AT&T MERLIN 820 Installation Manual page 25

If the tone does not sound:
Do This
the tone sounds
Use the voice ter-
minal's volume control
switch to turn up the
volume.
the tone still doesn't
sound
4
Slide the T/P switch to the center position.
The lights stop flashing and the tone stops.
24
Then
If
you've solved the
problem.
make a note of it, and
refer to the
Troubleshooting Table,
page 33, after you've
completed the
installation.
Check the circled wiring
connections if the lights
do not flash.