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After rotating past the conditioning station, the drum has a uniform high negative charge on its surface. At the writing station, a sweeping laser beam is used to discharge this potential in selected areas by focusing laser light on selected portions of the photosensitive drum. This creates what is known as an electrostatic image. This image is later developed into a visible image. Portions of the drum not exposed to the laser still have a high negative charge.

In short the laser writes the image on the drum.

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