If it occurs when you make an internal print like printing a status page then call a tech... if it occurs from the document feeder and/or from the glass table.. then look for black marks, white out, ink, staples or paper on either one... these can show up as black lines... when you are making copies... you can generally chip away at them with your nails or a flathead screwdriver... be gently or you could scratch the glass...
I’m happy to assist further over the phone at https://www.6ya.com/expert/norman_d2fa496dce30c65d
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