Command Timeouts

This Field Change Order (FCO) details the resolution for "Command Timeouts" and various system-level interface problems identified in RF31 disk drives. It applies to specific RF31 revisions (F06, H06, J06) installed in VAX 4000, 5000, dual host 3800, and VAXft systems. The solution involves installing an electronics module containing updated firmware (V254 or V256), which corrects issues such as high ECC uncorrectable errors, inconsistent Revector Control Tables (RCT), and excessive Positioning in Progress (PIP) errors. The document includes detailed instructions for replacing the module, including pre-requisite parameter recording, physical installation using anti-static procedures, and post-installation system verification.