Troubleshooting
SiBE04-101
118
Service Diagnosis
Troubleshooting
Check No.12
Refer to P.121
Is the grounding proper?
Is there any disturbance?
Is it normal?
NO
YES
NO
NO
NO
YES
Turn off the power,
remove No. 2 of the terminal board,
and turn the power on again.
Check the grounding.
Turn the power off and back on
again.
Does
the same LED indication
appear again?
YES
NO
YES
YES
∗
Check the voltage at the terminals
marked with "5V" and "GND".
Replace the fuse.
Replace the outdoor unit PCB.
Provide the grounding.
The malfunction may be caused by an
external factor, rather than defective
parts.
Locate the cause of the noise, etc.,
and correct the situation.
Locate the cause of the power supply
waveform disturbance, and take
necessary measures.
Replace the outdoor unit PCB.
Correct interconnecting wire.
Replace the indoor unit PCB.
Correct the power supply.
Replace the outdoor unit PCB.
Replace the varistor.
(R1071)
Check No. 12
Power supply waveform check
YES
∗
after 10 seconds.
NO
Check the 5-VDC power supply of
the outdoor unit PCB.
Is the voltage 5 ± 0.5 V?
Is LED-A
blinking more than 10 times?
Check the interconnecting wire
between indoor and outdoor unit.
Check the varistor on outdoor unit
PCB.
Check the fuse on outdoor unit
PCB.
Is the varistor damaged?
Check 25 Amps fuse on outdoor
unit PCB.
Is there conductivity in
25 Amps fuse
Is the fuse damaged?
Check the power supply voltage.
YES
YES
NO
NO
NO
NO
YES
YES
Is it at the rated voltage?
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
SiBE04-101.book Page 118 Monday, October 15, 2001 3:08 PM
