Capacitor Voltage Check; Power Transistor Check - Daikin F-Series Service Manual

Check

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
160
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.
Multimeter
(DC voltage range)
Compressor lead wire
Fan motor lead wire
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.
Power transistor
Reactor lead wire
Electronic expansion valve
lead wire
UVW
(+)
Power transistor
UVW
(+)
Several kΩ to several MΩ
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
Service Diagnosis
SiBE04-705
UVW
(–)
(R5237)