Check Method Of Dc Fan Motor; The Outdoor Fan Cannot Turn Around; How To Check The Components - Mitsubishi Electric PUHZ-SW75VHA Service Manual

Check method of DC fan motor (fan motor/outdoor controller circuit board)
Notes
· 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 controller circuit
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 contact failure?
No
Power supply check (Remove the connector (CNF1, 2))
Measure the voltage in the outdoor controller circuit
TEST POINT
: V
DC
TEST POINT
: V
CC
Is the voltage normal?
No
Replace outdoor
controller board.
Check the operation.
NG
Replace the fan motor.

10-6. HOW TO CHECK THE COMPONENTS

<HIGH PRESSURE SENSOR>
Vout (V)
4.5
2.5
0.5
OCH533A
Replace outdoor controller board (C.B)
Yes
and fan motor (MF1, 2).
Recover wiring.
Yes
(between 1 (+) and 4 (-) of the fan connector): V
(between 5 (+) and 4 (-) of the fan connector): V
Yes
OK
END
2.5 5
PRESSURE
(MPa)
board and fan motor.)
board.
DC250~330V
DC
DC15V
CC
Replace the fan motor.
Yes
Check the operation of fan.
NG
Replace outdoor controller board.
MULTI
CONTROLLER BOARD
WHT
BLU
Vout
BLK
63HS
- : 5V (DC)
- : Output Vout (DC)
41
OK
END
5V DC
3
2
MICRO
PROCESSOR
1
GND