DEC 3000 Model 400/400S AXP System

This document provides comprehensive service information for the DEC 3000 Model 400/400S AXP system. It is designed for service personnel and customers with maintenance agreements. The content is structured as follows:

• System Overview: Features and components.
• Configuration: Settings for jumpers, storage devices, and memory.
• Console Commands: Detailed operations for system control.
• Diagnostics: Procedures for system testing, including power-on diagnostics and specific subsystem tests.
• Troubleshooting: LED codes, error messages, and troubleshooting tables.
• Removal and Replacement: Instructions for replacing Field Replaceable Units (FRUs).
• Appendices: Firmware upgrade instructions, error/status message definitions, and a recommended spares list.