IR6570 image void

[Dedotch]

I have 2 ir6570s that print great single sided. When they duplex there is a small void on the tail edge. Only about a line of type wide, it moves up and down the sheet. (not uniform). Sometimes it is 2" from the top sometimes in the middle. Always on the trail edge. I have increased trans voltage strung new wire. I think it is happening at paper transfer not drum charge, but I am not sure. Only on letter, not on LR or 14 or 17" paper. Thanks for your help.

[charm5496]

sounds like moisture in the paper and when it goes through for the second side your paper is wavy causing the void areas

[Canuck]

I would start with pressure roll and bearings. They only last about 250k on this machine and can cause a ripple in paper first time through. Do a nip check. Or you could have something putting a bump on edge when doing reversal for second side. Remember lead edge first side is trail edge second side

[Joesaima7749]

Try and clean the corona wire. transfer, pre-transfer and primary. because these symptoms may be caused by dirty

Good luck