Daikin FTX50GV1B - Capacitor Voltage Check; Power Module Check

SiBE041029EC Check
Service Diagnosis 102
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.
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To prevent an electrical shock, use a multimeter to check that the voltage between P (+) and
N (–) is 50 V or less.
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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.
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.
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Disconnect the compressor harness connector from the outdoor unit PCB. To disengage the
connector, press the protrusion on the connector.
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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.
Multimeter
(DC voltage range)
(R18183)
N(–) P(+)
Coating
PCB
Multimeter probe
(R17868)
Positive terminal (+) of
digital multimeter
Power module
(+)
UVW Power module
(–)
UVW
Negative terminal (–) of
digital multimeter
UVW Power module
(+)
UVW Power module
(–)
Resistance is OK. several kΩ ~ several MΩ
Resistance is NG. 0 Ω or ∞