Prioris LX5000 RTC

This document outlines a Field Change Order (FCO) for Prioris LX models (FR944WW/LX5150, FR945WW/LX5200) to resolve a system Real Time Clock (RTC) issue. A circuit design flaw at E48 pin 15 allows erroneous writes to the RTC during system resets, causing CMOS checksum errors and configuration loss. The solution requires replacing the existing RTC chip with a modified assembly (part number 70-33198-01). The document provides detailed step-by-step instructions for backing up configuration files using the SCU utility, replacing the hardware component, restoring BIOS/EISA parameters, and verifying the repair with AMI diagnostics.