Power Module Check - Daikin 4MXS-R Series Service Manual

Check

8.15 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.
219
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 and the U, V or W terminal of the compressor with a multimeter. Evaluate the
measurement results referring to the following table.
DC–
DC+
U
Power module UVW
(+)
UVW Power module
(+)
several kΩ ~ several MΩ
V W
SiUS121736EA
Power module
(–)
UVW Power module
0 Ω or ∞
(R24593)
Service Diagnosis
UVW
(–)