Image Stabilization Control; Overview; Apvc Control; Atvc Control - Canon iR3245 Series Service Manual

7.4 Image Stabilization Control

7.4.1 Overview

iR3225 / iR3225N / iR3235 / iR3235N / iR3245 / iR3245N
At times, changes in the environment or wear on the machine can cause its image output to become unstable. To obtain a stable image, the machine uses the fol-
lowing control mechanisms.

7.4.2 APVC Control

iR3225 / iR3225N / iR3235 / iR3235N / iR3245 / iR3245N
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.

7.4.3 ATVC Control

iR3225 / iR3225N / iR3235 / iR3235N / iR3245 / iR3245N
The machine is provided with a constant current control mechanism that can be enabled or disabled in service mode: COPIER > OPTION > BODY > TRANS-SW.
[A] APVC control: Corrects the primary charging bias.
[B] ATVC control: Corrects the transfer bias.
[C] PASCAL control: Corrects the gradation density of an image.
MN-CON
[ C ]
[1]
[3]
[ A ]
[1] Primary charging roller
[3] Developing assembly
[5] Reader
[5]
[2]
[4]
[ B ]
DC-CON
F-7-8
[2] Photosensitive drum
[4] Transfer roller
MN-CON: Main controller
DC-CON: DC controller
Chapter 7
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