M931

This document is an engineering schematic titled "15 TERMINATORS WITH IND. RES." (Drawing Number M931-0-1, Revision D), created by Digital Equipment Corporation and copyrighted in 1971. It is intended for test and maintenance purposes and contains proprietary circuit information.

The core of the document features two main circuit diagrams, each depicting a termination network. These networks predominantly use arrays of resistors (including 4.7K, 220 ohm, and 1K values) and diodes (specified as D662), connected to various pins and integrated circuits (E1 and E2, identified as DEC2501). Several capacitors are also incorporated for filtering and bypassing.

Supporting information includes:

• General Component Specifications: Default values for capacitors (.047UF, 16V), diodes (D662), ICs (DEC2501), and resistors (1K, 1/4W, 5%) are provided unless otherwise indicated.
• Parts List: A detailed table enumerating all components by item number, DEC part number, description (e.g., handle, eyelet, various resistors, capacitors, diodes, and ICs), and quantity. It also lists related manufacturing documentation like the etched circuit board, module ECO history, and assembly layouts.
• Transistor & Diode Conversion Chart: Provides cross-reference information, specifically noting D662 is equivalent to 1N645.

In essence, the document provides a comprehensive technical overview, including circuit design, component details, and manufacturing notes for a set of 15 terminators.