Samsung CLX-8540ND Service Manual page 56

2.3.3.5 Scanner
2.3.3.5.1 Scanning Technology
1) Color Separation : Single-Pass color separation
Color separation is done with transmissive color filters put over the CCD elements themselves as part of
CCD manufacturing process. The CCD used in CLX-8540ND Series has three rows of imaging elements.
Each row has a color filter directly over the CCD elements, one row red, one green, and one blue.
2) Image Signal Input :
The output signal of CCD is designed for being ADC in S4L9335X through Bypass-Cap, and then
processing through the Signal which is defined between S4L9335X and CIP4.
It uses CDS (Correlated Double Sampling) which implement double Sampling for black level and image by
using signal of CIP4E, when AFE receives each pixels.
3) Image Processor :
It reads pixel data of CCD (Charge Coupled Device) by 600dpi Line, and in accordance with the mode set
from CIP4, said data is experiencing Error Diffusion Algorithm in mode or stored at Scan Buffer through
DMA without Halftoning Algorithm in PC Scan mode. At this time, both above modes conduct processing
after Shading Correction and Gamma Correction.
4) Optical System: Lens Reduction type All-In-One( Scanning Lamp + Lens + CCD Image sensor)
5) Light Source : Xenon Lamp
6) Scanning method
- Platen : Optical Moving
- DADF: Document Moving
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