The Developer Waste Container gets replaced after every 800,000 images. When the machine has reached the limit set for the Developer Waste Container, an alert will appear in the system messages portion of the user interface.
Double-click the system alert to see details about the action needed, instructions on how and where to return the used container, as well as the location of the container.
See Contacting Xerox to get the correct part number for this container.
Make sure there are no jobs running.