Color Developer Unit; Functions - Toshiba e-STUDIO281c Service Manual

12.5 Color Developer Unit

12.5.1

Functions

Mixer-R
1) Color developer material
The developer material consists of the carrier and toner. The carrier is made of electrically conduc-
tive ferrites which is 30-100 µm and the toner is made of the resin particle which is 5-20 µm. Since
the developer material deteriorates after a long time use, periodic replacements are needed.
2) Mixer unit
The carrier and toner are frictionized each other when the developer material is stirred. Then the
carrier is positively charged (+) and the toner is negatively charged (–), and the toner is adhered by
the electrostatic force.
3) Developer sleeve (Magnetic roller)
These aluminum rollers have magnets inside. The developer material is pulled by these magnets to
form a magnetic brush. The magnets are fixed at their position so only the sleeve rotates. By this
rotation, the developer material is transported to the developer sleeve. Then the magnetic brush
formed at the developer sleeve sweeps over the drum surface and thus development is performed.
4) Doctor blade
The doctor blade controls the amount of the developer material from the developer sleeve so that
the magnetic brush of the developer material can contact with the drum surface properly.
5) Color toner cartridge
The color toner cartridge and the color developer units are fitting each other to prevent misinstalla-
tion of the color toner cartridge. Therefore, the revolver unit has no device preventing misinstallation.
June 2005 © TOSHIBA TEC
Developer sleeve
Doctor blade
Mixer-F
Fig.12-7
e-STUDIO281c/351c/451c DEVELOPER UNIT
12 - 9
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