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If you 'replaced' or refitted the original cartridge, then I would suggest that the toner cartridge has failed. If this is the case, please try a new one.
If the original has not done a fair (check manufacturers specification) number of prints, you may be able to ask for a replacement.
If this was a new cartridge, and printer uses separate drums and toner cartridges. Then it could be a faulty drum. Above replacement path could be tried.
If they are smudged and the toner is set when the print comes out, there is something catching on the paper before the heated roller. If the toner smudges after the print comes out there is a fault with the heater and it is not setting the toner.
This means the machine is over-toning ie using more toner than required caused by either improper toner or different brand of toner. The correct toner is sf 222T1. Replace developer and use the right toner and clean the drum and its blade. You may need to clean fuser rollers for cleaner copies.
is the shadow off set from the original image?
if so it could be the cleaning unit for the fuser (heater) may have to be changed. If the cleaner does not clean the fuser rollers a residual image will be passed onto the page.
There are several reasons, all of which will require a technician. Do you mean the toner will wipe of page (unfused)? This is the Fusing pressure roller. Do you mean smudge marks that don't wipe off? This is most likely either a drum (photoconductor) problem, or the Upper fuser roller - could possibly be dirty optics as well. But like I say, only a technician can help you here.
Hi, try to pull out complete process unit(cartridge) with toner box .You have cleaner(blue or green color) move this cleaner from right to left side 4 or 5 times.Note that cleaner MUST be in home position-right side when you finish.Check print.
If problem still persists, you must do following:take away small grey plastic cap on left side of cartridge,then push complete charge corona(part with cleaner on top of it) to left side just enough to lift right side of corona from cartridge.Pull out that corona and you can see drum and developer roller. Turn the gear on drum,and look for smudges on black developer roller.Try to clean smudges with brush or with dry cloth.Toner will again attract to that area,but regular.