MD400 Scanner Pocket Service Guide

This document is the MD400 Scanner Pocket Service Guide, published by Digital Equipment Corporation in May 1991.

It serves as a compact reference for installing and servicing the MD400 scanner, which is a rebranded Ricoh IS50 Image scanner available in 120V and 220-240V variants. The guide covers:

• Introduction: General information, hardware and software options (including compatibility with VAXstation and DECstation PCs), product documents, and detailed system configurations for both PC (parallel interface) and VAX (SCSI interface) environments.
• Installation: Pre-installation checks, physical characteristics of the scanner, step-by-step installation procedures, including DIP switch settings for normal operation, and post-installation verification.
• Troubleshooting: Guidance for VAXstation and PC software issues (referring to vendor support for the latter), shading correction, and the overall hardware service strategy.
• Service Features: Details on using the scanner's indicators, DIP switches, built-in self-tests (power-on, lamp test), and unit diagnostics to identify and resolve issues, including specific indicator displays for various errors (e.g., Power/ROM/RAM error, Illumination error, Optical system error, Driving system error, ADF residual paper error).
• Spares List: A list of Field Replaceable Units (FRUs), including scanner models, ADF, interface kits, and a replacement lamp.
• Technical Tips: Information on how the SCSI scanner appears to a workstation, voltage selection, and limitations regarding SCSI cable lengths.

The guide emphasizes using built-in tests and indicator displays to localize faults and replace defective FRUs, making it a practical resource for service personnel.