DEC-TU56-IPB-2 TU56 IPB 1973

This document is an Illustrated Parts Breakdown (IPB) for the Digital Equipment Corporation (DEC) TU56 DECtape unit, originally published in 1973.

Its primary purpose is to provide a comprehensive guide for identifying, locating, and ordering all components of the TU56 DECtape, from major assemblies down to individual parts, facilitating maintenance, repair, and understanding of the product's construction.

Key features and how to use the IPB include:

• Hierarchical Organization: Parts are listed in an indented format using asterisks to indicate their subordination within assemblies, allowing users to trace parts to their next higher assembly.
• Navigation and Cross-Referencing: A "Major Assembly Locator" serves as the primary index, while "Ref Fig No." columns link illustrations to more detailed breakdowns of subassemblies.
• Part Identification and Procurement: Each entry provides a "Description" with specifications, a "DEC Part No." for ordering, and "Vendor Code/Part No." for items not stocked by DEC.
• Version and Compatibility Information: The "ECO Cut-In" column indicates the Engineering Change Order level at which parts were introduced or modified (with brackets highlighting affected parts), and the "Used On Code" specifies if a part is used in particular product variations.
• Maintenance Details: Symbols like "@" denote attaching hardware, and "(NFR)" identifies parts that are not field repairable.
• Revision History: A table details printing dates, ECO levels, and pages affected by updates, ensuring users have information on the document's version control.

The document includes detailed exploded diagrams of major assemblies (DECtape, Front Panel, Control Panel, Chassis, and Power Supply) alongside corresponding parts lists.