Check Method Of Dc Fan Motor - Mitsubishi Electric MXZ-8A140VA Technical & Service Manual

Check method of DC fan motor (fan motor / outdoor controller circuit board)
1 Notes
· High voltage is applied to the connecter (CNF1, 2) for the fan motor. Give attention to the service.
· Do not pull out the connector (CNF1, 2) for the motor with the power supply on.
(It causes trouble of the outdoor controller circuit
2
Self check
Symptom : The outdoor fan cannot turn around.
Fuse check
Check the fuse (F5) on outdoor
controller board.
Did the fuse blow?
No
Wiring contact check
Contact of fan motor connector (CNF1, 2)
Is there no contact failure?
Yes
Power supply check (Remove the connector (CNF1, 2))
Measure the voltage in the outdoor controller circuit
1 : V
TEST POINT
(between 1 (+) and 4 (-) of the fan connector): V
DC
2 : V
TEST POINT
(between 5 (+) and 4 (-) of the fan connector): V
CC
Is the voltage normal?
No
Replace outdoor
controller board.
Check the operation.
NG
Replace the fan motor.
board and fan motor.)
Replace outdoor controller board (C.B)
Yes
and fan motor (MF1, 2).
Wiring recovery
No
board.
Replace the fan motor.
Yes
Check the operation of fan.
Replace outdoor controller board.
OK
END
DC250~330V
DC
DC15V
CC
Yes
NG
54
OK
END