HP PageWide XL 4000 User Guide - Page 127

Wrinkles or folds

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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 155. Re-scan your original afterwards. 2. If the streaks remain, recalibrate the scanner as indicated in Calibrate the scanner (MFP only) on page 160. Make sure you clean the maintenance sheet before calibrating the scanner, and check that the maintenance sheet is not damaged (if so, call your support representative and ask for a new maintenance sheet). Rescan 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 support 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 155. 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 when the scanned original is perfectly flat against the glass plate. However, whenever the original contains wrinkles or folds, these defects are clearly visible in the scanned image (as shown in the following example). ENWW Scanner troubleshooting 121

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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
155
. Re-scan your original afterwards.
2.
If the streaks remain, recalibrate the scanner as indicated in
Calibrate the scanner (MFP only)
on page
160
.
Make sure you clean the maintenance sheet before calibrating the scanner, and check that the maintenance
sheet is not damaged (if so, call your support 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 support 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
155
.
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 when the scanned original is perfectly
flat
against the glass plate. However, whenever the original contains wrinkles or folds, these defects are clearly
visible in the scanned image (as shown in the following example).
ENWW
Scanner troubleshooting
121