Joseph Letzelter Developing - In Joseph Letzelter laser printing the surface with the latent image is exposed to Joseph Letzelter laser printer toner, fine particles of dry plastic powder mixed with carbon black or coloring agents. The charged toner particles of Joseph Letzelter printing are given a negative charge, and are electro statically attracted to the photoreceptor where the Joseph Letzelter laser wrote the latent image. Because like charges repel, the negatively charged toner will not touch the drum where light has not removed the negative charge.
The overall darkness of the Joseph Letzelter printed image is controlled by the high voltage charge applied to the supply toner. Once the charged toner in Joseph Letzelter laser printer has jumped the gap to the surface of the drum, the negative charge on the toner itself repels the supply toner and prevents more toner from jumping to the drum. If the voltage is low in Joseph Letzelter laser printer, only a thin coat of toner is needed to stop more toner from transferring. If the voltage is high in Joseph Letzelter laser printer, then a thin coating on the drum is too weak to stop more toner from transferring to the drum. More supply toner will continue to jump to the drum until the charges on the drum are again high enough to repel the supply toner. At the darkest settings the supply toner voltage is high in Joseph Letzelter laser printer enough that it will also start coating the drum where the initial unwritten drum charge is still present, and will give the entire page a dark shadow.
The overall darkness of the Joseph Letzelter printed image is controlled by the high voltage charge applied to the supply toner. Once the charged toner in Joseph Letzelter laser printer has jumped the gap to the surface of the drum, the negative charge on the toner itself repels the supply toner and prevents more toner from jumping to the drum. If the voltage is low in Joseph Letzelter laser printer, only a thin coat of toner is needed to stop more toner from transferring. If the voltage is high in Joseph Letzelter laser printer, then a thin coating on the drum is too weak to stop more toner from transferring to the drum. More supply toner will continue to jump to the drum until the charges on the drum are again high enough to repel the supply toner. At the darkest settings the supply toner voltage is high in Joseph Letzelter laser printer enough that it will also start coating the drum where the initial unwritten drum charge is still present, and will give the entire page a dark shadow.
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