Mitsubishi Electric PLFY-P32VBM-E Service Manual page 22

9-1-3. DC Fan motor (fan motor / indoor controller board)
Check method of indoor fan motor (fan motor / indoor controller board)
1
Notes
· High voltage is applied to the connecter (CNMF) for the fan motor. Give attention to the service.
· Do not pull out the connector (CNMF) for the motor with the power supply on.
(It causes trouble of the indoor controller board and fan motor)
2 Self check
Conditions : The indoor fan cannot turn around.
Wiring contact check
Contact of fan motor connector (CNMF)
Contact of power supply cable
Was contact caused good?
Yes
Power supply check (Remove the connector (CNMF))
Measure the voltage in the indoor controller circuit
1 : V
TEST POINT
DC
2 : V
TEST POINT
CC
Is the voltage normal?
Yes
Fan motor position sensor signal check
Turn around the fan motor more than one revolution slowly, and check
the voltage TEST POINT4 V
Does the voltage repeat DC0V and DC15V?
Yes
Replace the indoor controller board.
Wiring recovery
NO
(between 1 (+) and 4 (-) of the fan connector): V
(between 5 (+) and 4 (-) of the fan connector): V
Trouble of the indoor controller board
NO
Replace the indoor controller board.
(between 7(+) and 4(-)).
FG
board.
DC310~340V
DC
DC15V
CC
Trouble of the fan motor
NO
Replace the motor.
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