Daikin ERQ, Service Manual

Page: 246 / 260

Method of Replacing the Inverter’s Power Transistors Modules ESIE09-05
236 Appendix
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 PC board abnormality.
•
Faulty compressor (ground fault, ground leakage)
• Faulty fan motor (ground leakage)
Tester terminal Criterion Remark
+ -
C+ U Not less than 0.3V
(including ∞ )*
It may take time to
determine the voltage
due to capacitor
charge or else.
V
W
U C- Not less than 0.3V
(including
∞
)*
V
W
U
C+ 0.3 to 0.7V
(including
∞
)*
V
W
C-
U 0.3 to 0.7V
(including ∞ )*
V
W
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