FCO DWBUA-1002, After powerfail, system bugchecks when warm restart

This Field Change Order (FCO) DWBUA-1002 outlines a critical retrofit for VAX 82XX, 83XX, 85XX, 87XX, and 88XX systems configured with DWBUA and Batterybackup options. The problem addressed is a system bugcheck occurring during a warm restart following a power failure.

The solution involves upgrading specific Read-Only Memory (ROM) chips on the T1010 module. This FCO specifically replaces ROM P/N 23-253F4-00 with 23-313F4-00, 23-251F4-00 with 23-312F4-00, and 23-314F4-00 with 23-329F4-00. The upgrade is only applicable to T1010 modules with revisions F1-F7, while modules with H1-H7 revisions do not require this update. FCO DWBUA-R001 (T1010-Rev "F") is a prerequisite.

The installation procedure, estimated to take 1 hour, includes:

1. System shutdown and power off.
2. Ensuring proper electrostatic discharge (ESD) protection using a VELOSTAT kit.
3. Accessing and removing the T1010 module.
4. Checking the module's revision (only F1-F7 can be upgraded).
5. Unplugging the old ROMs and installing the new ones.
6. Reinstalling the T1010 module and reassembling the system.
7. Powering on the system and verifying the module's self-test (amber light).
8. Verifying the FCO installation by running EVCBB.EXE.
9. Bringing up the operating system.
10. Updating the Site Management Guide and reporting the FCO activity.

The document provides detailed, step-by-step installation instructions tailored for three different system configurations: VAX 82XX/83XX Configuration I, VAX 82XX/83XX Configuration II, and VAX 85XX/87XX/88XX. Special attention is given to ESD precautions due to sensitive components.