Sharp AL-1216 Operation Manual page 41

(C) If the original does not move easily into the exit area, remove it in the
direction of the arrow while rotating the knob.
A number may appear in the display after a minus sign, indicating the
number of the originals that must be returned to the original feeder tray.
Clear the misfeed and return the required number of originals. Then
press the start ( ) key to resume copying.
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