Brother International MFC 8500 Service Manual - Page 33
(3) Developing process, (4) Transferring process - paper jam
UPC - 012502603832
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(3) Developing process The developing process develops an electrostatic latent image formed on the drum in the exposing process, into a toner image. The developer roller attracts the toner particles fed from the toner cartridge by the toner supply roller, and then conveys them to the contact section with the laser-sensitive drum On the contact section between the developer roller and drum, the positive toner particles stick to the neutralized spots on the drum according to the principles of attraction and repulsion, transforming a latent image into a toner image. The agitator (which agitate toner particles in the chamber) and the blade allow toner particles to be fed onto the developer roller at an even thickness. (4) Transferring process When a paper passes between the drum and the transfer roller, the controller negatively charges the transfer roller. The toner is positive, so the toner image formed on the drum will be transferred onto the paper according to the same principle as for the developing process. Cleaning the transfer roller In the transferring process, the transfer roller may be contaminated with toner since not all the toner particles on the drum are transferred onto the paper but some toner particles will remain on the drum and will be transferred from the drum to the transfer roller. If paper jam or other errors occur, the toner image fails to stick to the paper and will stick to the transfer roller. To repulse this toner, the controller positively charges the transfer roller. The toner returns from the transfer roller to the drum. During non-printing rotation of the drum, the toner particles on the drum will be returned to the chamber through the developer roller. III - 7