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The is blocked by dust on the side of the paper on the image unit that would have color associated with the print. Remove all the image units and clean all the laser glass. Replace those image units also if streaking as for the paper ensure correct paper side and media type.
take a q-tip and clean the scanner window. this is located in a 3/16' opening on the roof of the printer cavity it will be about 8inchs long. pull the toner cartridge and feel with your fingers on the roof of the cavity this will be located above the transfer roller slightly towards the front of the printer. white lines like this mean the laser is being blocked usually by a bit of toner or other dirt of some kind
Usually if there are streaks you need to change the pcu that is the same color as the lines. If the streaks are gray it also could be the fuser, but i would think it is the pcu.
Chances are you have a bad toner. The lines a spaced about the same width as the diameter of the drum on your blue toner. Shack the toner and try again. The toner may also be spilling toner into your printer.
this usually occurs when you print large volume of copies of documents that goes beyond the printable area of the paper, some powders stick in the roller of your printer hence making the gray streak.
you can check if the rollers have accumulated some powder, if so, have the rollers cleaned.
Need more info.... Is it pitch line accross the page the whole page or banding on the front or back side of the copies or is it black streaks down the page?
Check your Toner Carts. Is the line a certain color? Black perhaps?
Lift the door of the toner cart. If you see a streak on your toner drum, you will see a streak on your paperwork.
Look at your fuser as well. Is there a problem with the big orange roller? BEWARE! Don't touch the fuser roller its EXTREMELY HOT! Let the printer cool down before inspecting.
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