Canon FAX-L1000 - Manual (Page 194)

3-50
FAX-L1000 Chapter 3: Technical Reference
2.5.3 Toner cartridge
a) Functions
Figure 3-18 Toner Cartridge
The image formation system is the central hub of the fax, and consists of the photosensitive
drum, developing unit, charging rollers, etc.
When the PRINT signal (nPRNT) is sent from the SCNT board to the ECNT board, the
ECNT board drives the main motor to rotate the photosensitive drum, developing cylinder,
primary charging roller, and transfer charging roller.
The primary charging roller uniformly applies negative charges on the surface of the
photosensitive drum. To form a latent image on the photosensitive drum, the laser beam
modulated by the nVDO signal is exposed onto the photosensitive drum surface.
The latent image formed on the photosensitive drum is changed to a visible image by the
toner on the developing cylinder, then transferred onto paper by the transfer charging roller.
Residual toner on the photosensitive drum surface is scraped off by the cleaning blade. The
potential on the drum is made uniform by the primary charging roller in preparation for the
next latent image.
The cartridge has a toner sensor that detects the toner level and no cartridge.
If the toner in the cartridge becomes lower than the prescribed level or there is no cartridge
installed in the fax, the CPU notifies such information to the SCNT board.
Laser beam
Drum protective shutter
Developing cylinder
Photosensitive drum Cleaner blade
Primary charging roller
Blade