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Laser Printing consists of a six step process:

Cleaning is first done with a mechanical blade. The eraser lamps electro-statically clean
residual toner from the drum that the blade could not remove by neutralizing the drum surface with illumination.
Conditioning of the drum is done by the Primary Corona which places a universal negative 600 volts (-600 V) on the drum
Writing is done by a laser beam that is reflected off a mirror assembly. The voltage of the drum that the laser contacts is reduced by -100 volts. This area is referred to as the image.
Developing is when the toner which has an approximate -300 volt charge is attracted to the area of the drum that has a -100 volt charge. The toner particles acquire a negative charge (-200V to -500V) from the developer cylinder which is connected to a negative DC power supply.
Transfer of the image to the paper is performed by the transfer corona wire which places a positive charge onto the paper. The positively charged paper attracts the negatively charged toner from the EP drum. A static charge eliminator weakens the charge on the paper so that it may easily separate from the EP drum.
Fusing the toner to the paper is a two fold process. The fuser heats the toner which is composed of black plastic, thus melts the toner onto the paper. Secondly the paper is compressed between two rollers.