5-4
5.6.5 Sound Failures
Symptoms Possible Cause Troubleshooting
No hardkey
or knob
sound, or
hardkey or
knob sound
abnormal
The key volume is set
to 0.
Select [Main
→
][General Setup >>] to adjust the key
volume.
Cable defective
Check that the cable between the speaker and
interface board is properly connected.
Speaker defective Replace the speaker.
The main board failed. Replace the main board.
Power management
board defective
Replace the power management board.
No alarm
sound or
alarm sound
abnormal
The alarm volume is
set to 0.
Select [Main
→
][Maintenance >>
→
]]User
Settings >>
→
] enter the required
→
password [Ok
→
][Alarm Setup >>] and set the
[Minimum Alarm Volume] to a proper level in the
prompt menu. Select [Main
→
][General Setup >>] to
adjust the key volume.
Cable defective
1. Check that the cable between the speaker and
interface board is properly connected.
Speaker defective Replace the speaker.
The main board failed. Replace the main board.
Power management
board defective
Replace the power management board.
5.6.6 Battery Failures
Symptoms Possible Cause Troubleshooting
Battery cannot
be charged
Battery defective Replace the battery.
Cable defective
Check that the cable between the battery interface
board and power management board is correctly
connected.
Power management
board defective
Replace the power management board.
Battery interface
board defective
Replace the battery interface board.
NOTE
When the battery module has a failure, it may cause problems to other components.
In this case, troubleshoot the battery module per the procedure described in the
table above.
Components of the main unit are powered by the power module. In the event that a
component malfunctions, check if the operating voltage is correct.
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