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Three possibles for this.
1 A faulty cartridge dropping toner on the paper as it passes through the drum. - remove the toner cartridge and look for lots of loose toner in the drum. 2 The drum cylinder is dirty and needs to be cleaned with alcohol and a cotton ball. Toner can build up on the drum cylinder and also the cleaning brush inside the drum assembly. These would need to be cleaned - or replace the drum. And 3 progressively either or both of the above two may have lead to a build up of toner on the fuser at the back of the machine. In very bad cases the teflon type coating on the fuser may have peeled. If the fuser is dirty, it can be removed and cleaned. If it has become damaged - forget it, just buy a new machine.
You're right about the cartridge and I suppose cleaning it means all the toner that the generic cartridge dumped. Turn off the machine, take out the cartridge and use a vacuum cleaner and a soft brush to get that extra toner out. After that use a soft cloth (not terry) to wipe down the inside.
You either have a defective black toner, a bad fuser or transfer belt. From my experence it is usually a bad toner cartridge. After you print a couple of pages, pull the black toner and see if there is anything on the drum. If there is try shaking the toner, sometimes toner does like dirt and clogs up. If you still have problem you will have to try another toner. I know that is not cheep, but I don't know any other way.
The most likely problem is not with the drum unit but rather with the developer unit and there is a leakage current within the unit causing the 'ghosting' on the printed images.
I would suggest that you replace the developer unit within the system. It is quite possible that the waste toner blade is contaminated with debris from using non-OEM toner within the unit. Therefore leaving residual toner particles on the surface of the drum.
Try this solution and see if that corrects your problem. This solution can be applied to virtually any laser printer, copier or MFP device in the industry. The problem is nearly 99% of the time related to CHEAP toner cartridges that are refilled or refurbished and the company doing the work does NOT replace the cleaning blades within the units, and they use a generic polyester-resin toner that does not conform to manufacturer standards.
I worked as a Design Engineer for Kyocera-Mita America for nearly 6 years and have seen this problem many times in the industry. The price you save on using recycled cartridges ends up costing you more when you have to replace a developer or drum unit.
Sometimes what happens is the toner seeps onto and into places where only a vacuum and crevice tool and a brush will remove it. It will get anywhere and everywhere, and wind up on the strenghtning flanges, it can be tricky and frustraiting to remove all of it.
Persistance and a smaller vacuum will most likely be what will allow you to resolve it.
Also take a look at your toner cartridge and be sure it is not leaking. There is no use going through all that, only to have it come right back.