Power Transistor Check; Main Circuit Electrolytic Capacitor Check - Daikin F-Series Service Manual

Check
5.1.12

Power Transistor Check

Check No.13
Tester's negative terminal Power transistor
Tester's positive terminal
Normal resistance
Abnormal resistance

5.1.13 Main Circuit Electrolytic Capacitor Check

Check No.14
252
Checking the power transistor
Never touch any live parts for at least 10 minutes after turning off the circuit breaker.
If unavoidably necessary to touch a live part, make sure the power transistor's supply
voltage is below 50 V using the tester.
For the UVW, make measurements at the Faston terminal on the PCB or the relay
connector.
Checking the main circuit electrolytic capacitor
Never touch any live parts for at least 10 minutes after turning off the circuit breaker.
If unavoidably necessary to touch a live part, make sure there is no DC voltage using the
tester.
Check the continuity with the tester. Reverse the pins and make sure there is continuity.
UVW
(+)
Power transistor
UVW
(+)
Several kohms to several Mohms
SiBE12-712C
Power transistor
(–)
Power transistor
UVW
0 or ∞
Service Diagnosis
UVW
(–)