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Photosensitive Drum
The photosensitive drum is the “heart” of the Image Formation
System. The special properties of this drum allow an image to be
formed on the drum’s surface and then transferred to paper. The
drum is an extruded aluminum cylinder. The outside of the
cylinder is coated with a layer of organic-photoconductive
material (OPC) which is non-toxic. The aluminum base of the
photosensitive drum is electrically connected to ground potential
(see Figure 5-7).
Drum Sensitivity
The OPC material has properties similar to a photo-resistor. It
becomes electrically conductive when exposed to light. When the
photosensitive drum is exposed to light, the negative charges
deposited on it are conducted to the ground potential of the
drum’s base. Areas not exposed to light remain nonconductive
and maintain their negative charge.
Caution
Do not expose the Toner Cartridge to any bright
light source. Too much light permanently
damages the drum.
Figure 5-7 Photosensitive Drum
Functional Overview 5-17