Daikin FTXS09HVJU Service Manual page 161

SiUS04-904
5.1.11 Power Transistor Check
 Checking the power transistor
Check No.13
 Never touch any live parts for at least 10 minutes after turning off the circuit breaker.
 If you cannot avoid to touch a live part, make sure that the power transistor's supply voltage is
 For the UVW, make measurements at the terminal on the PCB or the relay connector.
Tester's negative terminal
Tester's positive terminal
Normal resistance
Abnormal resistance
5.1.12 Main Circuit Electrolytic Capacitor Check
 Checking the main circuit electrolytic capacitor
Check No.15
 Never touch any live parts for at least 10 minutes after turning off the circuit breaker.
 If you cannot avoid touching a live part, make sure that there is no DC voltage using the tester.
 Check the continuity with the tester. Reverse the pins and make sure there is continuity.
150
below 50 V using the tester.
Power transistor
UVW
(+)
Power transistor
UVW
(+)
Several k to several M
0 or 
Power transistor
UVW
(–)
Power transistor
UVW
(–)
malfunctions
Service Diagnosis
Check