With the redrive assembly removed from the printer, enter
Diagnostics mode and run the printer test from tray 1 and observe
the media as it passes over the exit sensor. Check to see that the
sensor flag is operating correctly. If the sensor flag and hardware are
operating incorrectly, repair or replace the failing sensor assembly. If
no problem is found, check the fuser for any signs of media in the
fuser or any signs of toner or other contamination. If a problem is
found, clean or remove the debris or contamination.