A to hunt for on the DS80249 P Rev 12 is the revision block located in the bottom right corner of the drawing. This block will list the Engineering Change Orders (ECOs) that led to Rev 12.
If you have landed on this page, you are likely staring at a circuit board with that alphanumeric string silkscreened on the edge, or you have just inherited a legacy system with a service manual that references this drawing. This article provides a comprehensive guide to understanding, locating, and utilizing the DS80249 P Rev 12 schematic. ds80249 p rev 12 schematic
By Rev 12, engineers have often realized certain components are unnecessary. You will see "DNP" or "NF" (Not Fitted) on passive components. A to hunt for on the DS80249 P