Intermittent Failures Due to Tape Positioning

Field Change Order (FCO) TA90-0001 addresses a known issue with intermittent tape positioning at the physical end of tape in TA90 Tape Control Units (TCUs). The solution involves updating the formatter software to revision 2.3 (major revision D). The document provides a detailed installation procedure, including a mandatory caution regarding electrostatic discharge, instructions for module replacement using the Velostat kit, and verification steps using diagnostic tools and LEDs. This upgrade is applicable to all TA90 TCUs with formatter software versions earlier than 2.3.