Operation; Developing Drive Control; Developer Flow - Develop QC 2235 Plus Service Manual

Developing section
8.3

Operation

8.3.1

Developing Drive control

Developing Bias/Y, M, C
Main Motor (M1)
Color PC Drum Motor (M5)
Bk PC Motor (M7)
Developing Bias/Bk
Drum Charge Corona Bias Y, M, C
Drum Charge Corona Bias Bk
Color Developing Motor (M6)
Developing Clutch/Bk (CL2)
1st Image Transfer Pressure/
Retraction Motor (M11)
2nd Image Transfer Pressure/
Retraction Motor (M13)
*1: Actual YMC timing depends on the position of each PC Drum.
8.3.2

Developer flow

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 ATDC 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. Because of the magnetic pole positioning of the Developing Roller, the developer is
conveyed onto the upper part of the Developing Roller. The Doctor Blade then controls
the height of the developer brush to ensure that the developer on the Developing 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 magnetic pole
positioning of the Developing Roller. It is then conveyed to the front side of the Develop-
ing Unit.
For IU/Y
QC 2235plus Theory of Operation Ver.1.0 Feb. 2004
Main Motor ON Signal
DC Printing DC
DC
Printing DC
PC Drum/Y
Toner Supplied
from Hopper
Supply/Agitating/Conveying Screws
2-22
Retraction Signal
AC *1
AC *1
Developing Roller
Doctor Blade
DC
DC
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