Mitsubishi Electric MUZ-DW25VF-E1 Service Manual page 40

I Check of outdoor fan motor
Disconnect the connectors CN931 and CN932 from the inverter P.C. board.
Check the connection between the connector CN931 and CN932.
Is the resistance between each terminal of outdoor fan motor normal?
(Refer to 12-4.)
Disconnect CN932 from the inverter P.C. board, and turn on the power supply.
Rotate the outdoor fan motor manually and measure the voltage of CN931.
Between 1(+) and 5(-)
Between 2(+) and 5(-)
Between 3(+) and 5(-)
Does the voltage between each terminal become 5 and 0 V DC repeatedly?
Does the outdoor fan motor rotate smoothly?
Replace the inverter P.C. board.
OBH906A
Yes
Yes
Yes
No
(Fixed to either 5 or 0 V DC)
No
No
Replace the outdoor fan motor.
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