Midea U2MRS-12, Руководство по обслуживанию

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Troubleshooting
Electrical Control System 133
the value is not 5V, change the PCB. Otherwise, go to step 3.
3) Rotate the fan by hand, measure the voltage of pin1-5, pin 2-5 and pin 3-5 in feedback signal connector.
If any voltage is not positive voltage fluctuation, the fan motor must has problems and need to be
replaced.
Index2:
1. Indoor DC fan motor(control chip is inside 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 have
problems and need to be replaced.
For other models:
DC motor voltage input and output
NO. Color Signal Voltage
1 Red Vs/Vm 192V~380V
2 --- --- ---
3 Black GND 0V
4 White Vcc 13.5-16.5V
5 Yellow Vsp 0~6.5V
6 Blue FG
15V
For console:
5
4
6
3
2
1
DC motor voltage input and output
NO. Color Signal Voltage
1 Red V
DC
310V
2 --- --- ---
3 White Vcc 15V
4 Blue FG 15V
5 Yellow Vsp 0-7.5V
6 Black GND 0V