Mitsubishi Electric PLFY-P20VEM-E Technical & Service Manual page 25

8-1-3. DC Fan motor (fan motor/indoor controller board)
Check method of indoor fan motor (fan motor/indoor controller board)
Notes
1
· High voltage is applied to the connector (CNMF) for the fan motor. Pay attention to the service.
· Do not pull out the connecter (CNMF) for the motor with the power supply on.
(It causes trouble of the indoor controller board and fan motor)
Self check
2
Conditions : The indoor fan cannot rotate.
Indoor controller board fuse check
Is the fuse normal?
Yes
Wiring contact check
Contact of fan motor connector (CNMF)
Is there contact failure?
No
Power supply check (Remove the connector (CNMF))
Measure the voltage in the indoor controller circuit
TEST POINT
1 : V
DC
TEST POINT
2 : V (between 5 (+) and 4 (-) of the fan connector): V
CC
Is the voltage normal?
No
Replace indoor
controller board
Check the operation
Fail
Replace the fan motor.
OCH657
Is the resistance
between the terminals of
drain pump normal?
Replace the drain pump.
Yes
Wiring recovery
board.
(between 1 (+) and 4 (-) of the fan connector): V
Yes
Replace indoor controller board.
OK
END
No
310–340 V DC
DC
15 V DC
CC
Replace the fan motor.
Check the operation of fan.
Fail
25
Replace the fan motor.
Replace the indoor controller board.
OK
END