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The OPC drum is an important part of the printer and carries the toner or ink cartridge used by the printer. During the printing process, toner is gradually transferred to the paper through an OPC drum to form writing or images. The OPC drum also plays a role in transmitting image information. When the computer controls the printer to print through the print driver, the computer needs to convert the text and images to be printed into certain electronic signals, which are transmitted to the photosensitive drum through the printer and then converted into visible text or images.