Mitsubishi Electric MR. SLIM PUZ-M100VKA2, Service Manual, Page: 52 / 116

52
OCH773
Notes
· 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 board and fan motor.)
Self check
Symptom: The outdoor fan cannot turn around.
1
2
Check method of DC fan motor (fan motor / outdoor controller circuit board)
Fail
Fail
Wiring contact check
Contact of fan motor connector (CNF1)
Fuse check
Check the fuse (F5) on outdoor
controller board.
Power supply check (Remove the connector (CNF1))
3
Turn on the breaker to start test run.
TEST POINT
1
: V
DC
(between 1 (+) and 4 (-) of the fan connector): V
DC
250-380 V DC
TEST POINT
2
: V
CC
(between 5 (+) and 4 (-) of the fan connector): V
CC
15 V DC
Correct the wiring.
Replace outdoor controller board.
Replace outdoor controller board (C.B)
and fan motor (MF1).
Replace outdoor
controller board.
Is the voltage normal?
Is there contact failure?
Yes
No
Did the fuse blow?
No
Yes
Check the operation of fan. Complete.
Complete.
Yes
OK
Check the operation.
OK
Yes
No
Replace the defective fan motor.
Replace the defective fan motor.
TEST POINT
3
: V
SP
(between 6 (+) and 4 (-) of the fan connector): V
SP
6.5 V DC
5
Turn off the breaker and turn off the SW6-3.
2
Disconnect the connector (CNF1).
1
Turn off the breaker and turn on the SW6-3.
4
Measure the voltage in the outdoor controller circuit board.
UNIT M100-140
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 ∞
Fan motor check (CNF1, 2)
Replace the fan motor.
Is the resistance abnormal?
Yes
No