Lexmark W820 Service Manual page 76

4025-XXX
The toner adhering to the Magnet Roll is always in contact with the drum surface.
When a less negative point on the drum (a discharged area) comes in contact with
the more negative charged toner on the Magnet Roll, toner transfers from the
Magnet Roll to that point on the drum. There is now a visible toner image on the
drum surface. The image is called a developed image.
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Service Manual