Capacitor Voltage Check; Power Module Check - Daikin J Series Service Manual

SiBE041101

5.10 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.

5.11 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
Service Diagnosis
Multimeter
(DC voltage range)
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.
DB1 (+) UVW
UVW DB1 (+)
several kΩ ~ several MΩ
(R13538)
DB1 (–)
UVW DB1 (–)
0 Ω or ∞
Check
UVW
128