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HP has a cleaning page that can be created to help remove toner build up on the fuser roller and I believe one for the drum also. Print "Menu Map" to find the cleaning page quickly. These are the two areas that need to be cleaned to help eliminate the "scumming". I would also look inside the device after removing the print/toner cartridge and if you have the toner wipes, remove any toner spillage inside. please do not use paper towels as they shred too easily and will mess up the transfer roller.
someone cheaped out and got the el cheapo paper. The low quality paper has paper dust on every page.... when the printer feeds this cheap paper thru the machine it drops the dust onto the tonor cartridge rollers and causes the roller to accumulate toner on the roller... this in turn is transfered to the pages being printed. check your machines operation manual. There may be a clean cycle you can try to run to clean the rollers... I had to buy a new toner cartridge for mine when this happened.
If the toner is loose, and you can smudge it with your fingers, then it is a fuser error. The fuser is the hot roller at the back that melts the toner onto the page.
If the toner is not loose but the page just has a kind of grey dusty background which cannot be rubbed off with your finger then the problem could be a dirty transfer roller or a dirty cartridge. It could also be dirt in the optics if it is used in a dusty environment. Cleaning the lenses with a clean dry cloth should clear that up.
This is a sign of a worn or faulty toner drum or a dirty fuser roller.
Clean the fuser roller, switch the laser off and let it cool down first and clean the fuser roller with a cloth with a some white spirit. If the fuser roller is clean the the toner cartridge needs to be replaced (it contains the photo drum).
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.
This is the test to determine toner or fuser issue. Print a test page When you hear the paper feed into the machine open the top to stop the machine Remove the toner cart. You should be able to see the page with printing on it. (This is before the page hits the fuser) If you can see the smudge or marks on the page the problem is most likely the cartridge or cleaning roller but NOT the fuser. If the page is clean the problem is most likely the fuser.
First try changing out the toner cartridges since it is the cheapest option. If this doesn't work check the fuser unit by opening the back door and see if there is a line worn down the miidle. One other option may be the transfer roller that sits under the toner cartridge. It may be worn.
try to clean the printer from smeared tonner and the transfer.
the grey print could be as a result of printing using application sofware. make sure the tonner economy mode is not active form the application software,if it was turn it off and save, then reprint.
There are several things that can cause this. A worn toner cartridge and/or transfer roller can cause vertical smears, but it may also be a worn fuser assembly. The teflon coating on the fixing (heat) roller wears off, and leaves vertical streaks of varying widths on the pages. Sometimes you may see "ghost" images on the pages for the same reason. Open the back door of the printer, and hold down the exit guide on the fuser (carefull, it may be very hot). There are two long rollers, the lower one is black, the upper roller is either grey or shiny brown. That's the teflon coating. See if it's peeled or damaged. If so, replace the fuser assembly.