DECpc 400 MT/MTE Series

This document is a comprehensive service guide for the Digital Equipment Corporation (DEC) DECpc 400 MT/MTE series computers. It details key system specifications for both models, including CPU options (Intel 80486), memory configurations, and power supply data. The guide includes step-by-step instructions for removing Field Replaceable Units (FRUs) such as side panels, drives, fan assemblies, and expansion boards. Detailed jumper settings for the main logic boards are provided, along with pinout descriptions for various connectors (VGA, keyboard, mouse, parallel, and serial). Finally, the document offers extensive troubleshooting aids, including POST error messages, beep codes, I/O address maps, memory maps, and diagnostic instructions for the QAPlus software, followed by a list of part numbers.