VK100 Pocket

This document serves as a comprehensive service guide for the VK100 (GIGI) terminal, published as the 1st Edition in January 1981 by Digital Equipment Corporation. It covers troubleshooting, operational summaries, testing procedures, adjustment notes, and component removal/replacement instructions.

Key aspects include:

• Troubleshooting (Chapter 1): Provides detailed guidance on identifying and resolving terminal issues using internal self-tests and error codes (fatal and nonfatal). It includes tables listing LED error codes, their meanings, and recommended Field Replaceable Units (FRUs) for replacement. A comprehensive troubleshooting table addresses various problems such as power failures, video display issues (color and monochrome monitors), hardcopy output problems, and communication errors. Recommended spare parts lists for both on-site support and Digital Servicenters are also provided.
• Operating Summary (Chapter 2): Summarizes the terminal's operation, detailing the SET-UP default switch pack settings (for baud rate, parity, communication interface, power frequency, etc.) and a complete list of SET-UP parameters. These parameters control various terminal features, including transmit/receive speeds, local/on-line modes, display settings, cursor types, keyboard functionalities, and self-test selections.
• Testing (Chapter 3): Outlines procedures for running power-up self-tests (which automatically check major internal circuits like microprocessor, memory, CRT controller, keyboard, and communications) and diagnostic tests. Diagnostic tests include external and hardcopy communications tests (requiring loopback connectors), a display test (showing various color screens and crosshatch), and a color bar test. The chapter also explains error codes and their interpretations.
• Adjustments (Chapter 4): States that the VK100 terminal itself is not adjustable; issues typically require module replacement. Adjustments to the user-provided video monitor are the responsibility of the customer or a qualified service technician.
• Removal and Replacement (Chapter 5): Provides step-by-step instructions, accompanied by illustrations, for disassembling and reassembling the terminal's mechanical subassemblies. This includes procedures for removing the top cover, keyboard assembly, power supply assembly (including regulator board and fan), and the terminal logic board.
• Physical/Functional Block Diagram (Chapter 6): Includes a block diagram illustrating the internal components and connections of the VK100 terminal, such as AC input, power supply, logic board, and various interfaces.

The document emphasizes that most issues with the VK100 terminal are resolved by identifying and replacing the faulty module, as the unit itself offers no internal adjustments beyond software parameters.