H720 Power Supply and Mounting Box Engineering Drawings

This document is a technical collection of engineering drawings, parts lists, and maintenance specifications for the Digital Equipment Corporation H720 Power Supply and its associated mounting hardware, as well as supplemental technical information for the LT33 Teletype units.

Key components of the document include:

• H720 Power Supply: Detailed schematics, assembly diagrams, and comprehensive parts lists for various models (A through F). It covers input voltage settings, wiring tables, and regulator board layouts.
• Mounting and Configuration: Mechanical assembly drawings for the power supply and mounting boxes, including cabinet configurations and console assembly details.
• LT33 Teletype Support: A significant portion of the document provides technical specifications for the LT33 series teletypes, including:
  • Modification procedures for upgrading or adjusting teletype models.
  • Packing and installation instructions.
  • Incoming inspection procedures and precise mechanical adjustment standards (clearances, tolerances, and alignment).
  • Schematics for teletype reader control circuits and modifications for different voltages (50Hz/60Hz and 115V/240V).

The document is designed for technical reference, providing the necessary data for assembly, maintenance, and quality inspection of the power and communication components within a PDP-11 or similar computing environment.