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

SiBE061121.book Page 128 Monday, April 25, 2011 3:21 PM
Check

5.13 Capacitor Voltage Check

Check No.21 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.

5.14 Power Module Check

Check No.22
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.
128
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
(R13538)
UVW DB1 (–)
DB1 (+) UVW
several kΩ ~ several MΩ
0 Ω or ∞
Service Diagnosis
SiBE061121
UVW
DB1 (–)