Chapter 77-327.5 Drum Unit7.5.1 Drum Unit7.5.1.1 Overview 0014-0776Color iR C3380G / Color iR C2880G / Color iR C3380i / Color iR C3380 / Color iR C2880i / Color iR C2880 / iR C3480 / iR C3480i / iR C3080 / iR C3080i / iRC2550The machine uses 4 drum units (Y, M, C, Bk), each consisting of a drum unit, developing cylinder, primary charging roller, and carrier and housed under the ITB.The machine supplies toner as follows:The toner coming from the hopper assembly is moved to the toner transport feedscrew A of the drum unit; then, it is moved farther by the toner transport feedscrewB while being mixed with carrier to reach the developing cylinder. During printing, a layer of toner is formed on top of the layer of carrier deposited on the devel-oping cylinder; the toner then jumps (toner projection) to the photosensitive drum for development.The residual toner on the developing assembly after development is scraped off by the cleaning blade, and is moved by the waste toner feedscrew for collectioninside the waste toner case.The following 3 types of electrical loads are associated with the supply path:- motor: 2 types (development motor, drum/ITB motor)- clutch: 1 type (developing sleeve clutch)F-7-37[1] Developing cylinder[2] Photosensitive drum[3] Waste toner feedscrew[4] Primary charging roller[5] Carrier[6] Toner transport feedscrew A[7] Toner transport feedscrew BM1: drum/ITB motorM2 and M3: development motorCL1 through CL4: developing sleeve clutchD-CONTonerM1CL1 4M2 3 [1][2][3][4][5][6][7]
