Ricoh Priport DX3240 duplicator - Ink marks on back of page

[Duranis]

Probably a long shot but does anyone know what to look for on this? Basically it is printing black marks on the back of the page. I have cleaned the main pressure roller which is where the ink is getting and being transferred to the paper but then after about 20 prints the roller gets ink on it again and starts leaving marks.

 

Not sure how the ink is getting down to the roller, guessing the drum is making contact with it after the paper goes through and gradually building up a spot of ink on it.

 

I have tried different combinations of ink speed and density but not sure what else to look at.

 

Any ideas?

[Duranis]

On the off chance anyone in the future ever runs into the same problem and finds their way here I think I have solved it.

 

If you remove the drum and look at the cut edge of the master sheet you will probably see two ink marks on it. Lift up the sheet and there are two small round recesses. This had just got gunked up with ink over time and was transferring ink to the edge of the master sheet. This was then making contact with the pressure roller once the paper had cleared which meant the next sheet through was getting ink on the back of the page.

 

Cleaned these out and cleaned off the pressure roller and it all seems to be working fine again now.