Black almost gone on Xerox 242

Hi

After replacing the the following: black developer housing, black developer, 2nd btr roller assembly, IBT belt & cleaner, our black ink pretty much stopped printing. The entire point was to get rid of lines (you will still see them on the gray part). The lines are still there but that gray area was set to print 100% black, the other darker block is set as 100% each color (cmyk). After close inspection, we found out that the black drum does not get enough black toner, just very little and because of that it produces this grayish block instead of black.

Any help will be greatly appreciated to get the black color back and possibly get rid of the lines that go across the page. The lines happened only if the black color is printing on the sheet, they do not happened on the any other colors.

 

Did you replace the black developer housing or did you only replace the developer in the old developer housing?

If you put a piece of tape carefully over the inlet of the developer housing and then let it print two or three prints, is new toner being delivered to the developer housing?

 

we have changed both, the developer housing and the powder. Yes the toner gets dropped in the developer. I even put quite a bit of toner into the housing manually but nothing got changed on the printing side .

 

Voltage bias on black developer assy is not at normal specification. Too low voltage.
Possibly HVPS malfunction.

 

Any suggestion on how that can be fixed? A step by step will be great. Thank you!

 

To do this you need service manual and have some skils with electric measurments or call a tech

 

I have the same problem, there is toner blockage going into the developer housing. Do I need to replace the developer housing to fix this problem?