Konica Minolta dirty copies

REPLACE THE DRUM UNIT/IMAGE UNIT TONER WILL NOT FIX THAT PROBLEM for Black

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Sir, what color has the problem? I don't understand you question? Are you using OEM parts. Have you had qualified Konica Minolta technician look at it?

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The corona housing for the back drum need to be replaced. Get a new black image unit drum and developer units

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what errors P??? or C????

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replace the black image unit and run gradation test

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"Dirty" could be one of 3 things... Transfer belt, Imaging unit and fuser unit. Make 5 copies in jam the machine by opening a cover. remove pages and see where the "dirt" originates from.

P6 : cyan image unit problem. P21 come after P6, and it's also too a cyan unit image problem. replace the cyan image unit.

replace the black image unit and clean sensors under the transfer belt

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write unit block the signal just try to look for the object that block the signal from write unit

If the message Change Imaging Unit Magenta displayed refer to imaging unit with contents a developer.The Imaging unit life is 80.000 copies.
The imaging units located after front door when is located the waste toner box.
If the message M toner end/change the M toner displayed refer to toner cartridge
The toner cartridge life 15.000 copies 5% saturation.In full color mode the color saturation is 80% and the color toner life is 6.000-8.000 copies.
I think your problems is a toner not the developer.