Chapter 77-7These AC and DC biases are applied between sheets while an image is being formed (until the end of the ongoing job).7.5.1.2 Primary Charging Roller Cleaning Mechanism 0006-5992iR2270 / iR2870 / iR3570 / iR4570 / / iR2270N / / iR2870N / / iR3570N / / iR4570N / iR2230 / / / iR3530 /The machine uses a brush [3] to clean the primary charging roller [2], which remains in contact with the photosensitive drum [1]. The brush has a reciprocatingmechanism and is driven by a cam [4], operating while the photosensitive drum is being driven.F-7-137.6 Drum Cleaner Unit7.6.1 Photosensitive Drum Cleaning 0007-5224iR2270 / iR2870 / iR3570 / iR4570 / / iR2270N / / iR2870N / / iR3570N / / iR4570N / iR2230 / / / iR3530 /The cleaning blade is kept in contact with the surface of the photosensitive drum. It serves to scrape off the residual toner left behind from transfer to paper forcollection in the waste toner box.7.7 Developing Unit7.7.1 Controlling the Developing Bias 0006-6032iR2270 / iR2870 / iR3570 / iR4570 / / iR2270N / / iR2870N / / iR3570N / / iR4570N / iR2230 / / / iR3530 /T-7-9Developing BiasBoth these AC and DC biases are applied while an image is being formed, but are not applied between sheets.DC bias -450 V to -850 VAC bias 800 Vp-pDC bias -450 V to -650 V[1][2][3][4]
