Lucent Technologies MERLIN LEGEND Release 5.0 Maintenance And Troubleshooting Manual page 121

MERLIN LEGEND Communications System Release 5.0
Maintenance and Troubleshooting 555-650-140
Control Unit Problems
Processor Problems
Replacing the Processor Module
A failed processor module must be replaced immediately.
To replace the processor module, follow the steps below.
If possible, save system programming.

See Appendix D, ''Backing Up with a Memory
floppy disk, see System Programming and Maintenance (SPM) .
Power down the system.

a. Turn off the power supply on the basic carrier.
b. Turn off the power supply on each expansion carrier.
c. Unplug the auxiliary power units (if present) from the AC outlet.
Unplug the D8W cord(s) connecting the SMDR printer and/or

system programming PC.
Remove the processor module.

Inspect the processor module for any visible problems.

Inspect the carrier.

For Release 3.0 and later, skip to Step 8. For Release 2.1 and earlier,

install a feature module in the new processor.
Use the feature module from the old processor if it appears to be
functioning correctly; otherwise, install a new feature module. See
''Replacing the Feature Module''
Install the new processor module.

Power up the system.

a. Plug the auxiliary units (if present) into the AC outlet.
b. Turn on the power supply on each expansion carrier.
c. Turn on the power supply on the basic carrier.
Perform a System Erase (frigid start).

See ''System Erase (Frigid Start)''
Restore system programming using one of the following:

The system automatically cold-starts.
Card''. To back up onto a
that follows this section.
above for instructions.
Issue 1
June 1997
Page 4-31