General Description - Toshiba e-STUDIO2330C Service Manual

8. IMAGE PROCESSING
8.1

General Description

The following diagram shows the process of this equipment from the input data to writing data on
the photoconductive drum surface.
Image processing is performed on the IMG and SYS boards in this equipment.
Copier
Original
Original glass
Lens
Scanning
section
[CCD]
Printer
Personal
computer
The followings are the board used for image processing.
Board
IMG board ACS, color conversion, high quality image processing, image memory editing, rectangular
area signal generation, editing processing, gamma correction, gradation processing,
compression/expansion, black component generation, blank page detection, outside erase,
smoothing processing, scanner high quality image processing and printer high quality
image processing
SYS board Black over print, pure black / pure gray, chroma adjustment, brightness adjustment and
contrast adjustment
Image of an original placed on the original glass is scanned by the optical system. The CCD (Charge
Coupled Device) reads the optical image signals and converts them into the electrical signals. The
electrical signals are amplified and undergo analog-to-digital conversion, then are changed into digital
signals. Shading correction (correction of variance in CCD elements and the light source) is performed
and the digital signal is output as an image signal from the scanning control section.
The image processing section inputs the image signal from the scanning control section and applies
various image processing on the signal, then transmits the output result to the writing control section.
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Scanning
Image processing
control
section
section
[SLG]
Image processing/
system section
USB/Network
Temporary
storage section
[HDD]
Fig. 8-1
8 - 1
writing control
section
[LGC]
[IMG]
Semicon-
ductive
laser element
[SYS]
Drum-Y
Drum-M
Function
e-STUDIO2330C/2820C/2830C/3520C/3530C/4520C
Laser control
section
[LDR]
Drum-C
Drum-K
IMAGE PROCESSING
8