Charge; Exposure - Dell 5230dn Mono Laser Printer Service Manual

Service manual
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Charge

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
Surface
Conductive Tube

Exposure

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
software.
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.
Charge roll
(-VDC)
DRUM
Ground
HVPS
(-VDC)
Ground
Drum Surface
Drum Surface
Image
Voltage
0V
-VDC value
3-79
Diagnostic aids

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