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if you have not replaced the image drum (fuser) after three or four toner replacement changes, you will need to replace the fuser assembly to avoid unwanted lines and grainy or faded prints.
it is also a good idea to replace the rollers as well, if they have not been replaced either
RM1-2763-020CN fuser assembly worth about $200 with exchange of your old fuser
Usually that means you need to replace either the image drum or some of the smaller parts to fix this. If it seems to fade out more as you print more pages but comes back the next day when its cold then you may need to price out a drum or corona wire. The fix is just replacing the part which is about the same as replacing an toner drum BUT you need to make sure the parts cost isn't more than the printer is worth.
The problem is that the revolving drum doesn't contact the OPC drum proberly. You have to open the left side off the machine and replace the little white gear on the shaft that drive revolving drum. The gear has "jumped"one step and the revolving drum isn't parallell to the OPC drum. I fixed my 2840 last night it takes some time but now it works perfect.
There are two possible solutions to this common problem.
1) The Cyan cartridge may not be in 100% of the way. If the handle of the Cyan cartridge prutrudes even slightly, it can obstruct the printhead for the black developer. Remove and reinstall the Cyan cartridge and test.
2) The printhead is dirty, with some toner spillage on the printhead. All new imaging drums also include a new cleaning pad for the cleaning wand.
The cleaning wand is designed to clean toner off of the printhead. you can see this in your printer manual, but basically, just open the front cover, pull the the blue handle on the right side forward ( this opens the access cover for the cleaning wand on the right side of the printer ).
gently pull the cleaning wand out ALL THE WAY, then slide it back in ALL THE WAY. do this several times.
The cleaning wand is intended to travel across the print head in only one direction, which is why you should make sure that it is pulled all the way out.
One of these two solutions should fix your problem. If the problem is resolved, but then reappears after a short time, then you have a defective developer that is leaking toner on the print head. The color of the defective developer can be determined by the color of the cleaning pad after cleaning the printhead as discribed above.