Capacitor Voltage Check; Power Transistor Check - Daikin CTXS09GVJU Service Manual

SiUS12-814

6.1.10 Capacitor Voltage Check

Check No.12
Before checking the capacitor voltage, be sure to check the main circuit for short-circuit.
18 class
32 class

6.1.11 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.
MULTIMETER
(DC. VOLTAGE RANGE)
FAN MOTOR LEAD WIRE
MULTIMETER
(DC. VOLTAGE RANGE)
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
COMPRESSOR LEAD WIRE REACTOR LEAD WIRE
(ROOM-A) (ROOM-B) (ROOM-C)
ELECTRONIC EXPANSION VALVE COIL LEAD WIRE
REACTOR LEAD WIRE COMPRESSOR LEAD WIRE
(ROOM-A) (ROOM-B) (ROOM-C)
ELECTRONIC EXPANSION VALVE COIL LEAD WIRE
UVW
(+)
Power transistor
UVW
(+)
Several kohms to several Mohms
0 or ∞
OL LEAD WIRE
THERMISTOR LEAD WIRE
THERMISTOR LEAD WIRE
(GAS PIPE)
THERMISTOR LEAD WIRE
(LIQUID PIPE)
(ROOM-D)
(R6335)
OL LEAD WIRE
THERMISTOR LEAD WIRE
THERMISTOR LEAD WIRE
(GAS PIPE)
THERMISTOR LEAD WIRE
(LIQUID PIPE)
REVERSING SOLENOID
VALVE LEAD WIRE
(ROOM-D)
(R6334)
Power transistor
UVW
(–)
Power transistor
UVW
(–)
Check
165