GE PANDA Service Manual page 87

4.4.2.3 Lights Stay Dim with Switch Off
Possible Causes
Defective switch in
dimmer pot harness
Defective Power
PCA
4.4.2.4 Lights Are Not Dimmable
Possible Causes
Defective
potentiometer in
dimmer pot harness
Defective
transformer
Service Manual
Step Troubleshooting Procedure
Open rear cover and disconnect harness at
1.
J25 Power PCA.
Using DMM, check resistance on harness pins 3, 6
2. (white wires). Switch Off = Open;
Switch On = < 1 Ohm.
If switch test fails, replace dimmer harness and
3.
re-test.
4. Disconnect transformer connector J24.
Measure AC out across J24 pins 3,4.
5. Dimmer switch OFF = 0V; Dimmer switch
ON = mains voltage
6. If test fails, replace Power PCA.
Step Troubleshooting Procedure
Open rear cover and disconnect harness at J25 on
1.
Power PCA.
Using DMM, check resistance on harness pins 2, 5
2. (blue wires). Resistance range: ~1Meg (dim) to 0
Ohms (bright) as the dimmer knob is rotated.
Connect a new dimmer harness at Power PCA, J25,
3.
and re-test.
4. If problem is fixed, install the new harness.
If dimmer pot is OK, replace the transformer
5.
subassembly.
Chapter 4: Troubleshooting
Troubleshooting Tables
Comments
Wire harness
warmer
observation light
switch part #:
6600-1588-700
Comments
Wire harness
warmer
observation light
switch part #:
6600-1588-700
4-25