VAX 4000 Model 100A Troubleshooting & Diagnostics Information

This manual, "VAX 4000 Model 100A Troubleshooting and Diagnostics Information" (August 1993), provides procedures and diagnostic tools for solving basic problems with the VAX 4000 Model 100A system.

It is structured into two main chapters:

1. Troubleshooting and Diagnosing Problems: This section guides users through initial problem-solving steps, including checking cables and power, and using a troubleshooting table that matches symptoms with possible causes and solutions. It describes how to interpret power-up tests, self-tests, and diagnostic commands (like SHOW CONFIG) to identify device failures. It also outlines the necessary information to collect (error messages, self-test results, LED status, serial numbers) before contacting Digital Services for support.

2. Running the Diagnostic Monitor (MDM): This chapter details the use of the MicroVAX Diagnostic Monitor (MDM), a software package designed to isolate faults, display system configurations, and test device functionality. It explains MDM's limitations (e.g., it reads from drives but does not write to prevent data loss) and provides detailed instructions for preparing and booting MDM from various media, such as tape drives, hard disks, or CD-ROMs, including specific procedures for diskless systems and DSSI VAXclusters. The manual describes MDM's main menu options, which allow users to "Test the System" for comprehensive diagnostics, "Display System Configuration and Devices" for hardware identification, and "Select Single Device Tests" for targeted component testing. Finally, it covers how to properly exit MDM and reboot the system.

In summary, the document serves as a practical guide for users with some computer experience to systematically diagnose and resolve hardware issues on their VAX 4000 Model 100A system using both manual checks and specialized diagnostic software.