DEC-PC04-IPB-1

This document is an Illustrated Parts Breakdown (IPB) for the DEC PC04 Paper Tape Reader/Punch, published in 1973 by Digital Equipment Corporation.

Its primary purpose is to help users identify and order parts for the PC04 device. Key features and sections include:

1. Organization: Structured according to engineering drawing, with a Major Assembly Locator (first illustration) serving as an index to all figures.
2. Indented Parts List: Provides a hierarchical breakdown of assemblies and their components, using asterisks to indicate subordination and aiding in identifying next higher assemblies or alternative parts.
3. Column Callout Descriptions: Explains the information in the parts lists, covering:
   • Figure & Item Numbers: For locating parts in illustrations.
   • Description: Part names, specifications, and subordination levels.
   • DEC Part No.: Digital Equipment Corporation's ordering number.
   • ECO Cut-In: Indicates the Engineering Change Order (ECO) level at which parts were added or modified, crucial for ensuring the correct version.
   • Vendor Code/Part No.: For parts not stocked by DEC, with a cross-reference to a spares catalog.
   • Used On Code: Letters indicating specific option variations a part is used with (based on Figure 1).
   • Ref Fig No.: Cross-references to other figures for higher assemblies or detailed breakdowns.
4. Symbol Usage: Explains specific symbols used in illustrations and lists, such as hardware designators (S for screws, W for washers, N for nuts, R for retaining rings), the "@" symbol for attaching hardware, and "(NFR)" for non-field repairable assemblies.
5. Revision History: Tracks printing dates and ECO levels for the manual itself.
6. Legal Disclaimers: States DEC's right to modify products, disclaimer of responsibility for errors, and non-granting of licenses through the manual.

In essence, the IPB is a comprehensive guide for identifying, understanding the composition of, and accurately ordering components for the PC04 Paper Tape Reader/Punch, including information about part variations and changes over time.