Printhead Unit (Exposure Section); Imaging Cartridge (Charging/Development Section) - Lexmark Optra W810 Service Manual

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Printhead Unit (Exposure section)

The printhead unit incorporates a laser diode that emits a laser
beam corresponding to the print image data.
The scanning laser beam scans the PC drum from left to right,
producing an electrostatic latent image on the surface of the PC
drum.
Imaging Cartridge (Charging/Development
Section)
The printer main body I/C drive motor (M1) transmits power to the
gears of the imaging cartridge. The I/C drive motor (M1) turns
clockwise (as viewed from the front of the printer).
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Service Manual