DA11-F Bus Window Control

This document is an Engineering Change Order (ECO) log for the M7284 DA11-F Bus Window Control module. It details five specific engineering changes issued between January and December 1973, addressing issues such as reversed capacitor polarities, incorrect etching, circuit schematic errors, missing parts, and timing issues. Each entry provides the problem description, the required correction, the effectivity (in-plant or field), and where applicable, installation time and kit contents.