Canon imageRUNNER ADVANCE DX C5870i Service Manual page 70
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Also See for imageRUNNER ADVANCE DX C5870i:
- Faq manual (100 pages) ,
- Manual (96 pages) ,
- Faq manual (48 pages)
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Dust Detection Control
1. Before the original reaches the Guide Plate, the Guide Plate is scanned and the coordinate and width of dust are detected.
2. When the original reached the Guide Plate, the leading edge of the original is detected.
3. Data scanned before and after the original reached are compared and any data that remained are identified as dust adhering
to the Stream Reading Glass and the correction is applied.
Dust Correction Control
When identified as dust adhering to the Stream Reading Glass, data of dust is recorded for each page.
When outputting recorded pages, the image correction is applied and pages are output.
Lines with the maximum width of 20 pixels can be corrected.
Additionally, if non-continuous lines due to floating dust had occurred, they can be corrected by up to 6 pixels.
Related service mode
Adjustment of dust detection level when using DADF (between originals)
NOTE:
When using the reverse ADF, the service mode is adjusting the level only.
When using Single Pass ADF, the service mode is switch OFF/ON only.
• Adjustment of dust detection level when using DADF (between originals)
COPIER > OPTION > IMG-RDR > DFDST-L1
• Adjustment of dust detection level when using DADF (between originals) [back side]
COPIER > OPTION > IMG-RDR > DF2DSTL1
Adjustment of dust detection level (at initial stream reading)
• Adjustment of dust detection level (at initial stream reading) [front side]
COPIER > OPTION > IMG-RDR > DFDST-L2
• Adjustment of dust detection level (at initial stream reading) [back side]
COPIER > OPTION > IMG-RDR > DF2DSTL2
Settings/Registration Menu (Reference information)
• On/Off of line-like soiling removal
[Settings/Registration] > [Function Settings] > [Common] > [Scan Settings] > [Streak Prevention]
■ Blank Paper Detection
This machine can detect blank original included in the data read by stream reading when using the scan function and skip the
blank original.
Data read by stream reading is used to perform the blank paper decision by the Image Processing part.
■ Magnification change
● Changing the Magnification Ratio in Horizontal Scanning Direction
When scanning by the Copyboard and scanning by the DADF, scanning in the horizontal scanning direction for copying always
uses 100% size. The magnification ratio change is performed by the image processing of Main Controller Assembly. When
sending, the Main Controller Assembly performs the data processing with the specified resolution.
<Related service modes>
• Fine adjustment of the image magnification ratio in horizontal scanning direction at 2-sided reading [front side]
FEEDER > ADJUST > ADJMSCN1
• Fine adjustment of the image magnification ratio in horizontal scanning direction at 2-sided reading [back side]
FEEDER > ADJUST > ADJMSCN2
● Changing the Magnification Ratio in Vertical Scanning Direction
Changing the magnification ratio in the vertical scanning direction when copying is performed by changing the original feed speed,
scanning speed, and skipping ratio.
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2. Technology
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Troubleshooting
