30 seconds with Google Search. You could have found it and not had to sit there waiting fomr someone else to do the deed.
http://en.allexperts.com/q/Repairing-Copiers-Faxes-1748/f/Sharp-AL-1631-H4.htm
http://www.printcopy.info/?l=en&mod=free&chap=erc&brand=Sharp&model=AL1642CS&code=H4-00
https://www.youtube.com/watch?v=F-EfeEumpoU
XX, March 2015