HP 2100 Service Manual - Page 91

Toner Cartridge Figure 5-7 Toner Cartridge Components The toner cartridge contains the cleaning, conditioning, and developing stages of the image formation process. These components of the image formation system that wear, degrade, or are consumed are built into the replaceable toner cartridge (see figure 5-7). This eliminates the need for a service call when replacement is required. Photosensitive Drum Figure 5-8 Photosensitive Drum The photosensitive drum is the heart of the image formation system. This drum's special properties allow an image to form on the drum's surface and then transfer to paper. The drum is an aluminum cylinder coated with an organic-photoconductive material (OPC) (see figure 5-8). The photosensitive drum's aluminum base is electrically connected to ground. The OPC material becomes electrically conductive when exposed to light. Areas not exposed to light remain nonconductive and maintain their negative charge. C4170-90959 Image Formation System 81