AT&T 3.0 manual Telephone Problems

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.

1Replace the telephone (or adjunct) with one that works properly.

2If the problem persists, connect the telephone directly to the control unit, using a cord that works properly.

■If this solves the problem, replace the original cord.

■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.

bIf 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.

3If the problem persists, replace the mounting cord.

4If the problem persists, continue as described below.

Telephone Problems 3–1