Daikin ATX35J3V1B [98/116] Power supply waveforms check

Check SiBE041010EA

87 Service Diagnosis

5.3 Power Supply Waveforms Check

Check No.11 Measure the power supply waveform between No. 1 and No. 2 on the terminal board, and check

the waveform disturbance.



Check if the power supply waveform is a sine wave. (Fig.1)

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Check if there is waveform disturbance near the zero cross. (sections circled in Fig.2)

5.4 Electronic Expansion Valve Check

Check No.12 Conduct the followings to check the electronic expansion valve (EV).

1. Check if the EV connector is correctly connected to the PCB.

2. Turn the power off and on again, and check if the EV generates a latching sound.

3. If the EV does not generate a latching sound in the above step 2, disconnect the connector

and check the continuity using a tester.

4. Check the continuity between the pins 1 - 6, 3 - 6, 2 - 5, 4 - 5 (between the pins 1 - 6, 2 - 6, 3 - 6,

4 - 6 for the harness 5P models). If there is no continuity between the pins, the EV coil is faulty.

5. If the continuity is confirmed in step 3, the outdoor unit PCB is faulty.

Note: Please note that the latching sound varies depending on the valve type.

Fig.1 Fig.2

(R1736)

(R1444)

Harness 6P

6P Connector

CheckS20

1 - 6

3 - 6

2 - 5

4 - 5

1 2 3 4 5 6

(R16385)

Harness 5P

6P Connector

(5)

CheckS20

1 - 6

2 - 6

3 - 6

4 - 6

1 2 3 4 5 6

(R16386)