Service Maintenance Manual CELEBRIS Pentium PC

This document is the Service Maintenance Manual for Digital CELEBRIS Pentium personal computers, published in November 1995. It serves as a comprehensive troubleshooting and reference guide for A+ certified engineers tasked with servicing these PCs.

The manual begins by describing the Digital CELEBRIS Pentium product line, outlining various low-profile and full-profile models and their significant features, such as PCI local bus technology, memory configurations, and integrated controllers. It then details essential system utilities and configuration procedures, including upgrading or restoring the BIOS (PHLASH.EXE), configuring EPP operation, installing video drivers (DOS and Windows 3.x), and extensively using the BIOS Setup Utility to manage hardware and software settings for various components like diskette drives, video systems, memory, boot sequences, and security options.

A significant portion is dedicated to service procedures, covering safety requirements, recommended tools, and detailed steps for part removal and replacement. This includes instructions for accessing the internal components by removing the cover, diskette drives, main logic board, power supply, and riser card. It also provides installation procedures for upgrading the CPU, external cache, and video memory, as well as replacing the computer battery and connecting diskette and IDE devices.

Troubleshooting is a major focus, offering initial diagnostic steps, a list of beep codes for fatal errors, and explanations for various POST and boot messages with corresponding solutions. Detailed tables address problems, possible causes, and corrective actions for general computer, disk drive, and monitor issues. The document also provides device mapping information, including CPU memory and I/O addresses, interrupt levels, DMA channel assignments, and PCI configuration space. Finally, it outlines the pass/fail criteria for final acceptance testing, ensuring the successful operation and bootstrap of supported operating systems.