Service Manual

SiUS181631EA Method of Replacing Inverter’s Power Transistors Modules
Troubleshooting 271
Power module checking
When using the digital type of multimeter, 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)
Multimeter 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