M3091DC Image Scanner Operation Guide 4-3
After restoring the automatic document feeder
into position, make sure that it is closed
completely. If the automatic document feeder
is not properly closed, a paper jam or reading
error may occur.

4.2 Daily Maintenance

To use the image scanner over a long period of time, you must perform
some tasks daily. Keep the following point in mind:
If the equipment surface, document support, or automatic document
feeder is soiled, clean it according to Section 4.3, "Cleaning."
Especially, be sure to clean the automatic document feeder.
Interface connectorCheck that both edges are
closed completely