Capacitor Voltage Check; Power Module Check - Daikin SiBE07-618_D Service Manual Field

Check

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.
Negative (–) terminal of
tester (positive terminal
(+) for digital tester)
Positive (+) terminal of
tester (negative terminal
(–) for digital tester)
Resistance in OK
Resistance in NG
98
Multimeter
(DC voltage range)
Compressor lead wire
Fan motor lead wire
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.
Reactor lead wire
Electronic expansion valve
lead wire
DB1 (+) UVW
UVW DB1 (+)
several kΩ ~ several MΩ
W V U
SiBE07-618_D
OL lead wire
Thermistor lead wire
Four way valve
lead wire
(R5222)
DB1 (–)
UVW DB1 (–)
0 Ω or ∞
(R5237)
Service Diagnosis
UVW