Mitsubishi Electric Mr.SLIM PUZ-M200YKA.UK Service Manual page 52

Check method of DC fan motor (fan motor/outdoor controller circuit board)
1 Notes
· High voltage is applied to the connector (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 board and fan motor.)
2 Self check
Symptom: The outdoor fan cannot rotate.
Fuse check
Check the fuse (F5) on outdoor controller
circuit board.
Did the fuse blow?
No
Wiring contact check
Contact of fan motor connector
, 2
(CNF1 )
Is there contact failure?
No
Fan motor check (CNF1)
Is the resistance abnormal?
No
Power supply check (Remove the connector (CNF1, 2))
Measure the voltage in the outdoor controller circuit board.
TEST POINT 1: V (between 1 (+) and 4 (−) of the fan connector): 250–380 VDC
DC
TEST POINT 2: V (between 5 (+) and 4 (−) of the fan connector): V
CC
Is the voltage normal?
No
Replace the outdoor
controller circuit board.
Check the operation.
Fail
Replace the defective fan motor.
OCH737B
Disconnect the FAN motor
Yes
connector and measure the
resistance of connector pins.
Refer to "10-5. HOW TO
CHECK THE PARTS".
Yes
Correct the wiring.
UNIT M200/250Y
FAN MOTOR BH61J065
Measuring points Resistance
pin 1 - pin 4
pin 5 - pin 4
pin 6 - pin 4
pin 7 - pin 4
Yes
Replace the fan motor.
Yes
Replace the defective fan motor.
Check the operation of fan.
Replace the outdoor controller
circuit board.
OK
Complete.
Is the fan motor normal?
Replace the outdoor controller circuit board (C.B.)
and the defective fan motor (MF1
∞
5.3 kΩ
220 kΩ
∞
15 VDC
CC
Yes
OK
Fail
52
Yes
Replace the outdoor controller
circuit board (C.B.).
No
, 2
).
Complete.