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Canon MF8580Cdw Service Manual page 55

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
This control follows the sequence below.
1)The DC controller computes the color displacement degree for each color based on
the color displacement detection patterns measured on the ITB. The computed color
displacement data is sent to the main controller.
2)The main controller controls the video signals for each color based on the data received
from the DC controller to adjust the horizontal scanning start position, the horizontal
scanning magnification and the vertical scanning start position.
In addition to the above, the DC controller PCB on the printer engine controls the scanner
motor speed to correct the color displacement in the vertical scanning direction.
Scanning magnification
This refers to the size of the image in the horizontal scanning direction.
The laser path length is dependent on the photosensitive drums independently included
in each toner cartridge. This causes color displacement at the trailing edge due to
cartridge-dependent image area in the horizontal scanning direction.
2
Technical Overview > Image Formation System > Controls > Image stabilization control
● Auto-gradation correction control
This control is to stabilize the image gradation density characteristic.
To execute this control, go to "Adjustment / Cleaning > Auto-gradation correction" in User
mode.
This control is performed in the following 3 approaches.
Item
Description
Full correction
Gradation is corrected based on the gradation
(PASCAL)
density read on output test patterns by the
reader.
Quick correction
Gradation is corrected by D-half control not
using output test patterns.
Copy image
Gradation of copy images is corrected based
correction
on the gradation density read on output test
pattern by the reader.
Operational flow
Gradation is corrected either in the 3 approaches above in the following flow.
Image gradation
画像階調補正
correction
Copy image
Full correction
コピー画像補正
フル補正
correction
Test print 1
テストプリント1
スキャン1
Test print 2
テストプリント2
スキャン2
Test pattern
Output
Type
sheets
2 sheets 1: for error diffusion
process
2: for screen
-
-
1 sheet for for error diffusion
process
Quick correction
クイック補正
Scan 1
Full correction
Copy image correction
Quick correction
Scan 2
2-26
T-2-15
F-2-30
2-26

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