TF70 Cartridge Tape Drive Subsystem Service Manual

This service manual provides comprehensive information for the TF70 Cartridge Tape Drive Subsystem, which consists of a TK70 tape drive and a TFK70 DSSI controller module. The subsystem is a streaming tape drive capable of storing up to 296 megabytes of data on CompacTape or CompacTape II cartridges, operating at 90 Kbytes per second across 48 tracks.

The document details the operational aspects of the TK70 tape drive, including descriptions of its controls and indicators (LEDs, unload button, beeper), and step-by-step procedures for inserting and removing tape cartridges, checking tape leaders, and manually rewinding a tape. It also covers the configuration switches on the TFK70 DSSI controller module.

A significant portion of the manual is dedicated to local diagnostics and problem resolution. It describes two types of diagnostics: Power-On Self-Test (POST) for verifying hardware integrity at power-up or reset, and device-resident diagnostic programs (such as DIRECT, DRVTST, DRVEXR, HISTRY, and PARAMS) accessible via the VMS Operating System for in-depth testing and status monitoring. The manual also provides guidance on understanding error conditions, identifying common failure influences (e.g., defective media, operator errors), and offers a table of symptoms, probable causes, and their corresponding fixes. Appendices include extensive lists of detailed POST detected error codes and DSSI event/error codes, along with instructions for routine maintenance like using the head cleaning kit.