Rainbow User's Service Guide

This document is the "Rainbow™ User's Service Guide," published by Digital Equipment Corporation in April 1985.

It serves as a comprehensive manual for users to perform maintenance and troubleshooting on their Rainbow computers. The guide provides:

1. Step-by-step instructions for the removal and replacement of major components, including the keyboard, monitor, system unit (main board), various option boards (RX50 controller, memory, communications, hard disk, color/graphics), language ROMs, diskette drives, hard disk drives, power supply, and fan assembly.
2. A troubleshooting appendix that helps users diagnose problems by listing symptoms, error messages, their possible causes, and corrective actions, often referencing specific light displays on the system unit.
3. Information on using diagnostic diskettes to test the computer's components.
4. A list of recommended spare parts with their Digital part numbers.
5. Details on how to order replacement parts and access Digital Equipment Corporation's various customer support services, including on-site service, carry-in service, and DECmailer.

The document also includes important warnings regarding FCC compliance for Class B computing devices and precautions against static electricity when handling electronic components.