Canon IR3300, IR2800, IR2200 manual Image Formation System

CHAPTER 4 IMAGE FORMATION SYSTEM

2.6 Controlling the Detection of the Photosensitive Drum Re- sistance (APVC control)

The primary charging efficiency changes because of changes in the site environment (tem- perature, humidity), deterioration of the charging roller, and wear of the photosensitive drum. A reference voltage is applied to the charging roller at time of last rotation every 500 prints (cumulative) or when the following service mode is executed: COPIER>FUNCTION>DPC>D-GAMMA, and the level of output current at the time is measured and corrected.

[1]When the main power switch is turned on, the reference voltage is applied to the charg- ing roller, and the output is measured as the current level for use as feedback to the PW- CPU.

[2]The photosensitive drum is charged (primary charging) using the voltage level deter- mined by the PW-CPU.

If you have replaced the drum unit with a new one, be sure to execute the following service mode: COPIER>FUNCTION>DPC>D-GAMMA.

COPYRIGHT © 2001 CANON INC. CANON iR2200/iR2800/iR3300 REV.0 MAR. 2001 4-7 P