RK11-D Disk Control

This document is an Engineering Change Order (ECO) log for the RK11-D Disk Control, covering updates and corrections made from June 1972 through January 1974. The log details various issues, including wiring modifications, backpanel ground adjustments, documentation errors, harness replacements, and updates related to Automatic Wire Tester (AWT) tapes. Several entries provide specific instructions for retrofitting existing units and phase-in requirements for production.