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As an important Laser Printer Component, Drum Unit functions in order to attract the toner by the help of electrostatic attraction. After it is fully charged, images are being painted on its surface by the support of printer's laser. Later on, the drum unit induces the process through which the letters are painted on the toner for various printing purposes. In short, Drum Units helps in transferring the toner into an image through a drum, finally the paper is there to pick that up. The Drum is subjected to complete positive charge through the help of charged corona wire. After that, the drum starts revolving and the printer throws a small laser beam around the surface in order to discharge respective points. This is how, the laser draws the images and letters that are to be printed as a serial pattern of electric charges, known as electrostatic image.