Mars Comfort-Aire Century VCD-SA Series Service Manual page 129

Service Manual - VCDxxSA
Index:
1. Indoor DC Fan Motor(control chip is in fan motor)
Power on and when the unit is in standby, measure the voltage of pin1&pin2 of CN15, pin3 of CN34 in fan motor
connector. If the value of the voltage is not in the range showing in below table, the PCB must has problems and need to
be replaced.
CN34
CN15
2. Outdoor DC Fan Motor (control chip is in outdoor PCB)
Release the UVW connector. Measure the resistance of U-V, U-W, V-W. If the resistance is not equal to each other, the
fan motor must has problems and need to be replaced. otherwise the PCB must has problems and need to be replaced.
NO. Color
1 /
2 Black
3 Orange
4 Blue
NO. Color
1 Yellow
2 Black
3 Yellow-Green
Troubleshooting 26

Signal Voltage
/
GND
PWM 5-12VDC
FG 0-12VDC
Signal Voltage
208/230VAC
208/230VAC
GND
