Auto feeder not copying the entire page

i assume the sheet is going through the feeder properly and not sticking?

you may need to go into the crop codes think it is the C button and the lighten button (2nd in from left) C first then lighten and repeat (C,L,C,L) - the lights should go out use the up down arrows to select the adjust code enter 50 and hit the start button then enter 16 adjust the value and then do a copy see if better or worse & adjust accordingly you are adjusting the SPF mode document off
center adjustment hope this helps P.S this is one of the cheapest sharp copiers! so don't expect too much - spend more!