Plotter keeps feeding media; Fan runs with no media in plotter.

A.    The fan(s) provide a vacuum for pulling the media down flat. Power to
      the fan(s) is controlled by the photo sensor in the left pinch roller
      housing.

B.    The plotter sizes the media based on what the photo sensor detects. It
      will pull the paper forward until the photo sensor detects the end of
      the media.

C.    If there is anything obstructing the photo sensor, such as a scrap of
      media or excessive dust, then the fan(s) will not turn off. To remedy,
      perform the following:
      
      1.    Remove any scraps of media under the left pinch roller housing
            area.
      
      2.    Use compressed air to remove any excessive dust from the photo
            sensor. Apply compressed air from several angles around the left
            pinch roller housing to ensure that it is cleaned.
      
      3.    If problem still exists, the photo sensor may be faulty. If it
            is, then the plotter requires service.