1 try printing from the adf feeder
2 try printing from the scanning glass
if from one of the above method has the problem try to clean your optics
if streaks comes from both u might have problem with the following parts
the charger unit- service it
the toner cartrigde- try a new one
the transfer roller - its is a black roller of it becomes white replacement is needed.
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It is either the toner cartridge or the fuser. Put paper in the manual feed tray. Print the Configuration Pages. When the sheet is half way fed into the printer, open the top cover. Remove the toner and look at the sheet of paper. If you see the black streak, the toner is bad. If the sheet looks good, the fuser is bad. Probably a bad roller, which you can see looking at the fuser.
Run a copy and shut the machine off when the copy is half way through. Open the machine up and remove the toner cartridge. Turn it over and slide open the flap that covers the drum. If you see toner streaks on the drum surface similar to what you see on the page you have a defective toner cartridge. Most likely the toner you bought is remanufactured as this machine is very old. Maybe you can return it for another.
The problem is that that there a small piece of glass that the doc feeder use's to scan the orginal. You will have to clean the small glass it's about a half of a inch piece and is normally under the doc feeder unit. It will either be to the right side of the main copy board glass or it is under the doc feed unit where the paper goes down through the feeder. It is mostly some white out on the glass, just clean with a dam cloth with water or windex..... Good Luck