HP 1200 Service Manual - Page 66

Image formation system Laser printing requires the interaction of several different technologies including electronics, optics, and electrophotographics to provide a printed page. Each process functions independently and must be coordinated with the other printer processes. Image formation consists of seven processes: Figure 18. CAUTION Image formation block diagram Toner cartridge As the focal point of the image formation system, the toner cartridge houses the cleaning, conditioning, and developing stages of the process. The toner cartridge contains the photosensitive drum primary charging roller, developing station, toner cavity, and cleaning station. By including these components (which wear, degrade, or are consumed) in the replaceable toner cartridge, the need for many service calls is eliminated. The special photosensitive properties of the drum form an image on the drum surface and then transfer the image to media. The printer toner cartridge does not include a light-blocking shutter. Do not expose the drum to light, which can permanently damage the drum. Protect the toner cartridge whenever removing it from the printer. 64 Chapter 4 - Operational overview EN