Mitsubishi Electric MUZ-JP09WA-U1 Service Manual page 31

I Check of outdoor fan motor
Check the connection between the
connector CN931 and CN932.
Disconnect the connectors CN931
and CN932 from the inverter P.C.
board.
Is the resistance between each ter-
minal of outdoor fan motor normal?
(Refer to 10-4.)
No
Replace the outdoor fan motor.
OBH821A
Yes
(Fixed to either 5 or 0 V DC)
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
No
DC repeatedly?
Does the outdoor fan motor rotate smoothly?
No
Replace the inverter P.C. board.
31
Yes
Yes