Remove the old drum unit,remove the drum and the drum cleaning blade,clean the charge corona wire and grid,install the new drum and drum cleaning blade,clean the image transfer /separator corona wire,clean the optical parts(mirrors ,lens,glass)clean the AIDC sensoe located under OPC drum,reinstall the drum unit in the copier,enter in the technical Rep mode,place 5 sheets A3 paper on the original glass and perform F5 AIDC sensor(Auto image density control).
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