Theory of Operation Ver. 8.0 Jun. 2008
12. Developing section
5
5
Composition/Operation
B. IU/Y,M,C
1.
Toner supplied from the front end of the Developing Unit is fed to the lower screw. It
is then fed to the rear of the unit, while being mixed with developer and electrically
charged by the Supply/Agitating/Conveying Screws.
2.
The TCR Sensor installed on the underside of the Developing Unit detects toner-to-
carrier ratio during this time.
3.
The developer, fed to the rear of the Developing Unit, is conveyed further to the
upper screw.
4.
The developer is conveyed onto the developing roller. The doctor blade then con-
trols the height of the developer brush to ensure that the developer on the develop-
ing roller levels out.
5.
The Toner sticks to the electrostatic latent image on the surface of the PC Drum.
The developer that is left on the Sleeve is returned to the upper screw by the mag-
netic pole positioning of the Developing Roller. It is then conveyed to the front side
of the Developing Unit.
4036ma2605c0
Supply/agitating/
conveying screws
PC drum/
Y,M,C
Developing roller
Toner supplied
from sub hopper
Doctor blade
Y107522-3 Theory of Operation
