Lexmark W850n Service Manual page 178

4024-110
Transfer
As the paper travels between the Transfer Roll and the drum surface, the Transfer Roll applies a positive charge
to the back of the printing paper. This positive charge transfers the negative charged toner image from the drum
surface to the top surface of the paper. The toner image is now on the paper and the paper is now stuck to the
drum surface due to the relative electrical differences between the negative electrical charge of the inner
conductive layer of the drum and the positive electrical charge of the paper.
3-50
Printer Service Manual
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