Upgrading the TX800 Series Magazine Tape Subsystem

This document, intended for Digital Services field engineers, provides instructions for upgrading the TF837 and TZ857 magazine tape subsystems. It details the necessary field replaceable units (FRUs) for these upgrades, including replacing controllers and tape drives. The guide includes a 'warm swap' procedure for controller modules, instructions for physical removal and installation of hardware components, and a process for verifying the completed upgrade.