LA36 DECwriter II

This document is the "LA36 DECwriter II Maintenance Manual," a comprehensive guide for the LA36 DECwriter II, a 30-character per second impact printer. It covers the printer's general description, including its physical and functional characteristics, and supports various baud rates and continuous forms.

The manual is structured into several key sections:

• Installation: Details site considerations, system configuration, unpacking, and initial setup and checkout procedures.
• Operation: Explains operator controls and provides instructions for loading paper, changing ribbons, and basic troubleshooting.
• Theory: Offers in-depth information on the microprogram (e.g., initialization, positioning, speed, input, bell, print, line feed, and last character visibility routines), timing, control logic, keyboard system, data communications interfaces (current loop, EIA/CCITT, UART), clock logic, character buffer/generator, print head system, line feed stepper, wake-up circuit, power supply, and the various printer mechanisms (carriage, ribbon feed, paper feed).
• Electrical Servicing: Includes detailed electrical tests, troubleshooting charts, and procedures for encoder signal processing, servo speed, line feed stepping, bell, printable characters, current loop, and serial line interfaces, along with DC supply voltages.
• Mechanical Servicing: Provides removal, replacement, and adjustment procedures for virtually all mechanical assemblies and components, such as the print head, timing belt, keyboard, printer mechanism, motors, ribbon drive components, and paper feed system.
• Engineering Drawings and Illustrated Parts Breakdown: Contains complete engineering drawings, material lists, and an illustrated parts breakdown with explanations on its usage for part identification and ordering.