Telos ZephyrExpress - page 149

TROUBLESHOOTING 9-7
Block diagram of the audio circuitry during Far Loopback
In Far Loopback, you should be able to:
1. Route the mic to one or both send circuits;
2. Shout into the mic, and see the A or B routing LED turn red to indicate overload1;
3. Turn off the Monitor 2 SEND switch, set its RECEIVE switch to AB, raise the level, and
hear the microphone in a headphone plugged into the front panel.
If these tests fail, and you’re sure the Audio menu settings are correct, the problem is ei-
ther with the mic and headset and their wiring or with ZephyrExpress’ internal audio
circuits. You may be able to broadcast using the alternate mic input or the line input, until
you can get it fixed. You may be able to receive signals using the direct RECEIVE output on
the rear panel.
iISDN TIP!
If you’re in Far Loopback and an ISDN line is connected and properly configured,
ZephyrExpress will answer any incoming calls and send the data directly back to
the caller. This is handy for testing the data path and the distant studio’s codec,
as explained on page 9-9.
1 If it doesn’t turn red, raise the Sensitivity in that mic’s submenu.