VAX 4000 Model 300 Troubleshooting Manual

This document, "VAX 4000 Model 300 Troubleshooting and Diagnostics," serves as a guide for isolating and diagnosing problems with the VAX 4000 Model 300 system.

It is organized into three main chapters and an appendix:

• Chapter 1: Troubleshooting During Power-Up addresses issues encountered when the system is turned on, covering problems during self-tests (e.g., no power, console display issues) and during the boot sequence (e.g., boot failures from RF-Series Integrated Storage Elements or tape drives). For each problem, it provides possible causes and corrective actions.
• Chapter 2: Troubleshooting During Normal Operation addresses problems that occur during regular system use. This includes general system issues (e.g., CPU problems, power loss, overheating, system halts/reboots) and specific problems related to RF-Series Integrated Storage Elements and various tape drive models (TF85, TK50, TK70, TLZ04). It offers possible causes and corrective steps.
• Chapter 3: Running the MicroVAX Diagnostic Monitor (MDM) details the use of an optional software package for system diagnostics. MDM helps isolate and identify faults, display system configuration, and test device functionality. It outlines when to use MDM (e.g., new system, added device, error messages, periodic testing), its limitations (reads but does not write to drives, requires media for some tests), preparation procedures for different system configurations (diskless/tapeless, hard disk, dual-host), and various main menu options (e.g., 'Test the System' for comprehensive testing, 'Display System Configuration and Devices' to view recognized hardware, and 'Select Single Device Tests' for targeted diagnostics). It also explains how to start and exit MDM.
• Appendix A: System Controls and Indicators provides illustrations showing the location of key system controls and indicators on components like the System Control Panel, Power Supply, Integrated Storage Element, Console Module, and different tape drives.

The document consistently provides possible causes and corrective actions, advising users to contact Digital service representatives if suggested solutions do not resolve the issue.