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The residual toner on the drum is scraped away with a cleaning blade and delivered to the
waste toner container inside the cartridge afterwards. This cleans the surface of the
photosensitive drum.
Photosensitive drum
Cleaning blade
Residual (waste)
toner
Waste toner container
Figure 5-37.
Drum cleaning
Developing section
The developing section consists of four cartridges and the developing engaging unit. The
cartridges form a visible toner image on the photosensitive drum, and the developing
engaging unit disengages the developing cylinder from the photosensitive drum.
Below are descriptions of the cartridges and the developing engaging unit.
Cartridges
Each cartridge, like a monochrome cartridge, consists of a photosensitive drum, primary
charging roller, developing cylinder, stirrer, etc. They are driven by two motors: the drum
motor (M3) for the K cartridge, and the developing motor (M4) for the Y, M, and C cartridges.
NOTE
The cartridges in this printer are driven by two motors so that the K cartridge can be driven
independently for monochrome prints, preventing the wear of the photosensitive drum. The
DC controller PCB signals the K developing clutch (CL2) to perform monochrome printing.
The abbreviations Bk and K are used interchangeably and refer to the black developing
operations.
156 Chapter 5 Theory of operation ENWW