Check Method Of Dc Fan Motor; Fuse Check - Mitsubishi Electric PUMY-P112VKM1 Service Manual

Check method of DC fan motor (fan motor/outdoor multi controller circuit board)
Notes
1
· High voltage is applied to the connecter (CNF1, 2) for the fan motor. Pay 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 multi controller circuit
Self check
2
Symptom : The outdoor fan cannot rotate.

Fuse check

Check the fuse (F500) on outdoor
multi controller circuit board.
Did the fuse blow?
No
Wiring contact check
Contact of fan motor connector (CNF1, 2)
Is there contact failure?
No
Power supply check (Remove the connector (CNF1, 2))
Measure the voltage in the outdoor controller circuit
TEST POINT 1 : V (between 1 (+) and 4 (−) of the fan connector): V
DC
: 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
Is the voltage normal?
No
Replace the outdoor multi
controller circuit board.
Check the operation.
NG
Replace the fan motor.
OCH576
board and fan motor.)
Replace the outdoor multi controller circuit board
Yes
(MULTI.B.) (C.B)
Recover wiring.
Yes
board.
DC
Replace the fan motor.
Yes
Check the operation of fan.
Replace the outdoor multi controller circuit board.
OK
END
and fan motor (MF1, 2).
310–340 V DC (Y)
DC
280–340 V DC (when ACTM stops), 350 V DC (when ACTM is operating) (V)
15 V DC
CC
Yes
NG
116
OK
END