Disk Power and Motor Control

This document is a Digital Equipment Corporation Engineering Change Order (ECO) log regarding Disk Power and Motor Control (7006156). It lists three specific technical modifications to address hardware issues:

1. 7006156-00001 (Sep-71): Replaces an overly long chassis track screw that was hitting a cable in slot A1 with a shorter 5/16-inch screw.
2. 7006156-00002 (Jan-73): Fixes an issue where cooling fans rubbed against their screens by using washers to provide additional clearance.
3. 7006156-D0003 (Sep-73): Corrects a wiring configuration error on Transformer T1 caused by incorrectly numbered taps, which led to drive motor overheating and speed variations. The fix involves relocating the incoming line to terminal #1.