Power Supply Waveforms Check; Electronic Expansion Valve Check - Daikin FTXM-K Series Service Manual

Check
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.
Fig.1
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
4. Check the continuity between the pins 1 - 6, 2 - 6, 3 - 6, 4 - 6. If there is no continuity
5. If the continuity is confirmed in step 3, the outdoor unit PCB is faulty.
99
Check if the power supply waveform is a sine wave (Fig.1).
Check if there is waveform disturbance near the zero-cross (sections circled in Fig.2).
and check the continuity using a multimeter.
between the pins, the EV coil is faulty.
S20
Fig.2
(R1736)
Harness 5P
(5)
Check
6P Connector
1 2 3 4 5 6
(R16386)
SiBE041434E
1 - 6
2 - 6
3 - 6
4 - 6
Service Diagnosis
(R1444)