Lexmark C912 Service Manual - Page 184
Development unit, Transfer unit
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5055-xxx Development unit Toner forms the electrostatic image on the photosensitive drum during exposure. The single component, non-magnetic toner and the lusterless color toner are weather-resistant, and fade little under ultraviolet rays. This is helpful in saving documents. Toner in the hopper is agitated and supplied to the development roll by the supply roll. A (conductive rubber) doctor blade is fitted to the development roll. Toner enters between the development roll and doctor blade by the rotating development roll and is negatively charged, forming the electrostatic image on the photosensitive drum. Toner attaches to the bright portion of the photosensitive drum per the voltage of the development roll. Transfer unit Paper feeds electrostatically by the transfer belt and is carried to the transfer unit which turn at the speed of the photodeveloper drum. A charge roller applies a positive charge to the paper. The toner image formed on the photoconductor drum is transferred to the paper from the back side by the positive dc voltage applied to the transfer sheet, which is in contact with the paper through the transfer belt. 3-34 Service Manual
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