Daikin RZQ100B8V3B Service Manual page 262

Additional Checks for Troubleshooting
5.9.4 Outdoor unit: Check for Power Transistor
1
3 3
Power transistor
(on inverter PC
board)
4
5
3–114
Judgment according to the continuity check by using an analog tester:
(1) Do not touch the charged area (high voltage) for 10 minutes after turning the power supply off.
(2) If you must touch such an area, make sure that the power supply voltage of power transistor is 50
V or less.
(3) Before measuring the continuity, disconnect the connection between compressor and power
transistor.
(4) Measure the continuity in the following procedure.
[Judgment] Normal if the continuity check results in the following.
P — U
P — V
P — W
U — P
V — P
W — P
*
If there is continuity, the resistance should be the same as each phase.
* If a digital tester is used for the measurement of continuity, ∞ and continuity may be reversed.
Continuity U — P
Continuity V — P
*
Continuity W — P
∞
P — U
∞
P — V
∞
P — W
∞
∞
∞
Continuity
Continuity
*
Continuity
(S2678)
Part 3 – Troubleshooting
ESIE05-03