Canon IR3300, IR2800, IR2200 manual Turning On/Off the Bias, 10 P

CHAPTER 4 IMAGE FORMATION SYSTEM

3.2 Turning On/Off the Bias

The 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 to the transfer charging roller.

3.3 Controlling the Detection of the Transfer Charging Roller Resistance (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 charging roller 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 checked as 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 to execute 'clean roller' in user mode ('adjust/clean').

4-10 P COPYRIGHT © 2001 CANON INC. CANON iR2200/iR2800/iR3300 REV.0 MAR. 2001