CPU Module May Produce Wrong Answers to Floating Point Operations

This document outlines Field Change Order (FCO) KA660-0001, which addresses a defect in KA660 CPU modules (models M7626-AA and M7626-BA) that can result in incorrect floating point calculations and LOGIN/LMF password failures. The issue specifically affects revisions Ax and Bx. The solution is to replace the CPU module with one of revision C01 or greater using the appropriate EQ kit. The procedure involves standard electrostatic discharge (ESD) precautions, system shutdown, hardware replacement, and verification via self-test. Detailed instructions and LARS reporting codes are provided for customers and field engineers.