Mitsubishi Electric PUZ-SWM60VAA Service Manual page 40

Check method of DC fan motor (fan motor/outdoor controller circuit board)
Notes
1
· High voltage is applied to the connector (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
Self check
2
Symptom: The outdoor fan cannot rotate.
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
Fan motor check (CNF1)
Is the resistance abnormal?
No
Power supply check (Remove the connector (CNF1))
Measure the voltage in the outdoor controller circuit
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
Is the voltage normal?
No
Replace outdoor
controller board.
Check the operation.
Fail
Replace the defective fan motor.
9-5. HOW TO CHECK THE COMPONENTS
<HIGH PRESSURE SENSOR>
Vout (V)
4.5
2.5
0.5
OCH809A
Yes
Replace outdoor controller board (C.B)
and fan motor (MF1).
SWM60/80
UNIT
SHWM60/80
FAN MOTOR BH61J064
Measuring points Resistance
pin1–pin4
pin5–pin4 1.1 MΩ
pin6–pin4
pin7–pin4
Yes
Replace the defective fan motor
board.
Yes
Replace the defective fan motor.
Check the operation of fan.
OK
Replace the outdoor controller board.
COMPLETE
PRESSURE
2.5 5
(MPaG)
(PSI)
board and fan motor.)
SWM100/120
SHWM100/120/140
BH61J065
Resistance
1.1 MΩ
40 kΩ 40 kΩ
280–380 VDC
DC
15 VDC
CC
Yes OK
Fail
MULTI
CONTROLLER BOARD
5 VDC
3
WHT
2
BLU
Vout
1
BLK
63HS
3-1: 5 V (DC)
2-1: Output Vout (DC)
40
COMPLETE
MICRO
PROCESSOR
GND