COPYRIGHT © 2001 CANON INC. 2000 2000 2000 2000 CANON iR2200/iR2800/iR3300 REV.0 MAR. 2001CHAPTER 4 IMAGE FORMATION SYSTEM4-10 P3.2 Turning On/Off the BiasThe transfer charging roller bias is turned on/off as follows:[1] When the transfer charging output enable signal from the DC controller PCB goes ‘0’,the transfer bias output signal (serial communication) is generated.[2] The transfer bias output control signal (pulse) is generated, and the DC bias is sent tothe transfer charging roller.3.3 Controlling the Detection of the Transfer Charging RollerResistance (ATVC control)The transfer charging efficiency changes because of changes in humidity and deteriora-tion in the transfer charging roller. The reference current is applied to the transfer chargingroller during initial multiple rotation after the main power switch is turned on, and the re-sulting output voltage is measured for correction.[1] The reference current is applied to the transfer charging roller, and the output is checkedas a voltage level for use as feedback to the PW-CPU.[2] The transfer charging mechanism operate using the voltage level determined by the PW-CPU.If you have replaced the transfer charging roller with a new one, be sure toexecute 'clean roller' in user mode ('adjust/clean').
