Adf Black Line - Canon imageRUNNER ADVANCE 8105 Series Service Manual

ADF black line

Image processing has been improved with this equipment, which applies optimal image
processing to the text part and the photo part respectively. Improvement in image processing,
however, highlights imperceptible dusts at the original scanning position, which may appear
as a line on the image.
Before Reading After Reading
Original
Platen roller 1
Platen roller 1 Stream reading
glass
Scanning position
[Location]
ADF
[Cause]
At stream reading with the ADF, imperceptible dusts (paper dust, toner, dust, etc.) adhere
and remain at the original scanning position, which causes a black line on the original image.
(Occurrence frequency is roughly 3/10,000 of scanning documents)
The dusts causing a black line are delivered outside the ADF together with the scanning
original; therefore, there will be no black line with the next original.
6
Troubleshooting > Image Faults > ADF black line
Result
It sticks on the
original during
scanning.
6
Troubleshooting > Image Faults > ADF black line
[Remedy]
Changing the setting value in the following service mode improves the problem of a black
line.
COPIER > ADJUST > AE > AE-TBL: Text density adjustment when adjusting image density
Setting value: Change the default (5) to 3
COPIER > OPTION > IMG-MCON > SHARP: Setting of the sharpness level on the image
Setting value: Change the default (3) to 1
COPIER > OPTION > USER > PH-D-SL2: Setting of the halftone processing in text/photo
mode
Setting value: Change the default (0) to 2
CAUTION:
When performing a field remedy, remind that the scan result changes as follows:
•
Scanning of light halftone base is skipped (to be scanned as white color)
• Blur text outline due to reduced edge emphasis level with the text
F-6-13 F-6-13
• Photo part appears coarsely
6-11
6-11