Copy/Print Problem with Bizhub 501

[backspace]

The Machine counter is at 205K, I installed new Drum, Cleaning Blade and Developer. Now the user cannot get FULL tone of black colour, see the attached image.

Normal texts are printed without any problems but when you print something that has to have a full tone black square or as in this image its background and large sized letters that is what you get.

Has anybody had a similar problem, or have any ideas of what could be the cause of this?

I was thinking of replacing coronas, but still I would like to hear your opinion first.

[mo0651]

U can use a scotch brite pad and clean the transfer/sep wires and see if it improves the quality. Gently scrub back and forth to remove ozone build up.

[moonwalker3778]

replace charge and Transfer corona wires u ll get full tone.this is a common prob in this model