Mitsubishi Electric MSZ-FD VA Series Service Manual page 45

I Check of outdoor fan motor
MUZ-FD25/35
Disconnect CN932 from the inverter P.C. board,
and measure the resistance of the outdoor fan
motor.
Is the resistance of outdoor fan motor normal?
(Refer to 11-4.)
Replace the inverter P.C. board.
MUZ-FD50
Disconnect CN932 from the outdoor electronic control
P.C. board, and measure the resistance of the outdoor
fan motor.
Is the resistance of outdoor fan motor
normal? (Refer to 11-4.)
No
(Fixed to either 5 or 0 VDC)
Replace the outdoor fan motor.
Yes
Yes
No
No
Replace the outdoor fan motor.
No
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
VDC repeatedly?
Does the outdoor fan motor rotate smoothly?
Replace the outdoor electronic control P.C. board.
45
Yes
Yes