Daikin SkyAir RZR-P Series Service Manual page 183

SiUS281117
CHECK 4
Check for Power Transistor
Judgement is made through cable check with an analog tester.
(1) Do not touch the energized part (high voltage part) for at least 10 minutes after the power is
(2) Be sure to touch the ground terminal with a hand to release static electricity from the body
(3) Also with a tester, take measurements at the following spots and confirm that residual
(4) After checking the residual electric charge, remove the connector of the outdoor unit fan
(5) Remove the wire connecting the power transistor and the compressor. Remove it from the
(6) Using an analog tester, measure resistance and fill in the blanks in the following table.
176
turned OFF.
(to prevent PCB from being damaged).
electric charge of the power transistor is DC 50V or less.
Electrical
equipment box
Outdoor unit
fan connector
Front face Ground terminal
motor. When the outdoor unit fan is rotated by strong headwind, remove the connector of the
outdoor unit fan motor after confirming that the outdoor unit fan has stopped because
electrical energy is stored in the capacitor and there may be a risk of electric shock.
compressor terminal side.
During this work, be careful not to deform Faston terminal at the end of the relay wire.
In case of unbalanced resistance for one of the 3 phases in each table (when the resistance
value is equal to 5 times or more than the other resistance values), the power transistor is
broken.
In normal cases, each phase shows a similar resistance value.
Outdoor Unit
PCB
C+ C-
U V W
Red White Blue
U V W
Comp.
M1C
Troubleshooting by Remote Controller
Tester Resistance

(+) (-)
C+ U
C+ V
C+ W

U C+

V C+

W C+
Residual voltage
measurement spot
Tester Resistance

(+) (-)

C- U

C- V

C- W
U C-
V C-
W C-
Service Diagnosis