TZ877 Magazine and Cartridge Tape Subsystem Service Manual

This service manual, intended for Digital Services engineers, describes the TZ877 Magazine and Cartridge Tape Subsystem and the TZ87 tape drive, focusing on their operation, troubleshooting, maintenance, and repair.

Key aspects covered include:

• System Overview: Describes the TZ877 as an electromechanical device for automatic, sequential tape operations, detailing its storage capacity (up to 10.0 GB native or 20.0 GB compressed per cartridge, with total capacities up to 140 GB), and its main hardware components (Loader Transfer Assembly, TZ87 tape drive, Controller Module, Power Supply, etc.). It also outlines the various operating modes (OCP Disabled, Automatic, Manual, Service) and specifications.
• Operating Procedures: Explains how to use the Operator Control Panel (OCP) for cartridge selection, loading/unloading, and density selection, as well as procedures for handling the magazine and understanding power-on self-tests (POST).
• Troubleshooting: Provides guidelines for avoiding common problems, identifies non-detectable Field Replaceable Unit (FRU) failures, details various error conditions (soft errors, common failures), and offers procedures for diagnosing and clearing magazine, loader, power, and cartridge motion faults.
• FRU Removal and Replacement: Contains comprehensive instructions and guidelines for replacing all major components, including the controller module, loader transfer assembly, tape drive, fan, power supply, and operator control panel.
• Diagnostic Utilities and Tests: Describes the TZ87's diagnostic tools, including POST, Burn-in Loopback Mode, SCSI Bus Termination, and various specialized tests (Positioning, Streaming Write/Read, SCSI Level Tests) for verifying functionality and isolating faults.
• Head Cleaning: Includes a dedicated procedure for cleaning the read/write head using a CleaningTape III cartridge.