Service Manual

SiUS071735E Check
Service Diagnosis 100
5.2 Indoor Fan Motor Connector Check
Check No.02 1. Turn the power supply OFF.
2. With the fan motor connector disconnected, measure the resistance between each pin, then
make sure that the resistance is more than the value mentioned in the following table.
5.3 Power Supply Waveforms Check
Check No.11 Measure the power supply waveform between No. 1 and No. 2 on the terminal block, and check the
waveform disturbance.
 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).
Measuring points Judgement
White - Blue 1 MΩ or more
Orange - Blue 100 kΩ or more
Brown - Blue 100 Ω or more
Red - Blue 100 kΩ or more
White
Orange
Brown
Blue
—
—
Red
FG
Vsp
Vcc
GND
—
—
Vdc/Vm
X8A
(R25080)
Fig.1 Fig.2