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

Check

5.12 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.

5.13 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.
 Disconnect the compressor harness connector from the outdoor unit PCB. To disengage the
 Follow the procedure below to measure resistance between the terminals of the DB1 and the
Negative (–) terminal of
tester (positive terminal
(+) for digital tester)
Positive (+) terminal of
tester (negative terminal
(–) for digital tester)
Resistance is OK
Resistance is NG
Service Diagnosis
Multimeter
(DC voltage range)
connector, press the protrusion on the connector.
terminals of the compressor with a multi-tester. Evaluate the measurement results for a
judgment.
DB1 (+) UVW
UVW DB1 (+)
several k ~ several M
(R13538)
DB1 (–)
UVW DB1 (–)
0  or 
SiUS04-924_A
UVW
119