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First tray printing a black and white copy to see if you get same quality problem then try each individual color. If it shows on each copy then check The transfer belt Assy . If it only shows on one color then would be a drum unit or could be toner on laser shield glass . Other thing stop it during copying process and see where it's coming from look at drums and see if that shows up on them
Only in copy?????
I think your not telling averything. Print something and see if the problem is the same.
If so you problaby have registration out of the place. Somethmes in this model break a peace that is part of the registration. Im talking about one of this: rear or front bushing.
If you dont have tecnical training i advise you to call tecnition
if it is copied on long or legal size of paper are the fine lines on top to bottom or left to right? if it id from top to bottom check for the charge roller, clean an dry it with a cloth, wet with alcohol or water. if from left to right on a legal size of paper check for any vibration coming from the developing unit, like loose gears.
possibly the process unit and if you look in through the right hand door you can see the drum ...or it could come from a worn out upper heat roller.
all the best
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