1.try stopping the printer halfway thru a print cycle if you can stop a paper under the print cartridge and before the fuser you can check for print defects on the page before the toner is melted into the paper.
if no defects are found then your fuser may be defective,usually the upper fusers film sleeve tears -testing this way can save you from trying a new cartridge$$$
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All laserjet printers and laserject function on the same basic principles and unwanted marks, streaks, line etc, which are repeated in a pattern are mostly due to the deterioration of the cartridge parts(photoconductor and PCR roller mainly). The problem can be fixed by correctly identifying the faulty part and replacing it. This saves the cost of buying a new toner. However, sometimes cleaning the visible inside of the printer and cartridge roller greatly helps, which can be easily done using dry lint-free cloth and gently cleaning the photoconductor etc. Good Luck!
hi this may be the toner roller or supply drum for the toner cartridge . if it scratched or worn it leaves marks on the drum or the roller, which in turn fills with toner and leaves an imprint on the page, you can check these , just remove the toner cartridge and look at the green roller and also look at the black roller, it might be a simple case of changing it or cleaning it....hope this helps
This is probably due to a defective cartridge, Charge Roller or Transfer roller.
Check the cartridge for a band of toner still on the drum.
Check the Charge roller for oil or smudges, this roller should be a lighter color and should be relatively free of toner or marks.
Same as the Transfer Roll, which will be dark, though excess toner should be evident.
A relatively smooth straight line is generally the cartridge.
A rather wavey or broken line is most likely the rollers.
You can however attempt to print a large amount of pages (25-50) in an attempt to clean the parts, however if either part is defective they will need to be replaced and no manner of printing will clean them.