Brother International DCP1000 Service Manual - Page 22

3.2.2.2 Print process mechanism Toner augers Toner cartridge Toner sensor ( Paper Developer \ roller \\J O \ rj Toner supply roller Transfer roller Drum unit Laser-sensitive drum Cleaner roller Charger (Corona wire) Polygon minor Polygon motor Laser unit Cover glass Mirror Mirror The print process unit works with laser beam, electrical charges, and toner. The graph below shows the transition of electrical charge on the surface of the laser-sensitive drum through the five processes: charging, exposing, developing, transferring, and erasing processes. A single cycle of laser-sensitive drum operation +1000 Electrical +700 charge on the drum surface (V) +400 1 +300 (b) Time 0 , Charges the drum surface positively. (1) Exposes the drum surface to a laser beam to form a latent image and develops the latent image with toner. (a) Unexposed area (Non-image area) (b) Exposed area (Image area) © Transfers the toner-formed image from the drum to paper. ® Erases the residual potential. 3-8