Power Module Check - Daikin 4MXL-T Series Service Manual

SiUS121827E

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.
 Disconnect the compressor harness connector from the outdoor unit PCB. To disengage the
 Follow the procedure below to measure resistance between the (+) or (–) terminal of the power
Positive terminal (+) of
digital multimeter
Negative terminal (–) of
digital multimeter
Resistance is OK.
Resistance is NG.
Part 6 Service Diagnosis
connector, press the protrusion on the connector.
module and the U, V, or W terminal of the compressor with a multimeter. Evaluate the
measurement results referring to the following table.
Power module
UVW
(+)
Power module
UVW
(+)
several kΩ ~ several MΩ
0 Ω or ∞
Power module
UVW
(–)
Power module
UVW
(–)
DC–
W
V
U
DC+
Check
R6000526
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