Capacitor Voltage Check; Power Transistor Check - Daikin FTXS30HVJU Service Manual

SiUS04-924

5.1.10 Capacitor Voltage Check

Check No.12 Before this checking, be sure to check the main circuit for short-circuit.
 Checking the capacitor voltage
 With the circuit breaker still on, measure the voltage according to the drawing of the model in

5.1.11 Power Transistor Check

Check No.13
 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
 For the UVW, make measurements at the Faston terminal on the board or the relay connector.
Tester's negative terminal Power transistor
Tester's positive terminal
Normal resistance
Abnormal resistance
Service Diagnosis
question. Be careful never to touch any live parts.
Multimeter
(DC voltage range)
Compressor lead wire
below 50 V using the tester.
Reactor lead wire
Electronic expansion valve
Fan motor lead wire
lead wire
UVW
(+)
Power transistor
UVW
(+)
Several k to several M
W V
OL lead wire
Thermistor lead wire
Reversing solenoid
valve lead wire
(Heat pump type only)
(R5222)
Power transistor
(–)
Power transistor
UVW
0 or 
U
(R9747)
Check
UVW
(–)
111