Dell 2355DN Service Manual page 23

2.2.1.3 Scanner Section
Scan Part
1) Pictorial signal input part: output signal of CCD passes through Bypass Cap change to ADC at
DS90DR218A, and defined signal between DS90DR218A and CHORUS3 processes the Image signal.
When AFE accept each pixel, CDS(Correlated Double Sampling ) technique which samples arm-level
twice is used on each pixel by using CIP4e signal.
2) Pictorial image processing part: read CCD Pixel data in terms of 600dpi Line and process Error Diffusion
Algorithm on Text mode and Photo mode, and then store Data at Scan Buffer on PC Scan mode without
algorithm.
On every mode Shading Correction and Gamma Correction are executed ahead, then processing is
executed later.
* Scan Image Control Specification
Minimum Scan Line Time: 0.75ms
Scan Resolution
Scan Width : 216mm
main function
- Internal 12bit ADC
- White Shading Correction
- Gamma Correction
- CCD Interface
- 256 Gray Scale
3) CCD Operating Part : CCD Image sensor use +5V and Inverter uses +24V
- CCD Maximum Operating Frequency : 10MHz
- CCD Line time : 0.75ms
- White Data output Voltage : 0.7V±0.5V (Mono Copy, 0.75ms/line)
- Maximum Inverter Current : 600 mA Max.( +24V)
1) Scanning Device:
2) Supported Operating Systems:
3) Compatibility:
4) Maximum Scan Width:
5) Effective Scan Width:
6) Optical Resolution:
7) Interpolated Resolution
8) Preview Scan:
Service Manual
Product spec and feature
: Max. 600DPI
Color CCD (Charge Coupled Device) Module
Windows 2000/2003/ XP/Vista/2008, MAC (English only, no status
monitor, web download only)
Mac: PostScript Network Print only
Linux: Red Hat 8.0~9.0, Fedora Core 1~3, Mandrake 9.0~10.2, SuSE
8.2~9.2
TWAIN Standard
216mm (8.5 inches)
208mm (8.2 inches)
600x600 dpi
Maximum 4800 dpi
75 dpi
2-14