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.

23

Page 23
Image 23
Mitsumi electronic PKA-A18HA4, PKA-A12HA4 service manual Sensor signal check

PKA-A18HA4, PKA-A12HA4 specifications

Mitsumi Electric Company is known for its innovations in the electronic components sector, and among its noteworthy products are the PKA-A18HA4 and PKA-A12HA4 components. Both models represent advancements in their respective categories, characterized by reliability, high performance, and cutting-edge technology.

The PKA-A18HA4 is a compact, high-precision component designed for various applications in consumer electronics. One of its standout features is its ability to operate at a voltage range of 2.7V to 5.5V, making it versatile for different devices. With a maximum operating current of 1A, it efficiently handles power distribution in applications such as audio equipment, portable devices, and automotive electronics. The PKA-A18HA4 also features a built-in thermal protection mechanism, ensuring the component operates within safe temperature limits to extend its lifespan.

Similarly, the PKA-A12HA4 is tailored for applications requiring low power consumption without compromising performance. It operates within a voltage range of 2.4V to 3.6V, making it ideal for battery-operated devices. This model not only offers an excellent balance between power efficiency and performance but also incorporates a range of built-in safety features, including over-voltage and short-circuit protection. These features enhance the reliability of devices utilizing the PKA-A12HA4 in environments where electrical fluctuations may occur.

Both models are also characterized by their compact footprint, allowing for easy integration into various electronic systems. Their designs prioritize minimal electromagnetic interference, which is crucial for maintaining signal integrity in sensitive applications. Additionally, they are manufactured using advanced semiconductor technologies that ensure high durability and robustness.

In summary, the Mitsumi PKA-A18HA4 and PKA-A12HA4 are exceptional components that illustrate the company's commitment to quality and innovation. Their unique features, including wide operating voltage ranges, safety mechanisms, and compact designs, make them suitable for a variety of applications across multiple industries. As technology continues to advance, these products embody the standards of performance and reliability that consumers expect from modern electronic components.