XEROX 6204 Wide Format Printer

I have a Xerox 6204 Wide Format and when i print a set of drawing the first page will come out fine but after the first page the following pages will have dark areas. Looking at the paper it appears to be coming off of a roller because it has a continous pattern. The more you print the darker it gets. I have checked the drum and it is clean. Any ideas on a soluting to this would be great.