[Misc] BIZHUB C252P background problem

[Zilviux]

Hello I have this machine and the problem is that all prints came out with light desnity black color background and its seem like dirty. the same is on uncoated and coated paper.
I have try to change fusing unit and transfer belt, also all fours image units, but problem still here. Anyone knows where to look?

[albasoul06]

Gray background when printing internal test prints on every color ???
Replace Black Print Head

[Zilviux]

and where i can locate in the printer?

[Stirton.M]

Call a certified KM service tech near you. You'll only make things worse if for yourself if you do not know what you are doing, as is evident in your last question.