38MGRBQ: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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Index 1:
1. Indoor AC Fan Motor
Power on the unit and set the unit running in fan mode at the high fan speed. After running for 15 seconds, measure the voltage of pin1 and pin2.
If the value of the voltage is less than 100V (208~240V power supply) or 50V(115V power supply), the PCB has an issue and needs to be
replaced.
2. Indoor DC Fan Motor (Control Chip is inside the fan motor)
Power on and when the unit is in standby, measure the voltage of pin1-pin3, pin4-pin3 in the fan motor connector. If the voltage value is not in the
range shown in table, the PCB has an issue and needs to be replaced.
For other models:
DC motor voltage input and output
NO. COLOR SIGNAL VOLTAGE
1 Red Vs/Vm 200V~380V
2 --- --- ---
3BlackGND0V
4 White Vcc 13.5-16.5V
5 Yellow Vsp 0~6.5V
6 Blue FG 13.5-16.5V
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