Power Transistor Check - Daikin Altherma EKHBH Series Service Manual

ESIE06-03
5.12

Power Transistor Check

Check No.13
Tester's negative terminal
Tester's positive terminal
Normal resistance
Abnormal resistance
Part 3 – Troubleshooting
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 board or the relay connector.
Additional Checks for Troubleshooting
Power UVW
transistor (+)
UVW Power
transistor (+)
Several kΩ to several MΩ
W
Power UVW
transistor (–)
UVW Power
transistor (–)
0 or ∞
V U
1
3 3
4
5
3–61