AT&T 3.0 manual Replacing Auxiliary Power Units

Power Supply Problems

Replacing Auxiliary Power Units

Follow this procedure if any of the following symptoms occur:

■The LEDs on the multiline telephones that are connected to the last two modules in the carrier do not light.

■The last two slots in the carrier do not have power.

■The power supply LED is off.

To replace the auxiliary power unit, follow the steps below. Refer to Figure 4-3throughout this procedure.

1 Make sure the switch on the power supply module is turned off.

2Unplug the power supply and the auxiliary power unit from the AC outlet.

3Disconnect the cord from the AUX POWER INPUT jack on the power supply module.

4Remove the auxiliary power unit (with the two cords still attached).

5Mount the replacement auxiliary power unit in place of the old one.

6Plug the power unit line cord into the J2 DC OUTPUT jack on the replacement auxiliary power unit.

7Plug the other end of the power unit line cord into the AUX POWER INPUT jack on the power supply.

4-8Control Unit Problems