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Possible Cause
Possible Solution
To Investigate Further
1. A faulty control unit or
If the lights are dim when Contact the equipment
Power Supply Module
testing an analog set look for
supplier for assistance.
(Continued).
a faulty control unit or Power
Supply Module. You may
need an auxiliary power
supply.
If the lights are dim when
testing a digital set with a
data stand, the trouble is its
power supply.
2. A faulty voice terminal.
Use these steps to try to
correct the problem:
1 Unplug the modular
voice terminal cord from
the malfunctioning voice
terminal.
2 Plug the cord into a
working voice terminal
of the same type (either
analog or digital).
3 On an analog set slide
its T/P switch to the T
position and hold it there
if necessary.
or
On a digital set with a
data stand, turn the unit
over and press the
recessed Self-Test button
with a pointed object
such as a straightened
paper clip.
(Continued)
4-42 Procedures for Specific Symptoms