DECmpp 12000/Sx Model 100 Hardware Service Manual

This document is the DECmpp 12000/Sx Model 100 Hardware Service Manual, published in September 1992 by Digital Equipment Corporation. It provides comprehensive service and diagnostic procedures for DECmpp 12000/Sx and DECmpp 12000-LC/Sx Series systems, intended for Digital Services personnel and self-maintenance customers.

The manual covers:

• System Overview: Describes the DECmpp 12000/Sx systems as Single-Instruction, Multiple Data (SIMD) computers, detailing the Data Parallel Unit (DPU) and front-end server components, along with power-up and power-down sequences.
• Controls and Indicators: Explains the functions and locations of DPU switches, front panel indicators, and various Printed Circuit Board (PCB) service indicators.
• Power Supply: Guides on checking and adjusting DPU power supply voltage levels.
• Hardware Components: Identifies cables, connectors, and auxiliary PCBs, and provides detailed procedures for removing and replacing DPU components such as ACU, PE array, and router PCBs, as well as power and fan trays.
• Diagnostic Software: Describes how to use provided diagnostic software to test DPU components (ACU, PE array, router, memory, X-Net), run test suites, suspend programs, and interpret log file messages (including fault codes).
• Upgrades: Explains how to upgrade PE arrays by reconfiguring backplane jumpers.
• Appendices: Includes a recommended spares list and reference pages for Data Parallel Unit commands.