Daikin FTKS50BVMB, Service Manual

Page: 423 / 456

SiEN18-622 Method of Replacing The Inverter’s Power Transistors Modules
Troubleshooting 411
Power module checking
W
V
0.3 to 0.7V
(including
∞
)*
C+ U
V
W
V
W
Not less than 0.3V
(including
∞
)*
C- U
V
W
0.3 to 0.7V
(including
∞
)*
U C-
Remark Criterion
- +
It may take time to
determine the
voltage
due to capacitor
charge or else.
Not less than 0.3V
(including
∞
)*
U C+
Tester terminal
When using the digital type of multiple tester, make measurement in diode
check mode.
The following abnormalities are also doubted besides the PC board abnormality.
z
Faulty compressor (ground fault, ground leakage)
z Faulty fan motor (ground leakage)
*There needs to be none of each value variation.