Image Stabilization Control; Overview; Apvc Control; Atvc Control - Canon iR3570 Service Manual

Canon ir4570; ir3570; ir2870; ir2270 laser multifunction printer/copier
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Chapter 7
In [1] above, a cleaning bias (-2600 V) is applied.

7.4 Image Stabilization Control

7.4.1 Overview

iR2270 / iR2870 / iR3570 / iR4570 / / iR2270N / / iR2870N / / iR3570N / / iR4570N / iR2230 / / / 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 / / iR2270N / / iR2870N / / iR3570N / / iR4570N / iR2230 / / / 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.
7.4.3 ATVC Control
iR2270 / iR2870 / iR3570 / iR4570 / / iR2270N / / iR2870N / / iR3570N / / iR4570N / iR2230 / / / iR3530 /
The machine is provided with a constant current control mechanism that can be enabled or disabled in service mode: COPIER>OPTION>BODY>TRANS-SW.

7.5 Drum Unit

7.5.1 Charging Mechanism

7.5.1.1 Controlling the Primary Charging Bias

iR2270 / iR2870 / iR3570 / iR4570 / / iR2270N / / iR2870N / / iR3570N / / iR4570N / iR2230 / / / iR3530 /
Primary Charging Bias
7-6
Image write
Main motor
(M-motor)
Primary charging
(PRI)
Laser
(LD)
Developing AC
(DEV_AC)
Developing DC
(DEV_DC)
Developing clutch
(DEV_CL)
Transfer
(TR)
Static removal
(SEP)
BK
[2]
AC bias
2700 Vp-p (max.)
end
[1]
F-7-11
T-7-7
corrects the development contrast.
determines the appropriate primary charging DC bias and
developing DC bias.
corrects the transfer bias.
[1]
F-7-12
T-7-8
[3]
0006-5986
0006-5987
0006-5989
0006-5991

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Ir2870Ir4570Ir2270

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