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Canon MF8580Cdw Service Manual page 53

Mf8500/mf8200 series
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Manual - 750 pages
User manual - 750 pages
Getting started - 292 pages

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2
Technical Overview > Image Formation System > Controls > Image stabilization control
■ Image stabilization control
● Overview
This product controls image stabilization to avoid faulty images due to environmental
changes, deteriorated photosensitive drum or toner, etc. The controls listed in the table below
are executed when needed to stabilize image quality.
Control
D-max control
Correct values of the primary charging bias and/or developing bias based
on signals from the environment sensor.
D-half control
Correct the gradation data in the main controller PCB based on signals
from the color displacement / density sensor.
Color displacement
Correct the video signal output timing based on signals from the color
correction control
displacement / density sensor.
Auto-gradation
To stabilize the image gradation density characteristics, users execute full
correction control
or quick correction, or copy image correction.
Laser scanner unit
Toner cartridge
ITB unit
Bias
High-voltage
power supply PCBs
Auto-gradation
D-max
correction control
Reader unit
2
Technical Overview > Image Formation System > Controls > Image stabilization control
Description
T-2-13
Color
displacement/density
sensor
Signal from color
displacement/density signal
Video signal
Color displacement
D-half
correction control
F-2-29
● Execution timing
The table below lists the execution timing and duration of each control.
Duration
Execution
MF8500
MF8200
No.
timing
series
series
1
Power-ON
Approx.195
Approx.120
seconds
seconds
2
Toner cartridge
Approx.195
Approx.120
replacement
seconds
seconds
3
Environmental
Approx.195
Approx.120
changes
seconds
seconds
4
After the pre-
Approx.195
Approx.120
defined counts
seconds
seconds
printed
5
After the pre-
Approx.195
Approx.120
defined time
seconds
seconds
elapsed
6
Resumed from
Approx.100
Approx.60
sleep (after 8
seconds
seconds
hours or more)
7
Full correction
Approx.100
Approx.60
seconds
seconds
8
Quick correction Approx.100
Approx.60
seconds
seconds
9
Copy image
Approx.100
Approx.60
correction
seconds
seconds
Color
D-max D-half
displacement
Remarks
correction
Executed at initial
rotation
Executed at initial
rotation
Executed after job
completion
Detected by the
environment sensor
Executed after job
completion
Executed after job
completion
-
Executed after job
completion upon
resumed
-
Executed by users
-
-
2-24
T-2-14
2-24

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