Power Supply Waveforms Check - Daikin FTK25JVE9 Service Manual

Si04-115
6.1.7

Power Supply Waveforms Check

Check No.13 Measure the power supply waveform between pins 1 and 3 on the terminal board, and check
the waveform disturbance.
"
"
[Fig.1]
6.1.8 Inverter Units Compressor/Refrigerant System Check
Check No.15
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)
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Compressor/refrigerant system
check
Does
the equipment stop
frequency due to startup
error?
NO
[Fig.2]
∗ Check if there are any damage on refrigerant piping.
YES
Check
Faulty compressor.
Replace the compressor.
To next step.
(R1967)
91