This is very simple. Just replace Stripper pad and Pickup rollers. Also there are adjustment in stripper unit. Check the green circle knob and adjust in to move the stripper pad in different angle. You need to do this every several thousand copies to even the worn in this rubber pad. If you continously make copies without adjusting it, only one side of stripper pad will be worn out and it will repeatedly make double feed and eventually cause jamming.

Replace the stripper base, pad and metal cover. www.image-parts.com has the best stock I have seen yet. "Stripper Pad 3750" 019-11933 is the clear type pad, and the "Stripper sheet: Green" 019-11731 is the type that does not need the cover. I don't know how the uncoated or "(Shrt)" are. I recommend the base 019-11733 and cover 019-11734 with the 019-11933 clear as it has lasted for 10 years on those part combinations and about 250K prints.

I have a riso too diff model though,,im not sure if yours have the 'stripping pad'.if yes try to rub it with an eraser and see what happens.it is the rubber thing that sandwiches the paper and the rubber wheels..it wears out or it smoothens in time especially when running 'rough' papers..replace if necesary

Need to clean or change the tires that pick up and seperate hte paper in the paper tray