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For understand the issue, little bit technical knowledge required: Take half test page, check how much dark image formed on paper, check on cartridge drum how much dark image created?..(half test page: while printing half of the page switch off the printer, take cartridge out as well as take half printed page)If half page print quality is good on paper: Fuser faulty(teflon sleeve)If half test page print not good & image on drum is OK: Fault with Transfer roller or its bios voltage contacts..If there is proper image on paper & image drum: Problem with laser scanner assembly..find the problem, then remedy is easy..
If it is only causing an image problem when you copy and not when you print, then there is something wrong with the optics under the glass. Check and see if you have any mirrors out of place or if the scanner looks crooked. If you have the machine set up to scan try and scan to SMB or email to see if it still has the problem. If everything looks correct under the glass and scans to SMB and email look bad like the copies, you may have a bad CCD assembly, or a bad board.
How old is the printer? try to go to the print options and do a realignment of the print heads. if its an old printer possible might need to clean the print head if that didnt work maybe bad print head.... take it to the pro. good luck!
Is there any chance you can post a scan of one of your faulty pages. This would help to assess the fault.
If you print several pages, does the image move further and further down the page with each copy?
Is the white band repeated down the page? If so measure the distance between each band - this will help identify the faulty component.