Mitsumi electronic PKA-A18HA4 Is the voltage normal?, Sensor signal check, Replace, the fuse

9-6-2. DC Fan motor (fan motor/indoor controller circuit board)

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

Notes

·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 circuit board and fan motor.)

Self check

Symptom : The indoor fan cannot rotate.

Wiring contact check

Contact of fan motor connector (CNMF)

Is there contact failure? Yes Wiring recovery

No

Power supply check (Remove the connector (CNMF))

Measure the voltage in the indoor controller circuit board.

TEST POINT : VDC (between 1 (+) and 3 (-) of the fan connector): VDC DC294~325V

TEST POINT  : VCC (between 4 (+) and 3 (-) of the fan connector): VCC DC15V

Is the voltage normal? No

Yes

Sensor signal check

Measure the voltage between CNMF  and  DC 0V and DC 15V in the indoor controller circuit board.

Indoor controller board fuse check

Is the fuse normal?		No	Replace
			the fuse.
Yes
			OK
Replace the indoor	NG
		Check the operation
controller board.
		OK
Check the operation		END

NG

Replace the fan motor.

END

Does the voltage repeat	No
DC 0V and DC 15V?
Yes
Replace the indoor
controller board.
	OK
Check the operation	END
NG
Replace the fan motor.

Replace the fan motor.

YesOK

Check the operation of fan. END

NG

Replace the indoor controller board.

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