Lucent Technologies MERLIN LEGEND Release 5.0 Maintenance And Troubleshooting Manual page 98

MERLIN LEGEND Communications System Release 5.0
Maintenance and Troubleshooting 555-650-140
Control Unit Problems
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
throughout this procedure.
Make sure the switch on the power supply module is turned off.

Unplug the power supply and the auxiliary power unit from the AC

outlet.
Disconnect the cord from the AUX POWER INPUT jack on the power

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

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

Plug the power unit line cord into the J2 DC OUTPUT jack on the

replacement auxiliary power unit.
Plug the other end of the power unit line cord into the AUX POWER

INPUT jack on the power supply.
Issue 1
June 1997
Page 4-8
Figure 4-3