Power Supply Waveforms Check - Daikin FTXG25CVMAW Service Manual

Si04-402A
5.1.8

Power Supply Waveforms Check

Check No.10 Measure the power supply waveform between pins 1 and 3 on the terminal board, and check
the waveform disturbance.
[Fig.1]
5.1.9 Inverter Units Refrigerant System Check
Check No.11
Refrigerant system check
Check for gas leaks.
See the section on insufficient gas
detection.
Service Diagnosis
Check to see if the power supply waveform is a sine wave (Fig.1).
Check to see if there is waveform disturbance near the zero cross (sections circled in Fig.2)
Is
the discharge
thermister disconnected from
the holder?
NO
Is any moisture
found in sight glass.
NO
YES
[Fig.2]
YES
YES
Conduct the check after operating the
equipment for a sufficient length of time.
Check
Correct the problem.
Conduct vacuum drying.
Replace the refrigerant.
(R1445)
109