VT100 Series

This pocket service guide provides comprehensive instructions for servicing the VT100-family video terminals, including VT100, VT105, VT125, and VT132 models, along with their various options and upgrade kits. The document is structured into seven main sections:

1. Troubleshooting: Details procedures for diagnosing issues, interpreting self-test error codes from keyboard LEDs and screen displays, and provides a list of recommended spare parts to facilitate repair down to the field-replaceable unit (FRU) level. Specific troubleshooting steps are given for basic VT100 terminals and their variations.
2. Set-up Summary: Outlines general and specific SET-UP configurations (A, B, C) for the different terminal models.
3. Testing: Describes various diagnostic tests, including power-up, data loopback, EIA, keyboard functionality, SET-UP screen, and video adjustment patterns. It also includes specific test procedures for the VT1XX-AC Printer Port and VT105 Waveform Generator.
4. Video Alignment: Provides procedures for adjusting Ball Brothers and Elston/DIGITAL video monitors, covering settings for brightness, yoke, vertical height, horizontal width, centering, linearity, hold, and focus.
5. Module Removal and Replacement: Offers step-by-step guides for safely removing and installing internal components such as access covers, terminal controller boards, advanced video option boards, ROMs, printer port/VT125 STP boards, VT105 waveform generator boards, VT125 graphics boards, 20 mA current loop boards, keyboard assemblies, video monitor boards, flyback transformers, power supplies, RF shields, DC power harnesses, expansion backplanes, and CRT and yoke assemblies. It also includes crucial safety information on CRT discharge, handling, storage, and disposal.
6. Options: Details the installation and checkout procedures for various optional features, including the advanced video option, 20 mA current loop option, printer port option, and VT125 Graphics Processor upgrade kits.
7. Board Configurations: Presents essential configuration information, such as ROMs, jumpers, and switch settings for all supported terminal boards and their variations.

An appendix includes a VT100 Physical Functional Block Diagram. The guide emphasizes correct procedures for FRU replacement, necessary adjustments, and safe handling of components.