SecretSquirrel wrote:Drum. To much toner is always the drum. The drum is electrically charged (positive I believe) and the laser prints a negative charge on the surface. The toner has the same charge as the unexposed drum and so only sticks where the laser exposed it. This is then transfered to the paper by pressure contact. All the fuser does is melt the toner into the paper. It doesn't add or remove toner. If the image is correct on the paper but smears or flakes off, then you have a fuser problem. The problem you describe can be caused by wear on the print drum, a light leak that is exposing the drum, or probably some other things I no longer remember.
Most printers these days include the print drum in the toner cartridge, but some older printers didn't. The drum was a seperate replacable item, mainly because it was really expensive. Don't remember how the 4L is laid out. I haven't worked on one since the mid 90s.
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