Installation guide

TROUBLE ON ONE TELEPHONE
Lights
4.
Control unit is defective.
4.
Make sure all cords are labeled before
unplugging them from the control unit.
Unplug the voice terminal extension cord or
jumper cord from the control unit. Plug the
cord into a different Voice Terminals jack on
the control unit. See if the voice terminal
operates normally in the test mode. If it does,
the control unit probably will require repair.
NOTE: If the system is a Model 820, plug the
voice terminal extension cord or jumper cord
into a different Voice Terminal Module. If the
voice terminal operates normally in the test
mode, replace the Voice Terminal Module.
A4-4