Capacitor Voltage Check; Power Module Check - Daikin FTX50GV1B Service Manual

SiBE041029EC

5.13 Capacitor Voltage Check

Check No.21 RX50/60G2V1B, 71 class only
Before this check, be sure to check the main circuit for short circuit.
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.

5.14 Power Module Check

Check No.22 Check to make sure that the voltage between (+) and (–) of the power module is about 0 V
before checking.
Positive terminal (+) of
digital multimeter
Negative terminal (–) of
digital multimeter
Resistance is OK.
Resistance is NG.
Service Diagnosis
Multimeter
(DC voltage range)
To prevent an electrical shock, use a multimeter to check that the voltage between P (+) and
N (–) is 50 V or less.
The surface of the test points (P, N) may be covered with the coating. Be sure to make firm
contact between the multimeter probes and the test points.
Multimeter probe
Disconnect the compressor harness connector from the outdoor unit PCB. To disengage the
connector, press the protrusion on the connector.
Follow the procedure below to measure resistance between the terminals of the power
module and the terminals of the compressor with a multimeter. Evaluate the measurement
results referring to the following table.
Power module
N(–) P(+)
UVW
(+)
UVW Power module
(+)
several kΩ ~ several MΩ
(R18183)
Coating
PCB
(R17868)
Power module
(–)
UVW Power module
0 Ω or ∞
Check
UVW
(–)
102