Dc Fan Motor (Fan Motor/Indoor Control Board - Mitsubishi Electric PVFY-P12 Service Manual

2. DC fan motor (fan motor/indoor control board

1. CAUTION
A high voltage is applied to the connector for connection to the fan motor (CNMF).
•
Do not unplug the connector CNMF with the unit energized to avoid damage to the indoor control board and
•
fan motor.
2. Troubleshooting
Symptom : The indoor fan cannot turn around.
Check the fuse (FUSE) on indoor
controller board.
Did the fuse blow?
No
Wiring contact check
Contact of fan motor connector (CNMF)
Is there no contact failure?
Yes
Power supply check (Remove the connector (CNMF))
Measure the voltage in the indoor 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 indoor
controller board.
Check the operation.
NG
Replace the fan motor.
P12,18,24,30,36
Measuring points
pin 1 - pin 4
pin 5 - pin 4
pin 6 - pin 4
pin 7 - pin 4
*To measure the resistance, connect
the negative (-) end of the tester to pin 3.
Specifications are subject to change without notice.
Check the drain pump (DP)
Yes
Is the resistance between
terminals normal?
Replace drain pump (DP).
Wiring recovery
No
board.
Yes Measure the resistance of the fan motor.
Is the resistance of the fan motor
normal?(Refer to below table)
OK
END Does the fan motor rotate smoothly?
Turn OFF the power supply and
connect the connector CNMF.
Turn ON the power supply and
measure the voltage of connector
CNMF while rotaing the motor by
the hand.
Does the voltage between pin 7 and pin 4
of connector CNMF repeat 0V and 5V?
Check the operation of fan.
Replace indoor controller board.
PVFY- PVFY-
P48,54
NAMU-E1 NAMU-E1
Resistance
O.L. 1MΩ
50kΩ 47kΩ
150kΩ 143kΩ
O.L. O.L.
Yes
No
DC310~340V
DC
DC15V
CC
No
Yes
No
Yes
No
Yes
OK
END
NG
33
Replace indoor controller board (I.B).
Replace fan motor (MF).
Replace the fan motor.
Yes
OK
Check the operation of fan.
NG
Replace indoor controller board.
© 2017 Mitsubishi Electric US, Inc.
END