So I removed the black drum and spon the developer unit and seems to be fine, hard to tell with all the developer stuff on it. The weird thing is I put in another (used) black drum from the shelf and some how the marks are now at the top of the sheet but the exact same distance as before....???
Ok thanks, that sits directly next to the drum correct? Is there any methods to cleaning or vacuuming it off to try to fix issue or do you think it needs to be replaced? We don't have a service contract so I'm trying to figure it out so maybe I can fix this issue.
Could be from black developer housing.
Thanks for your reply. It measures just under an inch & 1/2. Looks like 1 7/16.
Measure the distance between marks please.