SiMT041311E
Check
Service Diagnosis
190
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.
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.
Negative (–) terminal of multimeter
(positive terminal (+) for digital
multimeter)
Diode
bridge (+)
UVW
Diode
bridge (–)
UVW
Positive (+) terminal of multimeter
(negative terminal (–) for digital
multimeter)
UVW
Diode
bridge (+)
UVW
Diode
bridge (–)
Resistance is OK.
several k
Ω
~ several M
Ω
Resistance is NG.
0
Ω
or
∞
(R19736)
Diode bridge