SiUS181305E
Method of Replacing Inverter’s Power Transistors Modules
Troubleshooting
228
Power module checking
When using the digital type of multiple tester, make measurement in diode check mode.
There needs to be none of each value variation.
The following abnormalities are also doubted besides the PCB abnormality.
h
Defective compressor (ground fault, ground leakage)
h
Defective fan motor (ground leakage)
Tester terminal
Criterion
Remark
+
–
C+
U
Not less than 0.3 V
(including
)
It may take time to
determine the voltage due
to capacitor charge or else.
V
W
U
C–
Not less than 0.3 V
(including
)
V
W
U
C+
0.3 ~ 0.7 V
(including
)
V
W
C–
U
0.3 ~ 0.7 V
(including
)
V
W
