Sharp DX-310 jam in ByPass Tray

[Jack79]

Hello
I am not technician. I am learning myself how to repair mfp printers.
I have Sharp DX-C310 which show misfeed when printing from manual feed tray. It drags the paper in 80-90% (picture 1).
Removed paper is curled (picture 2)
JAM code is MFT.
What should I check to find what cause jamming?

p1.JPGp2.JPGp3.jpgp4.jpg

Thanks
Jack