[Misc] Minolta Di 7210 - dirty edges of paper

[svety]

The copier is Minolta Di 7210.

The problem: dirty (stained) edges of paper - something like dots, small lines near to the ends of paper.

Someone to help?

[fixthecopier]

It would help to know how old the parts are. My first guess would be the charge section, grid and wires. You could also have a blade going bad.