Final answer:
The drum of a laser printer is typically charged to a voltage of several hundred to a few thousand volts. This charge is adjusted by a laser to create a positive image which attracts negatively charged toner. The final image is then transferred onto paper and fused with heat.
Step-by-step explanation:
During the charging process of a laser printer, a conditioning roller is used to apply an electrical charge to the surface of a photoconductive drum. The exact voltage can vary between models, but typically, the drum is charged to a voltage in the range of several hundred to a few thousand volts. This initial charge is then selectively discharged in patterns by a laser beam to create a positive charge image, reflecting the content that is to be printed. Following this, toner with a negative charge is attracted to the positive regions of the drum. The paper is then given an even greater positive charge, which pulls the negatively charged toner from the drum. Finally, the toner is fused onto the paper using heated pressure rollers, resulting in a high-quality printed image.