Xerox Docucolor 250 Black printing very light and faded

[bryant28282000]

I have a Xerox Docucolor 250 that is printing the black light and faded. Here is what i replace so far too no avail:
Black developer and housing
Black laser unit
HV powersupply
2nd Btr
Transfer belt and assy
Developer Drawer
Drum
Fuser Tray
Is there anything that i miss?

[InterfaceP]

Re: Xerox Docucolor 250 Black printing very light and faded

Developer Bias (K) HVPS and the 1st BTR.

[Exok]

Re: Xerox Docucolor 250 Black printing very light and faded

Slide out and remove the drum / DV tray. You will also want to remove the transfer assembly so you have more room to work with. On the inner back frame of the machine there are contacts that meet up with the drums and developer units electrically. You probably have one of these contacts that is either dirty or bent and not making proper contact with either the black drum unit or black developer unit (such as the black developer housing bias voltage contact).