Mitsubishi Mr.Slim MUY-GE09NA, Service Manual, Page: 32 / 48

32
I Check of outdoor fan motor
Is the resistance of outdoor fan motor normal?
(Refer to 10-4.)
Replace the outdoor fan motor.
Replace the inverter P.C. board.
No
Yes
Disconnect CN932 from the inverter P.C. board,
and measure the resistance of the outdoor fan
motor.
MUZ-GE09/12/15NA MUY-GE09/12/15NA
Is the resistance between each ter-
minal of outdoor fan motor normal?
(Refer to 10-4.)
Check the connection between the
connector CN931 and CN932.
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
VDC repeatedly?
Does the outdoor fan motor rotate smoothly?
Replace the outdoor fan motor.
Replace the inverter P.C. board.
Yes
Yes
No
(Fixed to either 5 or 0 VDC)
No
No
Yes
MUZ-GE18NA MUY-GE18NA