DR11-B

This document is a Field Change Order (FCO) for the Digital Equipment Corporation M9680 DR11-B maintenance module. It describes a problem where the maintenance module's time constant is too long, which can cause Non-Processor Request (NPR) latency issues with other peripherals during system exerciser programs. The fix requires reducing the value of capacitor C1 to 270 pfd, resulting in a nominal time constant of 1.5 microseconds. The document outlines in-plant and field implementation instructions, noting that installation and testing take approximately 0.5 hours.