Xerox Phaser 3300, Servce Manual

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Phaser 3300MFP Service Manual 2-23
Theory of Operation
Scan Part
Pictorial signal input part: output signal of CCD passes through Bypass Cap
change to ADC at HT82V26, and defined signal between HT82V26 and
CHORUSm 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.
1. Pictorial image processing part: read CCD Pixel data in terms of 600 dpi
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
a) Minimum Scan Line Time: 0.7062 ms
b) Scan Resolution: Max. 600 DPI
c) Scan Width: 216 mm
d) Main function
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Internal 12 bit ADC
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White Shading Correction
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Gamma Correction
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CCD Interface
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256 Gray Scale
2. CCD Operating Part: CCD Image sensor use +5V and Inverter uses +24V
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CCD Maximum Operating Frequency: 10 MHz
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CCD Line time: 0.7062 ms
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White Data output Voltage: 0.7 V ± 0.5 V (Mono Copy, 0.75 ms/line)
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Maximum Inverter Current: 600 mA Max. (+24 V)
Control Panel Section
Configuration
The Control Panel uses Main Control and separated OPE Chip Micom and
work as inner program, systemic operation is serial system which exchange
Date with SIO Port of Main Control. The Control Panel consists of the Micom
part, Matrix part, and LCD.
Micom controller
Micom has ROM, RAM, I/O Port built-in and displays and lights LCD by CPU
command of main control part and report Key recognition Data to Control
Board.