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Run a half test. Put paper in the manual feed tray. Print something, anything When the paper is 1/2 way into the printer, open the cover. Pull out the toner cartridge. Look down at the paper. Does it have a black line on the right side? If yes, replace the cartridge. If no, replace the fuser.
A) Black Streaks, Shadows, And Ghosting Adjust the printer's lightness/darkness setting to 2-3 different variables and see if problem disappears.
Look at the fusing assembly - is the roller torn or does it have any black buildup? Use caution!!! It gets HOT!
Look in the Reference Guide. This should come with your copier if you bought it new. Do you have Finisher J1 (internal finisher, paper comes out above paper trays) or the SaddleFinisher and inner2way tray (paper comes out on left hand side of machine).
For finisher J1 look starting on page 7-38. Saddle Finisher 7-61.
Can get Reference and Copy guides here:
The English versions (which I use, I don't speak Italian) are the ones with ENG in the name.
Most likely something on the glass. Even a small speck on the glass will cause a horizontal line across the sheet while using the top feeder. Otherwise it would be the drum unit or a scratched fixing film.
Most likely your drum unit is worn out. If it reaches the yield of 50k or more, it starts to develop grooves in the drum and toner gets stuck in the groove and is applied to your pages. If you have a service company, they can change it for you. We sell the drum for $220.