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2001 CANON INC. 2000 2000 2000 2000 CANON iR2200/iR2800/iR3300 REV.0 MAR. 2001
CHAPTER 4 IMAGE FORMATION SYSTEM
4-7 P
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.