Mitsubishi Electric PUZ-WZ50VAA Service Manual page 50

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
<PRESSURE SENSOR>
Vout (V)
4.5
2.5
0.5
OCH816
Yes
Replace the outdoor controller board (C.B)
and the defective fan motor (MF1).
WZ50/WZ60/WZ80
UNIT
FAN MOTOR BH61J064
Measuring points Resistance
pin1–pin4
pin5–pin4 1.1MΩ
pin6–pin4
pin7–pin4
Yes
Replace the defective fan motor.
board.
Yes
Replace the defective fan motor.
OK
Replace the outdoor controller board.
Complete.
PRESSURE
2.5 5
(MPaG)
(PSI)
board and fan motor.)
40kΩ
280–380 V DC
DC
15 V DC
CC
Yes
Check the operation of fan.
Fail
MULTI
CONTROLLER BOARD
5 V DC
3
WT
2
BU
Vout
1
BK
63HS
3-1 : 5 V (DC)
2-1 : Output Vout (DC)
50
OK
Complete.
MICRO
PROCESSOR
GND