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RIBBON TEST
The ribbon is a 10-conductor connection between the push button and the PCB. To test the continuity of the
ribbon from the push button through the ribbon receptacle (located at the left side track) to the PCB location:
1. Access the PCB, then disconnect the ribbon from CN5. (See
Power Supply Housing.
)
2. Remove the push button, then disconnect the ribbon. (See
Push-Button Assembly.)
3. Check continuity of each individual ribbon conductor.
Note:
Numbers in illustrations below represent and identify individual ribbon conductors.
Speed
Test Wires
Wires Jumped
Resistance (ohms)
+/- 5% at 68°F (20°C)
1
red-black
blue-orange
20.6
2
red-black
white-orange
14.4
3
red-white
white-orange
7.6
BOOST
red-black
black-orange
7.6
MOTOR TEST CHART
FAN MOTOR TEST
The fan motor is a 2 pole induction capacitor motor. To test the resistance values of the fan motor windings:
1. Access the PCB, then disconnect the fan harness from CN1 (See
Power Supply Housing
).
Note:
Jump, then test each speed individually.
2. Jump fan harness wires, indicated in motor test chart, using appropriate jumper wire.
3. Check for proper resistance at the fan harness test wires.
6
4
1
2
3
9
7
5
8
10
Terminal End of Ribbon at PCB
Guide
Terminal End of Ribbon at Push Button
1
4
5
6
7
10
8
3
9
2
Guide