51
OCH775
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.
Yes
Yes
Yes
Yes
No
Fail
Fail
OK
OK
No
No
Wiring contact check
Contact of fan motor connector
(CNF1
, 2
)
Power supply check (Remove the connector (CNF1, 2))
Measure the voltage in the outdoor controller circuit board.
TEST POINT
1
: V
DC
(between 1 (+) and 4 (−) of the fan connector): 250–380 VDC
TEST POINT
2
: V
CC
(between 5 (+) and 4 (−) of the fan connector): V
CC
15 VDC
Did the fuse blow?
Is there contact failure?
Is the voltage normal?
Check the operation.
Complete.
Complete.
Check the operation of fan.
Disconnect the FAN motor
connector and measure the
resistance of connector
pins.
Refer to “10-5. HOW TO
CHECK THE PARTS”.
Is the fan motor normal?
Yes
No
Replace the outdoor controller
circuit board (C.B.).
Replace the outdoor controller circuit board (C.B.)
and the defective fan motor (MF1
, 2
).
Correct the wiring.
Replace the defective fan motor.
Replace the defective fan motor.
Replace the outdoor
controller circuit board.
Replace the outdoor controller
circuit board.
Fuse check
Check the fuse (F5) on outdoor controller
circuit board.
Yes
No
Fan motor check (CNF1)
UNIT
M200/250Y
FAN MOTOR
BH61J065
Measuring points
Resistance
pin 1 - pin 4
∞
pin 5 - pin 4
5.3 kΩ
pin 6 - pin 4
220 kΩ
pin 7 - pin 4
∞
Is the resistance abnormal?
Replace the fan motor.
