Scanner Section; Scan Part - Dell 1600n - Multifunction Laser Printer B/W Service Manual

11.3 Scanner Section

11.3.1 Scan Part

Pictorial signal input part : output signal of CCD passes through Bypass_Cap change to ADC at AFE_CIP4 , and
defined signal between AFE_CIP4 and CIP4 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 CIP4
signal.
1) Pictorial image processing part : read CCD Pixel data in terms of 600dpi Line and process LAT algorithm on
Text mode, Error Diffusion Algorithm on Mixed mode, and 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 : 0.72ms
• Scan Resolution : Max. 600DPI
• Scan Width : 216mm
• main function
- Internal 12bit ADC
- White Shading Correction
- Gamma Correction
- CCD Interface
- 256 Gray Scale
2) CCD Operating Part : CCD Image sensor use +5V and Inverter uses +24V
- CCD Maximum Operating Frequency : 10MHz
- CCD Line time : 0.72ms
- White Data output Voltage : 0.7V & 0.5V (Mono Copy, 0.72ms/line)
- Maximum Inverter Current : 600 mA Max.( +24V)
Circuit Diagram
Service Manual
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