Lucent Technologies MERLIN LEGEND Release 5.0 Maintenance And Troubleshooting Manual page 100

MERLIN LEGEND Communications System Release 5.0
Maintenance and Troubleshooting 555-650-140
Control Unit Problems
Power Supply Problems
Replacing the Power Supply
!
WARNING:
Beware of hazardous voltages; whenever the carrier connections
are exposed, use extreme caution; do not touch them directly or
with any type of tool. Follow all procedures carefully.
To remove the power supply module, follow the steps below.
If possible, back up system programming on a memory card

(Release 3.0 or later only) or floppy disk.
See System Programming and Maintenance (SPM) for information about
backing up to a floppy. For information about backing up to a PCMCIA
memory card, see
basic carrier's power supply fails, you cannot back up system
programming.
Power down the system.

a. Turn off the power supply in the basic carrier.
b. Turn off the power supply in each expansion carrier.
c. Unplug the auxiliary power unit, if present, from the AC outlet.
Unplug the system from the AC outlet.

Remove the power supply.

a. Unplug the AC power cord from the power supply.
b. Remove the ground wire attached to the grounding screw on the
c. Remove the two ferrite cores, if present, from around the AC
d. Remove the power supply module.
Appendix D, ''Backing Up with a Memory
front of the power supply module.
power cord and ground wire.
Issue 1
June 1997
Page 4-10
Card''. If the