Mitsubishi Electric City Multi PLFY Series Technical & Service Manual page 22

8-2-3. DC Fan Motor (Fan Motor/Indoor Controller Board)
Check method of indoor fan motor (fan motor/indoor controller board)
Notes
1
· High voltage is applied to the connecter (CNMF) for the fan motor. Pay attention to the service.
· Do not pull out the connector (CNMF) for the motor with the power supply on.
(It causes trouble of the indoor controller board and fan motor.)
Self check
2
Conditions : The indoor fan cannot turn around.
Indoor controller board fuse check
Is the fuse normal?
Yes
Wiring contact check
Contact of fan motor connector (CNMF)
Is there contact failure?
No
Power supply check (Remove the connector (CNMF))
Measure the voltage in the indoor controller circuit
TEST POINT
1 : V
TEST POINT
2 : V
Is the voltage normal?
No
Replace the indoor
controller board.
Check the operation.
Fail
Replace the defective fan motor.
TCH061
TCH061.indd 22 TCH061.indd 22
Is the resistance
between the terminals of
drain pump normal?
Replace the drain pump.
Yes
Correct wiring.
board.
(between 1 (+) and 4 (−) of the fan connector): V
DC
(between 5 (+) and 4 (−) of the fan connector): V
CC
Yes
Replace the defective fan motor.
Replace the indoor controller board.
OK
Complete.
No
310–340 V DC
DC
15 V DC
CC
Check the operation of fan.
Fail
22
Replace the defective fan motor.
Replace the indoor controller board.
OK
Complete.
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