Daikin ATKS25E2V1B [263/316] Power transistor check

Daikin ATKS25E2V1B [263/316] Power transistor check
Check SiBE12-712C
252 Service Diagnosis
5.1.12 Power Transistor Check
Check No.13
Checking the power transistor
z
Never touch any live parts for at least 10 minutes after turning off the circuit breaker.
z
If unavoidably necessary to touch a live part, make sure the power transistor's supply
voltage is below 50 V using the tester.
z
For the UVW, make measurements at the Faston terminal on the PCB or the relay
connector.
5.1.13 Main Circuit Electrolytic Capacitor Check
Check No.14
Checking the main circuit electrolytic capacitor
z
Never touch any live parts for at least 10 minutes after turning off the circuit breaker.
z
If unavoidably necessary to touch a live part, make sure there is no DC voltage using the
tester.
z
Check the continuity with the tester. Reverse the pins and make sure there is continuity.
Tester's negative terminal
Power transistor
(+)
UVW
Power transistor
(–)
UVW
Tester's positive terminal UVW
Power transistor
(+)
UVW
Power transistor
(–)
Normal resistance Several kohms to several Mohms
Abnormal resistance 0 or

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