Dell 3010CN Service Manual page 542

The laser beam is radiated according to the printing data (image data) output from the printer
controller. The laser beam is output only when printing data is pixels (micro points composing
characters or pictures). (The laser diode lights up for parts to be developed by toner, and not
for parts that are not to be developed.)
The drum surface radiated by the laser beam becomes a conductor, and the negative charge on
the drum surface flows to the positive side and the charges negate each other so that the
potential on the drum surface drops. The part on the surface where potential drops becomes
the electrostatic latent image.
Photoconductor
Conductor
(Laser beam)
ROS ASSY
<Concept of drum>
Laser beam
Photoconductor
Conductor
: Negative charge
: Positive charge
Drum
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Electrostatic
latent image
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6 - 5
Chapter 6 Principle s of O peration
Drum surface
(Laser beam)
Electrostatic
latent image
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Potential on
drum surface
(Laser beam)
-V
0
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