SiBE07-618_C
Check
Service Diagnosis
99
5.1.9 Capacitor Voltage Check
Check No.12
Before this check, be sure to check the main circuit for short circuit.
With the circuit breaker still on, measure the voltage according to the drawing of the model in
question. Be careful never to touch any live parts.
5.1.10 Power Module Check
Check No.13
Note:
Check to make sure that the voltage between (+) and (–) of the diode bridge (DB1) is approx.
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 terminals of the DB1 and
the terminals of the compressor with a multi-tester. Evaluate the measurement results for a
judgment.
OL lead wire
Thermistor lead wire
Fan motor lead wire
Compressor lead wire
Reactor lead wire
Four way valve
lead wire
Electronic expansion valve
lead wire
Multimeter
(DC voltage range)
(R5222)
Negative (–) terminal of
tester (positive terminal
(+) for digital tester)
DB1 (+)
UVW
DB1 (–)
UVW
Positive (+) terminal of
tester (negative terminal
(–) for digital tester)
UVW
DB1 (+)
UVW
DB1 (–)
Resistance in OK
several k
Ω
~ several M
Ω
Resistance in NG
0
Ω
or
∞
W
V
U
(R5237)
