Chapter 77-11Transfer bias for cleaning: -2600 VThe transfer bias is used at time of image formation, while a voltage of a specific level is applied between sheets for cleaning of the transfer roller.7.9.3 Cleaning7.9.3.1 Transfer Roller Cleaning Mechanism 0006-6318iR2270 / iR2870 / iR3570 / iR4570 / / iR2270N / / iR2870N / / iR3570N / / iR4570N / iR2230 / / / iR3530 /The machine uses the transfer roller cleaning mechanism to return the toner sticking to the transfer roller back to the photosensitive drum by applying a cleaningbias to the roller.Once the toner reaches the drum, it is scraped by the photosensitive drum cleaning blade for collection in the waste toner box.7.9.4 Separation Mechanism7.9.4.1 Controlling the Static Eliminator Bias 0006-6001iR2270 / iR2870 / iR3570 / iR4570 / / iR2270N / / iR2870N / / iR3570N / / iR4570N / iR2230 / / / iR3530 /Static Eliminator Bias1st side: -2300 V2nd side: -3000 VA DC bias is applied between sheets while an image is being formed. (It is applied until the ongoing job is over.)7.10 Transfer Mechanism7.10.1 Transfer Guide Bias7.10.1.1 Transfer Guide Bias Control 0007-5295iR2270 / iR2870 / iR3570 / iR4570 / / iR2270N / / iR2870N / / iR3570N / / iR4570N / iR2230 / / / iR3530 /To prevent soiling of the transfer guide with toner or the photosensitive drum with toner images, the following transfer guide bias is applied to the transfer guide.The surface of the transfer guide is covered with an insulating sheet.Transfer guide bias1st side: -570 V2nd side: -740 V7.11 Photosensitive Drum Cleaning7.11.1 Outline 0006-6033iR2270 / iR2870 / iR3570 / iR4570 / / iR2270N / / iR2870N / / iR3570N / / iR4570N / iR2230 / / / iR3530 /The photosensitive drum cleaning mechanism uses the photosensitive drum cleaning blade to scrape off the residual toner left behind from transfer; the toner thuscollected is moved to the waste toner box.7.11.2 Collection of Waste Toner 0006-6034iR2270 / iR2870 / iR3570 / iR4570 / / iR2270N / / iR2870N / / iR3570N / / iR4570N / iR2230 / / / iR3530 /The waste toner scraped off by the cleaning blade is moved by the waste toner feedscrew to the waste toner box found at the front of the machine. The waste tonerfeedscrew is operated by the drive from the drum flange.7.11.3 Checking the Waste Toner Box 0006-6036iR2270 / iR2870 / iR3570 / iR4570 / / iR2270N / / iR2870N / / iR3570N / / iR4570N / iR2230 / / / iR3530 /To prevent leakage of waste toner from the waste toner box or to prevent overloading the waste toner feedscrew, the machine is equipped with a waste toner detec-tion mechanism. The waste toner box can hold about 2043 cc of toner, and the machine identifies the waste toner box as being full when there is about 1766 cc oftoner or when the toner comes to weigh about 1050 g.When the weight of waste toner increases, the waste toner case itself lowers on its own, thus causing the machine to assume that the case has become full.
