Toshiba e-STUDIO520 Service Manual page 152

Image of an original placed on the original table is scanned by the optical system. The CCD (Charge
Coupled Device) reads the optical image signals and converts them into the electrical signals. The elec-
trical signals are amplified and undergo analog-to-digital conversion, then are changed into digital sig-
nals. 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 section.
CCD
The image processing section inputs the image signal from the scanning section and applies various
image processing on the signal, then transmits the output result to the writing section.
Images are processed by the SLG board (SLG) and PLG board (PLG) in this equipment. The image
signal read in the scanning function is processed in SLG board (SLG) and the printer image signal is
processed in the PLG board (PLG).
e-STUDIO520/600/720/850 IMAGE PROCESSING
Signal
amplification conversion
Fig.7-2
7 - 2
Shading
A/D
correction
to image
processing
section
March 2005 © TOSHIBA TEC