interlock Switch
Door Sensing Switch
Monitor Switch
Latch
Bracket
4. Using a small
fl
at blade screwdriver, release the
tabs and remove the door switch from the latch
bracket.
Damper Switch
• Location - Behind the Control Panel Assembly
next to oven cavity.
• Part of the Damper Assembly.
• The damper switch is used for a timing event.
When the damper door is closed and then
opened, a timer is triggered on the Smart Board.
The damper motor will run until the timer has
timed out. This time-based motor operation is
used for both opening and closing the damper.
• Switch is open when the damper door is closed.
• When the damper door is closed, 5 VDC can be
read between pins 3 and 4 of CN7, when the
damper door is open, voltage goes to 0 VDC.
Troubleshooting
1. Disconnect power to the microwave.
2. Remove the Control Panel Assembly. (See
Control Panel Removal
.)
3. Manually open the damper door.
4. Check resistance between pins 3 and 4 of the
connector that connects to Smart Board CN7.
• If resistance is approximately 0
Ω
, go to step 5.
• If resistance is in
fi
nite, problem is with the
Damper Switch or wiring to switch.
5. While still checking resistance between pins
3 and 4, manually close and keep closed the
damper door.
• If resistance is in
fi
nite, the Damper Switch is
operating properly, replace the Smart Board.
• If resistance is approximately 0
Ω
, problem
is with the Damper Switch or engagement of
the switch.
To remove the damper switch:
(See
Damper Assembly Removal
.
)
