AT&T Merlin II Installation And Maintenance Manual page 372

LIGHTS, SPEAKER,
RINGING PROBLEMS
Possible Cause
1. A faulty control unit or
Power Supply Module.
Symptom: There is trouble with voice terminal lights,
speaker, and/or ringing.
Possible Solution
Analog set: Slide the T/P
switch on the left side of the
voice terminal the T
to
position and hold it there if
necessary. If all the red and
green lights flash alternately
and a tone sounds
continually, the analog set is
working properly.
Digital set with data stand:
Turn the voice terminal over
and press the recessed Self-
Test button on the data stand
with a pointed object such as
a straightened paper clip. If
the lights come on but do not
flash. The digital set is
working properly.
If some (but not all) of the
lights flash continually
and/or a tone sounds at
irregular intervals, the
trouble is caused by the voice
terminal or the cable
connection.
If all lights are off and a tone
sounds continually or
irregularly the trouble is
caused by the control unit,
the voice terminal, or the
cable connection.
(continued)
Procedures for Specific Symptoms
To Investigate Further
G to Possible Cause 3.
O
Go to Possible Cause 3.
Go to Possible Cause 2.
Go to Possible Case 2.
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