MP01370 SC008-A schem

This document is a "Field Maintenance Print Set" from Digital Equipment Corporation (DEC), primarily dated between 1982 and 1985. It provides detailed technical specifications and diagrams for their "Star Coupler" system, including specific models like SC008 and a 4-node star coupler.

The set includes:

• Table of Contents: An index of various components and assemblies, such as Star Coupler and Cabinet Assemblies, Expander units, Door Assemblies, Modules, Cables, and labels.
• Unit Variations: Specific configurations for the SC008 series (SC008-AA, SC008-AB).
• Assembly and Detailed Diagrams: Illustrations showing the physical structure, component placement, and assembly details of the star coupler and its sub-assemblies.
• Parts Lists (Bill of Materials): Comprehensive listings of all components, including part numbers, descriptions (e.g., coax connectors, resistors), and quantities, for both the overall assembly and specific printed circuit boards.
• Electrical Schematic: A detailed circuit diagram for the 4-node star coupler, illustrating its two distinct data paths (Path A and Path B) with associated transmit and receive lines, specific resistor values for impedance matching, and a critical note about the isolation of Path A's ground from Path B's ground.

The document serves as a complete technical reference for the manufacturing, assembly, and field maintenance of the Digital Equipment Corporation Star Coupler system. It also includes disclaimers stating that the material is for information purposes only, subject to change, and proprietary to DEC.