AT&T MERLIN 820 Installation Manual page 36

TROUBLESHOOTING TABLE (CONTINUED)
Trouble Possible Cause
There is trouble with Faulty voice terminal
voice terminal lights,
speaker, or ringing.
(continued)
Cable connections
A voice terminal Voice terminal T/P
rings constantly. switch is not set in
center position
All voice terminals Control unit is not
have no lights and receiving power
no dial tone.
Do this
2. Unplug the modular voice
terminal cord from the
malfunctioning voice ter-
minal. Replug the cord into a
working voice terminal. Slide
its T/P switch to the T position
and hold it there.
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 each into the
other's jack. See if the trou-
ble occurs on the working
voice terminal.
4. Replace each cable, one at a
time, and test the malfunc-
tioning voice terminal.
Check the position of the T/P
switch.
1. Set the control unit power
switch to Off and then back to
On. This resets the control
unit.
If
the same trouble appears on the the malfunctioning voice terminal
working voice terminal probably is not faulty. The trouble is
in either the control unit or the
cables. Plug the malfunctioning
voice terminal into its original jack
and go to step 3.
the trouble does not appear on the malfunctioning voice terminal is
the working voice terminal faulty. Contact your equipment sup-
plier for assistance.
the trouble still occurs the problem is caused by your con-
trol unit. Call your equipment sup-
plier for assistance.
the trouble no longer occurs the trouble is caused by one of the
cables running to the malfunction-
ing voice terminal. Go to step 4.
the trouble still occurs the replaced cable is not the faulty
one. Replace the next cable.
the trouble no longer occurs you've found the faulty cable.
it is set at either T or P slide it to the center position.
it is in the center position your voice terminal is faulty.
Unplug it from the modular jack
and contact your equipment sup-
plier for assistance.
the green power light on the call your equipment supplier for
control unit is on and the trouble assistance.
remains
the green power light is on and the problem was corrected when
you reset the control unit.
the trouble is gone
the red warning light on the con- go to step 3.
trol unit is on
the green power light is off go to step 2.
Then
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