12. Developing section
Theory of Operation Ver. 8.0 Jun. 2008
5
4
Composition/Operation
12.3.2
Developer flow
A. IU/K
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 conveyed to the rear of the unit is carried to the screw on the right.
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.
Toner sticks to the electrostatic latent image on the surface of the PC drum. Devel-
oper that is left on the sleeve is returned to the screw on the right by the magnetic
pole positioning of the developing roller. It is then conveyed to the front of the unit.
A00JT2C058AA
A00JT2C022DA
A00JT2C022DA
Supply/agitating/
conveying screws
PC drum/K
Developing roller
Toner supplied
from sub hopper
Doctor blade
TCR sensor (TCRS/K)
Theory of Operation Y107522-3
