konica bizzhub 1050,backround

[dion]

Hi! Im having trouble with a 1050bizzhub.The machine printing a strength backround in all area of paper.
I replaced before 4k copies drum,developer,charging wire and grid
Yesterday i replaced the corona unit with another and also the dev.unit,but nothing changed!!!!!

[allan]

post a sample. Check your charge, drum earth and developer bias.