Check Method Of Dc Fan Motor - Mitsubishi Electric Mr.Slim PUHZ-P100VKA Service Manual

Check method of DC fan motor (fan motor / outdoor controller circuit board)
Notes
1
· High voltage is applied to the connecter (CNF1) for the fan motor. Pay attention to the service.
· Do not pull out the connector (CNF1) for the motor with the power supply on.
(It causes trouble of the outdoor controller circuit board and fan motor.)
Self check
2
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)
Is there contact failure?
No
Power supply check (Remove the connector (CNF1))
1Turn off the breaker and turn on the SW6-3.
2Disconnect the connector (CNF1).
3Turn on the breaker to start test run.
4Measure the voltage in the outdoor controller circuit board.
TEST POINT 1 : V (between 1 (+) and 4 (-) of the fan connector): V
DC
TEST POINT
2 : V (between 5 (+) and 4 (-) of the fan connector): V
CC
TEST POINT
3 : V (between 6 (+) and 4 (-) of the fan connector): V
SP
5Turn off the breaker and turn off the SW6-3.
Is the voltage normal?
No
Replace outdoor
controller board.
Check the operation.
Fail
Replace the defective fan motor
OCH670
Replace outdoor controller board (C.B)
Yes
and fan motor (MF1).
Recover wiring.
Yes
Replace the defective fan motor
Yes
Check the operation of fan.
Replace outdoor controller board.
OK
END
55
250-380 V DC
DC
15 V DC
CC
6.5 V DC
SP
Yes OK
Fail
END