VT101 Series

This document is the "VT101 Series Pocket Service Guide" (EK-VT101-PS-001) for Digital Equipment Corporation's VT101 series video terminals.

It serves as a comprehensive manual for service personnel, covering troubleshooting, maintenance, and configuration. The guide details a range of self-tests (power-up, data loopback, EIA control lines, printer loopback, video adjust) and provides error codes for diagnosing common issues, including power-related problems, keyboard malfunctions, and printer issues.

A significant portion is dedicated to Field Replaceable Unit (FRU) removal and replacement procedures for various components like the terminal controller board, power supply, video monitor, CRT, and keyboard parts. Further sections cover video monitor alignment, various terminal controller board configurations (VT101, VT102, VT131), and options such as the 20 mA Current Loop.

It concludes with operator reference material (SET-UP summaries) and appendices containing related documentation, cable information, and physical functional diagrams, along with a recommended spares list.