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The imaging drum is charged with a high negative voltage (between -500 and -1,000 VDC ) with a primary charge roller. In older laser printers, a corona wire applied the high negative voltage instead of a primary charge roller.
An electrostatic charge of â600 volts is uniformly distributed over the surface of the drum by a corona discharge from a corona unit (Corotron), with output limited by a control grid or screen. This effect can also be achieved with the use of a contact roller with a charge applied to it.