Originally Posted by Hefemeister
Did this start after installing a new toner cartridge?
You may have a bad one.
No, we haven't changed any of the ink recently. The ink streaks happened totally out of the blue. The lady who uses the printer the most, was running her prints when all of the sudden they came out with dark streaks of ink across the paper. After realizing it, she cancelled the job and cleaned the printer and the cartridges off. It did make the streaks better, but they're still faintly there.
Today she told me that they slowly get dark over time, and when that happens she has to clean them out again. Not sure what that means. My best guess is some sort of build-up.