Power Module Check - Daikin BA-Series Service Manual

Check

5.13 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.
RK(X)S25/35E2V1B
109
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
Diode bridge
UVW Power module
Diode
Power module (+) UVW
or
bridge (+)
Diode
several kΩ ~ several MΩ
0 Ω or ∞
SiBE05-722ED
(–)
UVW
or
bridge (–)
Power module
or
bridge (–)
Diode
(R19945)
Service Diagnosis
(–)