Daikin FTXS09DVJU Service Manual page 188

SiUS04-702
5.1.10 Capacitor Voltage Check
Check No.12 Before this checking, be sure to check the main circuit for short-circuit.
5.1.11 Power Transistor Check
Check No.13
Tester's negative terminal
Tester's positive terminal
Normal resistance
Abnormal resistance
Service Diagnosis
Checking the capacitor voltage
With the circuit breaker still on, measure the voltage according to the drawing of the model in
question. Be careful never to touch any live parts.
Fan motor
lead wire
Solenoid valve
lead wire
Checking the power transistor
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
below 50 V using the tester.
For the UVW, make measurements at the Faston terminal on the board or the relay connector.
Power transistor
Use the tester
in the DC range.
UVW
(+)
Power transistor
UVW
(+)
Several kΩ to several MΩ
0 or ∞
Compressor
lead wire
Reactor
lead wire
OL
lead wire
Thermistor
lead wire
(R5473)
Power transistor
UVW
(–)
Power transistor
UVW
(–)
Check
177