Chapter 77-6F-7-11In [1] above, a cleaning bias (-2600 V) is applied.7.4 Image Stabilization Control7.4.1 Overview 0006-5986iR2270 / iR2870 / iR3570 / iR4570 / / iR2270N / / iR2870N / / iR3570N / / iR4570N / iR2230 / / / iR3530 /At times, changes in the environment or wear on the machine can cause its image output to become unstable. To make sure that its output will remain stable at alltimes, the machine uses the following control mechanisms:T-7-7F-7-127.4.2 APVC Control 0006-5987iR2270 / iR2870 / iR3570 / iR4570 / / iR2270N / / iR2870N / / iR3570N / / iR4570N / iR2230 / / / iR3530 /The term APVC stands for "auto primary voltage control," and it is a mechanism used to control the primary charging application voltage (DC component) to suitthe film thickness of the machine's photosensitive drum. APVC is performed every 500 sheets while the machine is in operation. It is forcibly performed when thedrum unit is replaced.7.4.3 ATVC Control 0006-5989iR2270 / iR2870 / iR3570 / iR4570 / / iR2270N / / iR2870N / / iR3570N / / iR4570N / iR2230 / / / iR3530 /The machine is provided with a constant current control mechanism that can be enabled or disabled in service mode: COPIER>OPTION>BODY>TRANS-SW.7.5 Drum Unit7.5.1 Charging Mechanism7.5.1.1 Controlling the Primary Charging Bias 0006-5991iR2270 / iR2870 / iR3570 / iR4570 / / iR2270N / / iR2870N / / iR3570N / / iR4570N / iR2230 / / / iR3530 /T-7-8Primary Charging Bias[1] Drum film thickness detection control corrects the development contrast.[2] Developing contrast control determines the appropriate primary charging DC bias anddeveloping DC bias.[3] ATVC control corrects the transfer bias.AC bias 2700 Vp-p (max.)Image writeendPrimary charging(PRI)Main motor(M-motor)Laser(LD)Developing AC(DEV_AC)Developing DC(DEV_DC)Developing clutch(DEV_CL)Transfer(TR)Static removal(SEP)[1]BK[2] [1] [3]
