Daikin FTKS20D3VMW, Service Manual, Page: 294 / 355

SiENBE12-713 Check
Service Diagnosis 283
6.1.11 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
question. Be careful never to touch any live parts.
6.1.12 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 below 50 V using the tester.
!
For the UVW, make measurements at the Faston terminal on the board or the relay
connector.
THERMISTOR LEAD WIRE
(GAS PIPE)
THERMISTOR LEAD WIRE
(LIQUID PIPE)
REVERSING SOLENOID
VALVE LEAD WIRE
MULTIMETER
(DC. VOLTAGE RANGE)
REACTOR LEAD WIRE COMPRESSOR LEAD WIRE
OL LEAD WIRE
THERMISTOR LEAD WIRE
FAN MOTOR LEAD WIRE
ELECTRONIC EXPANSION VALVE
COIL LEAD WIRE(ROOM-A) ELECTRONIC EXPANSION VALVE COIL
LEAD WIRE(ROOM-B)
ELECTRONIC EXPANSION VALVE
COIL LEAD WIRE(ROOM-C)
(R5154)
Tester's negative terminal
Power transistor
(+)
UVW
Power transistor
(–)
UVW
Tester's positive terminal UVW
Power transistor
(+)
UVW
Power transistor
(–)
Normal resistance Several kohms to several Mohms
Abnormal resistance 0 or
∞