No Audio; Table 4-4: No Audio Checklist - PictureTel Concorde 4500 Servicing Manual

No Audio

If you have these
symptoms...
No system sound.
A video image is displayed
on the monitor.
The far end cannot hear you.
The following table summarizes the corrective actions that you can
follow if you have no audio.

Table 4-4: No Audio Checklist

1. If the far-end keypad is a wired keypad, make sure that the
INT MIC switch on the back side of the keypad is set to ON .
2. Make sure all microphone inputs at the far end are
connected.
3. Check to see if the far end is muted.
4. Press the volume up/down button on the keypad.
5. Check the monitor volume.
6. Make sure that the Bose
connected to the electronics module. (This includes the
audio input and the power cable.)
7. Isolate the problem by performing a local channel loopback
test or a video-audio loopback test at both sites.
If no audio is heard at one of the sites the problem is at
that site.
8. Perform the Video-Audio Test Pattern at the failing site.
If you do not hear the tone, you may have a defective Audio
board. If you do hear the tone, you may have a defective
microphone.
1. Check to be sure that the PowerMic and any additional
microphones are plugged in and enabled.
The PowerMic may be enabled and plugged in but the
additional microphones may be disabled.
2. Check to see that you are not muted.
3. Check to see if the far end is muted.
Basic Troubleshooting Procedures
Do this...
®
speaker cables are securely
4-11