Dectape Transport TU55 Instruction Manual

This manual provides instructions for the operation, maintenance, and theory of operation for the Digital Equipment Corporation (DEC) Type TU55 DECtape Transport.

Summary of Key Information:

• Product Description: The TU55 is a solid-state, bidirectional, magnetic-tape handling device designed for high-speed loading, readout, and program updating in DEC computer systems. It uses specialized guides for hydrodynamic tape-to-head contact, eliminating the need for capstans, pinch rollers, or drag pads.

• Operational Modes: The device supports two modes:

  • Remote/Programmed Control: Operated via commands from a connected computer through a DECtape control system.
  • Local (Manual) Control: Operated via front panel rocker switches, primarily for loading tape and basic maintenance checks.

• Key Technical Features:

  • Tape Drive: Uses independent induction motors for each reel with electromagnetic brakes.
  • Interface: Connects to DECtape control systems using FLIP CHIP modules and standard signal logic (ground and -3v).
  • Modularity: The system is composed of standard FLIP CHIP logic modules, which are listed and described within the manual for maintenance purposes.

• Maintenance: The manual outlines weekly and monthly preventive maintenance schedules, emphasizing the importance of cleaning tape handling surfaces and heads. It also provides procedures for tape tension adjustment, head output verification, and troubleshooting via logic signal analysis and switch-based testing.

• Appendices/Support: The document includes comprehensive engineering drawings, schematic diagrams of various modules (e.g., SCR Motor Driver, Relay, Inverter), and a list of recommended spare parts to facilitate field repairs.