Tape Drive TU78

This document provides a comprehensive field maintenance print set for the TU78 Tape Drive (Model TU78). It includes a detailed table of contents listing engineering drawings for various sub-assemblies such as the tape drive, formatter logic, read channels, error correction, mass bus controls, micro-controllers, power supplies, regulators, and backplanes. The document also contains installation and assembly notes, parts lists for different variations (TU78-AF, TU78-AJ, TU78-AB, TU78-AD, TU78-BB, TU78-BD, TM78-AB, TM78-BB), and detailed diagrams of the internal components and circuitry.