AT&T 3.0 manual Replacing the Processor Module, If possible, save system programming

Processor Problems

Replacing the Processor Module

A failed processor module must be replaced immediately.

To replace the processor module, follow the steps below.

1If possible, save system programming.

See Appendix D, “Backing Up with a Memory Card.” To back up onto a floppy disk, see System Programming and Maintenance (SPM).

2Power 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.

3Unplug the D8W cord(s) connecting the SMDR printer and/or system programming PC.

4Remove the processor module.

5Inspect the processor module for any visible problems.

6Inspect the carrier.

7For 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” that follows this section.

8Install the new processor module.

9Power 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.

The system automatically cold-starts.

10Perform a System Erase (frigid start). See “System Erase” above for instructions.

11Restore system programming using one of the following.

4-30Control Unit Problems