Repeating marks are typically caused by a consumable, the distance of the marks determine which consumable maybe causing the issue. I would suggest that you either call into the support center so they can help you or try going to our online knowledge link to trouble shoot the distance.
Thanks, TammyL-Xerox Community Manager
Be sure to click Kudos for those who have helped you. Select Accept as Solution for posts that have helped to solve your issue(s)!
When we print on our Xerox we sometimes get these marks at the top of the page, they occur more often and more strongly if we have not printed anything for a while. They only occur on the top ~10% of the page, below that is always fine.
Sometimes they are all one colour (either black, cyan, yellow, or magenta), sometimes there are multiple colours on the page. The marks occur whether printing in B&W or in colour (the example below was printed in B&W).