Lexmark X651de Service Manual page 281

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The Charge Roll places a uniform negative electrostatic charge on the surface of the drum. The drum surface

is made of a photoconductive material that holds an electrical charge as long as the drum remains in darkness.

Light striking the drum discharges the surface charge.

Photoconductive

Conductive Tube

The Printhead generates a beam of laser light. Image data received from the system card assembly modulates

this beam, turning it on and off according to image information that is received from the host computer and

Through the use of a series of rotating and stationary mirrors within the Printhead, the beam scans the

negative charged drum surface. Whenever the print controller sends a command to print a black pixel, the

laser switches on long enough to shine onto the drum at a single pixel point. That point is now discharged and

slightly less negative than the surrounding negative charge. The less negative areas are considered positive.

Drum Surface

Diagnostic aids

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Troubleshooting