Her are somethings to try.
- Paper jam
- Bad toner cartridge or bad toner.
- Clean the corona wire (see the manual)
- Drum is wearing out and needs to be replaced.
Sometime a small piece of paper can get jammed in the toner cartridge roller and cause this type of problem.
Also, often this seen with after market toner cartridges or refilled cartridges. Poor quality or old toner will clump inside the cartridge roller wiper blade. Just like dirt under the wiper blade on an auto, it will leave streak on the toner roller that are transfered to the print drum.
Take a look at the toner cartridge first and inspect the long black roller. If the streaks are there then you need a new cartridge.
If no on the roller streaks try to clean the corona wires.
Also inspect the drum to see if has streak. Try wiping drum with soft tissue paper to see if it come off or is etched into drum.
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