Indoor Or Outdoor Dc Fan Motor; Dc Motor Voltage Input And Output; Outdoor Dc Fan Motor; Indoor Ac Fan Motor - Midea MSMBB-12CRDN1-MP0W Service Manual

Index 1:
1:Indoor or Outdoor DC Fan Motor(control chip is in fan motor)
Power on and when the unit is in standby, measure the voltage of pin1-pin3, pin4-pin3 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.
DC motor voltage input and output(voltage: 220-240V~)
NO. Color
1 Red
2 ---
3 Black
4 White
5 Yellow
6 Blue
DC motor voltage input and output(voltage :115V~)
NO. Color Signal
1 Red Vs/Vm
2 ---
3 Black
4 White
5 Yellow
6 Blue
2. Outdoor DC Fan Motor (control chip is in outdoor PCB)
Power on ,and check if the fan can run normally, if the fan can run normally, the PCB must has
problems and need to be replaced, If the fan can't run normally, measure the resistance of each two
pins. If the resistance is not equal to each other, the fan motor must have problems and need to be
replaced, otherwise the PCB must has problems and need to be replaced.

3. Indoor AC Fan Motor

Power on and set the unit running in fan mode at 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
Signal Voltage
Vs/Vm 280V~380V
---
GND
Vcc 14-17.5V
Vsp 0~5.6V
FG 14-17.5V
Voltage
140V~190V
--- ---
GND 0V
Vcc 14-17.5V
Vsp 0~5.6V
FG 14-17.5V
---
0V
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