Xerox C60 expel toner

[xXFlipPTXx]

Hi everyone,
i'm facing some kinda of pratical bug while i'm printing on Xerox C60, i've notice that on top of the black drum some black toner over it as you can see at the photo.
Sometimes also expels to the glass over the black drum which i need to clean somehow, otherwise it will affect the print (some white parts).
Anyone faced this kind of problem? How can i avoid this?
Thanks.
IMG_20250514_094614.jpg

[printthatmanual]

either your drum or developer cartridge is bad, its most likely the seal on the dev unit, if its spilling from the top. I would replace both the black drum and k dev cartridge, just dont forget to set the atc barcode located at the bottom of the dev cartridge in service mode and you will also need to refill it with new developer powder. (if you have some spare dev units laying around you can try replacing the lid of the cartridge, its most likley bearing seals that are leaking though or just a bad roller)

[xXFlipPTXx]

I presume its likely the seal...but i changed once for a new one cause same effect...