AT&T MERLIN LEGEND Installation & Maintenance Manual page 508

Maintenance and Troubleshooting
5. Restore power by turning on
a. any auxiliary unit (if present)
b. the power supply module(s) on the expansion carrier(s)
c. the power supply module on the basic carrier
The system automatically cold starts.
Replacing the Processor Module
A failed processor module must be repaired immediately. Follow
these steps to replace a failed processor module:
1. If possible, save all the translations to a floppy disk by using
the backup function.
Note: When the processor module fails, backup is usually
impossible.
2. Power down the system by turning off
a. the power supply module on the basic carrier
b. the power supply module(s) on the expansion carrier(s)
c. any auxiliary power unit (if present)
3. Unplug the SMDR printer and/or system programming PC
cords if present.
4. Remove the processor module.
5. Inspect the processor module for any visible problems.
Inspect the carrier backplane.
6.
7. Remove the feature module from the processor module and
install it in the new processor module.
8. Install the new processor module.
5-30 Maintenance