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

SiBE041029EB

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
Note: Check to make sure that the voltage between (+) and (–) of the power module or the diode
bridge is approximately 0 V before checking.
Negative (–) terminal of multimeter
(positive terminal (+) for digital
multimeter)
Positive (+) terminal of multimeter
(negative terminal (–) for digital
multimeter)
Resistance is OK.
Resistance is NG.
Service Diagnosis
Multimeter
(DC voltage range)
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 (+) or (–) terminal of the
power module or the diode bridge, and the U, V, or W terminal of the compressor with a
multimeter. Evaluate the measurement results referring to the following table.
Power module (+)
or
bridge (+)
Diode
UVW
UVW Power module
Diode
Power module (+) UVW
or
bridge (+)
Diode
several kΩ ~ several MΩ
0 Ω or ∞
(R18183)
(–)
UVW
or
bridge (–)
Power module
or
bridge (–)
Diode
Check
(–)
100