Laser Printer Process
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Cleaning and erasing
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A rubber blade clears the excess toner from the drum. Another roller or corona wire removes the charges from the drum.
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Charging or conditioning
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The primary charge roller (in newer laser printers) or primary corona wire (in older laser printers) applies a negative charge of approximately -600 volts to the EP drum.
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Writing or exposing
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The laser beam reduces the negative charge to about -100 volts on the EP drum in the areas that become the image to be printed.
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Developing
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Areas of the drum that were written to by the laser attract toner.
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Transferring
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A positive charge of about + 600 volts is applied to the paper by the transfer charging roller or corona wire.
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Fusing
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Pressure and heat set the toner to the paper. A 350°F fusing roller melts the toner, and by squeezing the paper through a set of rollers, presses the toner into the paper.
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Step 1
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Cleaning and Erasing
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Step 2
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Charging or Conditioning
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Step 3
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Writing or Exposing
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Step 4
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Developing
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Step 5
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Transferring
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Step 6
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Fusing
