Telephone Problems
3
Once you isolate a problem to the telephone (or a group of telephones), you
can run various tests to check a telephone’s operation.
Use the procedure below as a general guideline for troubleshooting
telephones.
1 Replace the telephone (or adjunct) with one that works properly.
2 If the problem persists, connect the telephone directly to the control unit,
using a cord that works properly.
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If this solves the problem, replace the original cord.
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The power supply may be shorted or open. If the wiring has been
crushed or severed, replace it.
a Test the power supply for 48 VDC with a voltmeter or by
reconnecting the telephone or adjunct.
b If the test for 48 VDC fails, replace the circuit pack in the
telephone or adjunct.
CAUTION:
A faulty circuit pack has the potential to damage the power supply,
which can cause widespread damage throughout the system.
3 If the problem persists, replace the mounting cord.
4 If the problem persists, continue as described below.
Telephone Problems 3–1
