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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.
Coating 2. The print image must be inscribed on the drum first in order to transfer it to paper, and the drum's coating makes it receptive to light. Most laser printer drums are coated with selenium. Selenium is a nonmetallic element with photovoltaic and photo-conductive properties that make it ideal for this use.