DECpc LPx/LPx+ Service Maintenance Manual

This document is a service maintenance manual for the Digital Equipment Corporation (Digital) DECpc LPx, LPx+, and LPx 560/566 series PCs. It covers the following key areas:

• Product Overview: Technical specifications and features for the LPx and LPx+ lines, including CPU, memory, expansion, and storage details.
• System Utilities & Configuration: Guidelines for using the system utilities diskette, BIOS setup utility, and configuring hardware settings such as passwords and port settings.
• Service Procedures: Detailed safety requirements, including ESD precautions, and step-by-step procedures for removing and replacing hardware components, including drives, the main logic board, power supply, and CPU modules.
• Troubleshooting: Comprehensive diagnostic information, including beep codes (fatal and non-fatal), post-boot messages, and specific troubleshooting tables for various hardware issues.
• Device Mapping: Tables for memory, I/O, CPU I/O, interrupt levels, and DMA channel assignments.
• Pass/Fail Criteria: Defined criteria for final testing and accepted operating systems.

The manual includes numerous figures outlining internal components, jumper locations, and socket layouts to assist authorized service engineers.