HP PageWide XL 4700 User Guide 1 - Page 150

Random vertical lines, Wrinkles or folds, and clean it as described

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A defect is a common image artifact that usually appears when using any CIS scanner. These are due to incorrect settings, product limitations, or easily solvable mistakes. A failure mode is due to malfunctions of some of the scanner components. Some of the corrective actions proposed here require the use of the scanner diagnostic plot, which you can print and scan as indicated in Scanner diagnostic plot on page 154. Do not use any printed version of this guide to test the scanner, as the resolution of the images included here is insufficient. Use the diagnostic plot when recommended in response to any of the errors described in this chapter. You are recommended to clean the CIS sensors at first installation, and at any time for good scanning quality. Random vertical lines This is one of the most common issues in sheet-fed scanners. Usually, the vertical streaks are caused by dust particles inside the scanner, or miscalibration of the scanner (in these cases, the problem can be solved). Here are some examples of images suffering from vertical lines or streaks. Note the black arrow indicating the scanning direction in these examples. Actions 1. Clean the scanner's glass plate and the original to be scanned as described in Clean the scanner's glass plate (MFP only) on page 180. Re-scan your original afterwards. 2. If the streaks remain, recalibrate the scanner as indicated in Calibrate the scanner (MFP only) on page 185. Make sure you clean the maintenance sheet before calibrating the scanner, and check that the maintenance sheet is not damaged (if so, call your service representative and ask for a new maintenance sheet). Re-scan your original after the calibration is completed. 3. If the streaks still remain, check the scanner's glass plate visually. If it is damaged (scratched or broken), call your service representative. 4. If the streaks remain, there may be dust particles inside the glass plate. Carefully take out the glass plate and clean it as described in Clean the scanner's glass plate (MFP only) on page 180. NOTE: The problem of vertical streaks cannot always be solved, due to the technological limitations of CIS technology. HP offers HD Scanners with CCD technology for higher quality requirements. If the streaks remain after the corrective actions explained above, then no further action can be taken to improve the image quality, except to buy a more expensive CCD scanner. Wrinkles or folds Scanners based on CIS technology have a high optical resolution within their focus plane, at the price of a very limited depth of field. Hence, the images are sharp and detailed only when the scanned original is perfectly flat against the glass plate. If the original contains wrinkles or folds, these defects are clearly visible in the scanned image (as shown in the following example). 144 Chapter 8 Scanning and copying (MFP only) ENWW

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A defect is a common image artifact that usually appears when using any CIS scanner. These are due to incorrect
settings, product limitations, or easily solvable mistakes. A failure mode is due to malfunctions of some of the
scanner components.
Some of the corrective actions proposed here require the use of the scanner diagnostic plot, which you can print
and scan as indicated in
Scanner diagnostic plot
on page
154
. Do not use any printed version of this guide to test
the scanner, as the resolution of the images included here is insufficient. Use the diagnostic plot when
recommended in response to any of the errors described in this chapter.
You are recommended to clean the CIS sensors at first installation, and at any time for good scanning quality.
Random vertical lines
This is one of the most common issues in sheet-fed scanners. Usually, the vertical streaks are caused by dust
particles inside the scanner, or miscalibration of the scanner (in these cases, the problem can be solved).
Here are some examples of images suffering from vertical lines or streaks. Note the black arrow indicating the
scanning direction in these examples.
Actions
1.
Clean the scanner’s glass plate and the original to be scanned as described in
Clean the scanner’s glass
plate (MFP only)
on page
180
. Re-scan your original afterwards.
2.
If the streaks remain, recalibrate the scanner as indicated in
Calibrate the scanner (MFP only)
on page
185
.
Make sure you clean the maintenance sheet before calibrating the scanner, and check that the maintenance
sheet is not damaged (if so, call your service representative and ask for a new maintenance sheet). Re-scan
your original after the calibration is completed.
3.
If the streaks still remain, check the scanner’s glass plate visually. If it is damaged (scratched or broken), call
your service representative.
4.
If the streaks remain, there may be dust particles inside the glass plate. Carefully take out the glass plate
and clean it as described in
Clean the scanner’s glass plate (MFP only)
on page
180
.
NOTE:
The problem of vertical streaks cannot always be solved, due to the technological limitations of CIS
technology. HP offers HD Scanners with CCD technology for higher quality requirements. If the streaks remain
after the corrective actions explained above, then no further action can be taken to improve the image quality,
except to buy a more expensive CCD scanner.
Wrinkles or folds
Scanners based on CIS technology have a high optical resolution within their focus plane, at the price of a very
limited depth of field. Hence, the images are sharp and detailed only when the scanned original is perfectly flat
against the glass plate.
If the original contains wrinkles or folds, these defects are clearly visible in the scanned image (as shown in the
following example).
144
Chapter 8
Scanning and copying (MFP only)
ENWW