Power Transistor Check - Daikin D-Series Service Manual

SiBE12-522
6.1.11 Capacitor Voltage Check
Check No.12 Before this checking, be sure to check the main circuit for short-circuit.
6.1.12

Power Transistor Check

Check No.13
Tester's negative terminal Power transistor
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
coil lead wire
(Room A)
Solenoid valve
coil lead wire
(Room B)
Solenoid valve
coil lead wire
(Room C)
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 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.
Use the tester
in the DC range.
Thermistor Thermistor
lead wire lead wire
(liquid pipe) (gas pipe)
UVW
(+)
Power transistor
UVW
(+)
Several kohms to several Mohms
Compressor
lead wire
Reactor
lead wire
OL
lead wire
Thermistor
lead wire
(Q0366)
Power transistor
(–)
Power transistor
UVW
0 or ∞
Check
UVW
(–)
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