System Control Pc Board (Sys) - Toshiba e-STUDIO2500c Service Manual

7.4

SYSTEM CONTROL PC BOARD (SYS)

7.4.1 Features
1) Image processing functions realized on the SYS board are controlled by the CPU on the SYS board.
2) The image processing functions of the SYS board realizes the followings:
- Black over print (PostScript)
- Pure black / Pure gray (PostScript) / Pure gray (PCL6C)
- Chroma adjustment (PCL6C)
- Brightness adjustment (PCL6C)
- Contrast adjustment (PostScript / PCL6C)
7.4.2 Functions of image processing circuit
On the SYS board, the following image processing functions are realized.
1) Black over print (PostScript)
When black data of text or graphic object are formed on a certain background with no written data
underneath them, the color of the paper comes out around the black data when "out-of-color regis-
tration" is occurring. To prevent this phenomenon, this process enables to keep the background
color around the black data formed as a part of the text or the graphic object on the printer data.
Ideal image
Black data
Paper
Background
2) Pure black / Pure gray (PostScript) / Pure gray (PCL6C)
This function is to printout the text and graphics formed as black data with black toner only on the
printer data, not using 4 color toner. The gray text/graphics are also printed out with black toner only.
3) Chroma adjustment (PCL6C)
This function adjusts chromaticness of the printer data.
4) Brightness adjustment (PCL6C)
This function adjusts brightness of the printer data.
5) Contrast adjustment (PostScript, PCL6C)
The contrast adjustment is applied to the print data.
e-STUDIO2500c/3500c/3510c IMAGE PROCESSING
Out of color registration
Black data
Paper
Background
Fig. 7-7
7 - 8
Black over print
Black data
Background
May 2006 © TOSHIBA TEC
Paper