AT&T MERLIN 410 Installation Manual page 29

TROUBLESHOOTING TABLE (CONTINUED)
Possible Cause
Trouble
Control unit
There is trouble with
voice terminal lights,
speaker, or ringing.
(continued)
Cord connections
Inadequate power
supply to the control
unit
Voice terminal T/P
A voice terminal
switch is not set in
rings constantly.
center position
Control unit
All voice terminals
have no lights and
no dial tone.
28
Do this
3. Go to the control unit and
locate the intercom jacks for
both the malfunctioning and
working voice terminals.
Unplug both from the control
unit, and replug both into the
other's jack. See if the trou-
ble occurs on the working
voice terminal.
4. Replace each cord, one at a
time, and test the malfunc-
tioning voice terminal.
5.
Unplug some of the ac-
cessories connected to your
system.
Check the position of the T/P
switch.
1. Check the green power light
on the control unit.
2.
Check the red warning light
on the control unit.
If
the problem is caused by your con-
the trouble still occurs
trol unit. Call your equipment sup-
plier for assistance.
the trouble is caused by one of the
the trouble no longer occurs
cords running to the malfunctioning
voice terminal. Go to step 4.
the cause is inadequate power to
the trouble still occurs
the control unit Go to step 5.
you've found the faulty cord.
the trouble no longer occurs
the problem is caused by your con-
the trouble remains
trol unit or the building wiring. Call
your equipment supplier for
assistance.
you need one or more Voice Ter-
the trouble no longer occurs
minal Power Supply units. Refer to
"Installing Accessories," page 19.
Call your equipment supplier. Leave
accessories unplugged until you
have the necessary power.
slide it to the center position.
it is set at either T or P
your voice terminal is faulty.
it is in the center position
Unplug it from the modular jack
and contact your equipment sup-
plier for assistance.
go to step 2.
the green power light is on
go to step 4.
the green power light is off
go to step 3.
the red warning light is off
go to step 4.
the red warning light is on
Then