Savin SDC103A Service Manual download pdf (Page 134)

100

101

LASER EXPOSURE

5.1 OVERVIEW

A: Laser Diode Unit E: Laser Synchronization Detector Board-1

B: F-theta Lenses F: Laser Synchronization Detector Board-2

C: Barrel Toroidal Lens (BTL) G: Polygon Mirror Motor

D: Drum Mirror H: Cylindrical Lens

I: OPC Drum J: Shield Glass

This machine uses a laser diode to produce electrostatic images on an OPC

drum [I]. The laser diode unit converts image data from the printer main

board into laser pulses, and the optical components direct these pulses to

the drum.

There are 16 gradations for each pixel using the laser pulses, controlled

through power modulation and pulse width modulation. However, to produce

a high quality copy image, dithering during image processing results in a

possible 256 gradations for each color for each 4 x 4 pixel unit.

Exposure of the drum by the laser beam creates the latent image. The laser

beam makes the main scan while drum rotation controls the sub scan.

The intensity of the beam is about 1.1 mW on the drum surface at a

wavelength of 780 nm.

[D]

[E]

[J]

[I]

[H]

[G]

[F]

[A]

[B]

[C]

Detailed

Section

Descriptions

LASER EXPOSURE

SM 2-65 A166/A187/A189

CÓPIA NÃO CONTROLADA

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Savin SDC103A Service Manual Page 134

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