Lucent Technologies MERLIN LEGEND Release 5.0 Maintenance And Troubleshooting Manual page 223

MERLIN LEGEND Communications System Release 5.0
Maintenance and Troubleshooting 555-650-140
Control Unit Problems
Carrier Problems
Removing the Faulty Carrier
Remove the control unit housing.

If you need instructions, see
Chapter
Back up system programming.

If you need instructions, see System Programming and Maintenance
(SPM) (for disk backups) or
Card''.
Power down the system by turning off the components listed below,

in the order given.
a. Power supply on the basic carrier
b. Power supply on each expansion carrier
c. Auxiliary power units (if present)
Unplug the control unit from the AC outlet.

Remove the processor, the power supply, and all other modules

from the faulty carrier. (If you prefer to remove the cords first, make
sure they are labeled.)
Put the modules aside, in order, so that you can reinstall them later

in the replacement carrier.
Remove all modules from the carriers to the right of the faulty

carrier.
Starting with the rightmost carrier, loosen the four screws that

secure the four corners of the carrier to the backboard.
Slide the carrier to the right until the connector disengages from the

carrier to the left.
Pull the carrier away from the wall so that the screws slip through

the large screw holes.
1.
''Removing the Control Unit Housing''
Appendix D, ''Backing Up with a Memory
Issue 1
June 1997
Page 4-133
in