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The imaging drum is charged with a high negative voltage (between -500 and -1,000 VDC ) with a primary charge roller. In older laser printers, a corona wire applied the high negative voltage instead of a primary charge roller.
An imaging drum is a round rotating cylinder covered with a photosensitive surface. Images are written onto the drum by shining a focused light from the laser onto the drum. Laser printers have a drum. A primary charge roller (or in some cases a corona wire) applies between -500 and -1,000 VDC to the imaging drum. This charge neutralizes the photosensitive surface of the drum and prepares it to receive an image. A highly focused laser shines light onto the imaging drum through one or more mirrors.