Technical data

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