TU80 Tape Subsystem

This technical manual provides comprehensive information for the installation, operation, and maintenance of the TU80 Tape Subsystem. The TU80 is a microprocessor-based streaming tape unit designed for transferring Phase Encoded (PE) data to and from half-inch wide magnetic tape, integrated into a standard H9643 cabinet with its formatter and power controller.

Key components of the subsystem include the TU80 Tape Transport, an M7454 UNIBUS Adapter Module (for PDP-11 and VAX Processors), and an 874 Power Controller. The tape transport features a read/write head, reel hubs, servo motors, power supply, air bearings, and various printed circuit modules for servo power amplification, read/write functions, data encoding/decoding, and dual microprocessor control. It supports three operating modes: 25 ips Start/Stop, 25 ips streaming, and 100 ips streaming, offering dual data transfer rates of 40 KB/sec and 160 KB/sec respectively.

The manual details:

• General Description: Functional and physical descriptions of the TU80 and its components.
• Installation and Checkout: Site requirements, delivery acceptance, unpacking, mechanical and electrical installation, UNIBUS adapter module installation, and acceptance diagnostic tests.
• Operation: Control panel functions, tape loading/unloading procedures, and operator corrective actions for malfunctions indicated by fault codes.
• Theory: In-depth explanation of the TU80's operational principles, including power generation, pneumatic system, read/write/servo board functions, formatter/control functions, head operation/recording, and interface/timing considerations.
• Maintenance: Instructions for removing and replacing field-replaceable parts, component access, and detailed diagnostic procedures for troubleshooting and verification.

The document emphasizes the use of off-line and on-line diagnostics, including Power-Up Health Checks and operator tests, to ensure proper functionality and to isolate faults. It also references additional documentation for programming, troubleshooting, and parts breakdown.