Power Module Check - Daikin FTXZ25NV1B Service Manual

SiMT041311E

3.14 Power Module Check

Check No.22
Note: Check to make sure that the voltage between (+) and (–) of the diode bridge (DB1) 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
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
diode bridge, and the U, V, or W terminal of the compressor with a multimeter. Evaluate the
measurement results referring to the following table.
bridge (+)
Diode
UVW
bridge (–)
UVW Diode
bridge (+)
Diode UVW
several kΩ ~ several MΩ
0 Ω or ∞
UVW
bridge (–)
Diode
Diode bridge
(R19736)
Check
190