Field Change Order

This Field Change Order (FCO) outlines the steps to upgrade the K.STI Microcode from version 22 to version 26 on HSC50 L0108-YB modules. It provides clear instructions for system preparation, including suspending traffic and dismounting drives, followed by detailed rework procedures involving the replacement of 12 PROMs using an IC insertion tool. The document also includes comprehensive testing and verification procedures using off-line diagnostics (SIZE, TEST BUS) and system tape tests (ILTAPE, ILEXER) to ensure the hardware is functioning correctly post-upgrade. Safety warnings regarding static and shock sensitivity are emphasized, along with logistics notes regarding module nomenclature.