Paper Tape Reader and Punch

This document from Digital Equipment Corporation (dated 1973) serves as an Engineering Change Order (ECO) log for the PC04 Paper Tape Reader and Punch. It outlines two specific changes:

• PC04-00057 (Code D, ML E): A manufacturing cost reduction involving a transition from an aluminum bezel, reader plate, and tape path guide to plastic and die-cast designs.
• PC04-D0058 (Code F, ML F): A service and maintenance update involving the addition of regulator board drawings to manuals, replacing a fast-blow fuse with a slow-blow fuse on the power regulator to prevent failures during power cycles, and including the Illustrated Parts Breakdown (IPB) in the accessory list.