Ground Currents Cause System Errors

This Field Change Order (FCO KN430-0003) addresses an issue where high ground currents in the H7884-AA 20A Power Subsystem (FEU) cause random system errors, system hangs, and fan speed errors in DEC 4000-6XX and VAXft Model 810 systems. The solution requires replacing the existing FEU with a part revision D06 or higher. The document details the necessary electrostatic discharge (ESD) precautions, the removal and replacement procedure for the power subsystem, system verification steps, and reporting requirements via the LARS form.