Savin SDC103A Service Manual download pdf (Page 109)

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4.3 SCANNER SECTION

4.3.1 Photoelectric Conversion

The color CCD converts the light reflected from the original into RGB analog

signals (4.475 MHz for each signal: even-pixel and odd-pixel). Each CCD

line has 5,000 pixels and the resolution is 400 dpi (15.7 pixels/mm).

4.3.2 Signal Processing

(1) Signal Amplification

Odd-pixel and even-pixel RGB analog signals from the CCD are amplified by

operational amplifiers.

(2) Signal Composition

The amplified signals (even-pixel and odd-pixel for each RGB color) are

combined by the MPX before A/D conversion.

(3) Feedback

The CPU on the scanner IPU board receives the feedback data for white

level and black level from the shading circuits and feeds it to the CLPs and

the operational amplifiers through the D/A converter (see section 4.3.5, D/A

conversion). The feedback data from the CPU are updated every time the

main switch is turned on.

4.3.3 A/D Conversion

The A/D Converter converts the analog signals (each RGB color) to digital

signals of 8 bits (256 grades) per pixel.

IMAGE PROCESSING

A166/A187/A189 2-40 SM

CÓPIA NÃO CONTROLADA

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Savin SDC103A Service Manual Page 109

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