550 wirelist

This multi-part document provides comprehensive technical information for the Digital Equipment Corporation (DEC) Tape Control 550, with most sections dating from 1964.

It includes:

• Manufacturing and Assembly Indexes: An "Order of Manufacturing" and "Index Wiring List" outlining sequential steps for assembly and wiring, along with corresponding drawing numbers.
• Master Drawing Lists: Detailed directories of all related technical drawings, categorized by mechanical, electrical, checkout, service, and user documentation.
• Detailed Wiring and Component Specifications: Sections dedicated to "IOT Control" wiring, "Power Wiring," "Grounds," "Terminator List," and a "Components List," providing pin assignments, color codes, values, and locations for various electrical connections and parts.
• Module Information: A "Module Procurement List" detailing required modules and quantities, and "Module Location - Module Jumpering" instructions.
• Special Wiring Instructions: Specific guidelines for critical voltage and ground connections.
• Panel Layout: A visual representation of the control panel and its connection points.
• Spare Parts List: Itemizes essential spare modules and notes the requirement for accompanying schematics and descriptions.
• Extensive Checkout Procedure: A multi-page guide (34 pages) for thoroughly testing the DEC Tape Control 550/555. This procedure covers general test equipment requirements (scope, tester, computer, tapes) and detailed steps for verifying power, control pulses, selection control, mode and motion functions, write/read modes, information buffer, shift register, mark track/error detection, and error status conditions. It also details the process for generating Engineering Change Orders (ECOs) to document discrepancies and update technical documentation during the checkout process.