Troubleshooting - Bosch CCS 900 Ultro Installation And Operating Manual

34 en | Troubleshooting
8

Troubleshooting

Problem
Temporary no
microphone reaction, and
no sound or distorted
sound from unit
loudspeakers.
Acoustic Feedback:
Part of system not
working.
No sound via delegate /
chairman loudspeakers:
Hourglass flashes very
fast:
IOM_CCS900 | V1.0 | 2010.06
Possible cause
Trunk-line overload.
Loudspeaker volume too loud.
Distance between units too
small (microphone to
loudspeaker of other units).
Too close to microphone units,
when using open headphones.
Interrupted trunk-line cabling.
Insertion switch in wrong
position.
Volume control position.
Microphone active or
headphone connected.
The SD card is full.
The SD card is write protected. Remove SD card, and disable
Installation and Operating Manual
CCS 900 Ultro
Solution
Reduce load on the trunk-lines
by reducing the number of units,
and/or the length of the trunk
cables.
Reduce gain using volume
control for Delegate/Chairman
Unit loudspeakers on CU.
If available, switch on Digital
Acoustic Feedback Suppression.
Increase distance between
units.
If available, switch on Digital
Acoustic Feedback Suppression.
Increase the distance between
headphone and microphone or
disconnect headphones when
not in use.
If available, switch on Digital
Acoustic Feedback Suppression.
Check the trunk-line cabling
connections between the units
and the CU, also use the test
function on the CU.
Check if insertion switch at the
rear of the CU is in position "1".
Check if the volume control for
delegate/chairman loudspeakers
on the CU is not in the fully
counter clockwise position.
Notice: units with active
microphone or connected
headphone(s) have their
loudspeakers switched off.
Check SD card, and remove files
if necessary.
Use a PC to format the card. Use
FAT or FAT32. Note: NTFS is
incompatible.
the write protection.
Bosch Security Systems B.V.