Image Stabilization Control - Canon iR4570 Series Service Manual

Chapter 7

7.4 Image Stabilization Control

7.4.1 Overview
iR2270 / iR2870 / iR3570 / iR4570 / 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 all times, the machine uses the following control mechanisms:
[1] Drum film thickness detection
control
[2] Developing contrast control
[3] ATVC control
7.4.2 APVC Control
iR2270 / iR2870 / iR3570 / iR4570 / 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 suit the 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 the drum unit is
replaced.
7-10
T-7-7
corrects the development contrast.
determines the appropriate primary
charging DC bias and developing DC bias.
corrects the transfer bias.
BK
[2]
[1]
F-7-12
[3]
0006-5986
0006-5987