Bosch DCN Next Generation Installation & User's Instructions page 275

DCN Next Generation | Installation and User Instructions | Troubleshooting
Problem
The audio signals on the audio
outputs of a (digital) audio
expanders contains noise.
The display of an optical network
device shows No Network.
The audio inputs of an optical
network device do not give an audio
signal.
A pluggable microphone does not
operate correctly.
A discussion unit does not operate
correctly.
A flush-mounted device does not
operate correctly.
A data distribution board does not
operate correctly.
During downloading, the message
"download failed" occurs.
Languages displayed on the
Concentus units do not match with
the languages set in the PC.
Noise can be heard in the system.
The system does not operate
correctly, but you do not know what
the problem is.
You cannot start the network
controller.
A multi CCU system does not
operate correctly, but you cannot
tell what the problem is.
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Hint
• The optical network cable that is connected to the (digital) audio
expander is too long (refer to section 2.6).
• The optical network cable that is connected to the optical network
device is too long (refer to section 2.6).
• Make sure that the audio input is enabled with the control inputs (for
example, refer to section 11.4.5).
• The optical network does not contain more than 16 devices (refer to
section 2.3).
• The pluggable microphone is defective. Replace the pluggable
microphone.
• The discussion unit is not in the correct mode. Refer to section 14.4 for
instructions that tell you how to change the mode of the discussion unit.
• The dual delegate interface of the flush-mounted device is not in the
correct mode. Refer to section 21.4 for instructions that tell you how to
change the mode of the dual delegate interface.
• The data distribution board is not in the correct mode. Refer to section
47.3.3 for instructions that tell you how to change the mode of the data
distribution board.
• Follow the instructions for downloading (refer to section 8.7 and 10.6).
• Follow the instructions for downloading (refer to section 8.7 and 10.6).
• Earth the system at one point only (refer to section 8.3.6 and 10.3.2).
• An 'open-ended' DCN cable without a cable termination plug can cause
the problem (refer to section 1.7.4). Connect cable termination plugs to
all 'open-ended' DCN cables.
• A transmitter which was connected while being switched on can cause
the problem. Switch the transmitter off and on.
• The network controller is not connected to a mains power supply (refer
to section 10.6.1).
• Check whether each sub system operates correctly in single CCU
mode (refer to section 8. 1 0. 1 1).
• A CCU or transmitter which was connected while being switched on
can cause the problem. If the problem persists: switch off and on one by
one the transmitter(s) and CCU(s) (refer to section 8.5.3 and 10.6.3).
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