Check method of DC fan motor (fan motor / outdoor controller circuit board)

1Notes

·High voltage is applied to the connecter (CNF1, 2) for the fan motor. Give 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.)

2Self check

Symptom : The outdoor fan cannot turn around.

Fuse check

Check the fuse (F5) on outdoor controller board.

Did the fuse blow?

Yes

Replace outdoor controller board (C.B)

and fan motor (MF1, 2).

 

 

No

 

 

Wiring contact check

Contact of fan motor connector (CNF1, 2)

Is there no contact failure?

No

Wiring recovery

Yes

Power supply check (Remove the connector (CNF1, 2))

Measure the voltage in the outdoor controller circuit board.

TEST POINT 1 : VDC (between 1 (+) and 4 (-) of the fan connector): VDC DC250~330V

TEST POINT 2 : VCC (between 5 (+) and 4 (-) of the fan connector): VCC DC15V

Is the voltage normal?

Yes

Replace the fan motor.

 

No

 

Yes

OK

 

Check the operation of fan.

END

Replace outdoor

 

 

NG

 

controller board.

 

 

 

 

 

 

OK

Replace outdoor controller board.

 

 

 

 

Check the operation.

END

 

 

NG

 

 

 

Replace the fan motor.

 

 

 

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Mitsubishi Electronics PUZ-A30NHA2-BS Fuse check, Wiring contact check, Power supply check Remove the connector CNF1, End
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