Si20-701_B Troubleshooting by Remote Controller
468
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 turned OFF.
(2) Be sure to touch the earth terminal with a hand to
release static electricity from the body (to prevent
PCB from being damaged).
(3) Also with a tester, take measurements at the following
spots and confirm that residual electric charge of the
power transistor is DC 50V or less.
(4) After checking the residual electric charge, remove
the connector of the outdoor unit fan 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.
(5) Remove the wire connecting the power transistor and
the compressor. Remove it from the compressor
terminal side.
During this work, be careful not to deform. Faston
terminal at the end of the relay wire.
CHECK 6
Front face
Earth terminal
Residual voltage
measurement spot
Electrical
equipment box
Outdoor unit
fan connector
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