The charged toner particles are first transferred in an electric field to a drum coated with a photo semiconductor. When the photo semiconductor is exposed to light, a latent image, in other words, areas of varying charge, is produced on the drum surface. To transfer the toner particles to the drum, a magnetic brush is used to bring these particles as close as possible to the photo semiconductor. The toner particles of two-component toners are located on the larger particles of the magnetic powder sticking to the brush. The magnetic powder is not transferred. The process can be controlled in such a way that toner particles are conveyed exclusively either to the exposed or to the unexposed regions of the drum. This forms the visible powder image. The dry toner is then transferred to another, more highly charged drum – the transfer drum. The paper is guided between the two rollers such that the dry toner is deposited in a targeted manner, and the powder on the paper is typically fixed at high temperature and pressure, once again using the rollers. The finished printout is thus produced.
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