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7 Troubleshooting
Problem
Green Power LED is off
Red Protect LED illuminates
No sound
Feedback (whistling)
PTT button does not work
Delegate microphone cannot be
activated, lightring on
microphone arm blinks
Echoes and feedback when
system is connected to a distant
party via AEC/Telco Audio
Interface and external telephone
hybrid or videoconference
codec.
Remedy
• Is the power cable plugged in?
• Is the power switch set to ON (I)?
• Check the main fuse in the power socket.
• Check that the maximum permissible number of
consoles has not been exceeded (60).
• Disconnect all consoles and cables. If the LED still
illuminates, send the power supply unit to an
authorized workshop for repair.
• Activate the test mode.
• Connect the consoles and cables one at a time to
the power supply unit and check their functions.
• Check the volume setting on the chairman console.
• Activate the test mode.
• Check that all Minicon plugs are fully inserted
(locked) into their sockets.
• Move the consoles farther apart.
• Reduce the system volume on the chairman
console.
• Check the operating mode on the chairman's
console. The PTT button works only in manual
mode.
• The maximum number of simultaneously active
microphones has been reached. Increase the limit
or deactivate one of the other microphones.
• Adjust audio levels of the external telephone hybrid
or videoconference codec.
• Check external telephone hybrid or video-
conference codec if acoustic echo cancellation
(AEC) is activated.
• Redial for a possibly better telephone connection.
• Ask connected distant party to check their system
for correct settings.
English
16
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