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Are the streaks horisontal or vertical on the page? What printer? Laser or InkJet? If laser, and streaks are vertical, you might have some dirt stuck in teh tomer cartradge or somewhere along the paper path If laser, and streraks are horisontal, your toner cartridge might be dirty or leaking toner
black streaks the toner cartridge is leaking from the left side which is easy to check pull the tone and look at the gears on the left side to see if toner is present. if these gears have toner on them the cartridge is leaking replace it. check the fuser for wear marks on the hot roller which is the top roller when these get worn through the outer coating they will create black streaks
If you can rub the toner off the paper it is the fuser.
fuser, the part of a laser printer that melts the toner onto the
medium. It consists of a hot roller and a back-up roller. After toner
is transferred to the paper, the fuser applies heat and pressure to
ensure that the toner stays on the paper permanently. This is why
paper is warm when it comes out of a laser printer.
For toner problem:
Do a half test as follows -
Print one sheet from the fold down tray, just as the trailing edge of the paper
goes into the printer open the toner door to stop the printer. Remove the toner
cartridge, are the marks on the paper that you can see in the printer? If they
are there the cartridge needs replacing.