Toshiba e-studio281c, Service Manual, Page: 91 / 414

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© 2005 - 2008 TOSHIBA TEC CORPORATION All rights reserved e-STUDIO281c/351c/451c
COPY PROCESS
3 - 1
3. COPY PROCESS
3.1 Expression of Colors and 4-Step Copy Process
A variety of colors can be expressed by mixing the three primary colors: Yellow, magenta and cyan.
Red can be created by mixing yellow and magenta; blue can be created by mixing magenta and cyan;
green is created by mixing cyan and yellow; and mixing all the three primary colors allows you to obtain
black.
This equipment has accomplished to improve reproducibility by adding black toner to the mixture of the
above three colors at proper ratio.
Fig. 3-1
This equipment adopts a revolver mechanism which combines the three developer units of yellow,
magenta and cyan. In this process, each image of cyan, magenta and yellow is developed in order by
rotating these developers and overlaid on the transfer belt one after another. Then the black image
developed by independent black developer unit is overlaid for the best expressions of colors. Four lay-
ers of color image (K
→
C
→
M
→
Y) on the transfer belt are transferred onto paper.
Fig. 3-2
Yellow
Red
Black
Green
Magenta
Blue
Cyan
[Three primary colors]
1st transfer roller
Transfer belt
Fuser unit
2nd transfer roller
Main charger
Photoconductive drum
Black developer
unit
Laser optical unit
Color developer unit