Konica Minolta c454 Black Prints

[mearmi]

Konica Minolta Bizhub C454e

Getting black prints. Sometime it works fine.
replaced Drum Developer K and Transfer Belt.

noticed 1 thing transfer roller is always full of toner.

please find the attached prints.

Thanks and Regards,

mearmi

[tsbservice]

i have had something similar and it was PH unit(laser).