Paper feeds through straight at first then scans crooked at the end

Does this happen when you using the document feeder?? Try placing the original document on the big glass see what happens might be you document feeder needs to be adjusted or the original document is hitting a obstruction in the path as it is being scanned. Does it print OK? Vise copy?

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Adjust the feeding tray width to match the width of the paper.

When the paper does not feed straight, dirty or stickyrollers can cause it to jamb or crinkle, also failure to remove all traces ofpaper from a previous paper jamb will cause further paper jambs.
Check for tiny pieces of at the edges of the rollers, and remove these piecesof paper. The rollers may be dirty or sticky and causes the paper tonot feed straight.
Try cleaning the rollers with methylated spirits.

When the paper does not feed straight, dirty or stickyrollers can cause it to jamb or crinkle, also failure to remove all traces ofpaper from a previous paper jamb will cause further paper jambs.
Check for tiny pieces of at the edges of the rollers, and remove these piecesof paper. The rollers may be dirty or sticky and causes the paper tonot feed straight.
Try cleaning the rollers with methylated spirits.

This can be caused by several factors. It could be that there's something(like small foreign objects in the paper feed area) causing the paper to get crooked. It can also be caused by improperly adjusted paper guide or the paper is not in good condition.

Paper Feed Rollers Are Rolling But the Paper Is Not Feeding
How the Accu-feed Paper System Works

check to make sure there aren't little pieces of paper jammed at the ends of the roller. if you can pop out the roller easily you may find tiny pieces of paper still lodged in there

Push the copy button with the cover up and no paper on the glass. Is the light bar straight up and down, or is it crooked? I can't imagine how paper could go thru the machine crooked, but check it out if you can. If the paper is too thin, it may not be getting grabbed by the rollers right.

if paper comes out straight, and lines in paper are not straight then there is problem wit laser unit, its not installed corrrectly, also you can check drum unit and transfer belt for correct installation.

Make sure the paper aligning slides are tight to the sides of the paper. In the case that they are spring loaded make sure there is not something preventing them from holding the paper properly aligned.
The print head could be 'off-track'...
If the text is properly aligned on the edge of the page, but appears crooked it is related to the print head assembly. If the text is not aligning to the edge of the page then the paper is not feeding straight and the paper aligning slides are at fault.
It is also possible that one of the paper feed rollers are not grasping the paper and it is forcing it to one side as it pulls it in.

Are we talking about a paper feed problem from the paper cassette tray or the Auto Document feeder on the top. Either way, check the the paper width guides, or if it is the paper cassette tray, remove it and check the paper pick up roller locking clips.