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7
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Green Power LED is off
• Is the power cable plugged in?
• Is the power switch set to ON (I)?
• Check the main fuse in the power socket.
Red Protect LED illuminates
• 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.
No sound
• Check the volume setting on the chairman console.
• Activate the test mode.
• Check that all Minicon plugs are fully inserted
(locked) into their sockets.
Feedback (whistling)
7 Troubleshooting
Problem
Remedy
• Move the consoles farther apart.
• Reduce the system volume on the chairman
console.
PTT button does not work
• Check the operating mode on the chairman's
console. The PTT button works only in manual
mode.
Delegate microphone cannot be
activated, lightring on
microphone arm blinks
• The maximum number of simultaneously active
microphones has been reached. Increase the limit
or deactivate one of the other microphones.
Echoes and feedback when
system is connected to a distant
party via AEC/Telco Audio
Interface and external telephone
hybrid or videoconference
codec.
• 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.