Lexmark Optra C710 Service Manual - Page 48

5016-001 Intermediate Transfer Unit Function of the intermediate transfer unit The intermediate transfer unit consists of the transfer belt, belt cleanser and waster toner bottle in which cleaned toner is collected. The transfer belt is made of an electrically conductive resin. The toner image, when placed on the organic photoconductor (OPC) drum is transferred onto the transfer belt by an electric field. The belt makes four turns, so that four color toner images, yellow (Y), magenta (M), cyan (C) and black (BK) are transferred onto the belt. The color image is formed on the transfer belt and the entire image is transferred onto paper by the transfer roller forming the color image on the paper. Note: While the four color toner images are still on the transfer belt the transfer roller, discharge roller and cleaning roller are pulled away from the transfer belt. An optical reflector is attached on one edge of the outer circumference of the transfer belt and is used by the home position sensor to detect the position of the belt. After the image is transferred to the paper, any toner remaining on the belt is cleaned by the cleaning roller and transferred through the transport coil into the waste toner bottle in the belt unit. When cleaning the remaining toner, after the image has been transferred to paper, the transfer roller, discharge roller and cleaning roller, touch the transfer belt. 1-24 Service Manual