HP DesignJet T850 DesignJet T850 Printer Series DesignJet T950 Printer SeriesU - Page 139

Light-colored area fills are missing in the scan or copy

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1. Repeat the scan, making sure that the product is correctly positioned: it is flat on the floor and it does not move. Turning the original 90 or 180 degrees and scanning it again may also solve the problem. 2. If the problem persists, check that the original to be scanned is not skewed, and that it does not become skewed during the scan. If so, see Incorrect paper advance, skew during scanning, or horizontal wrinkles on page 139. You might also want to deactivate the automatic de-skew algorithm as indicated in A copied or scanned image is very skewed on page 144. 3. If there is no skew but the problem persists, clean and calibrate the scanner as indicated in Clean the scanner scanbars on page 93 and Calibrate the scanner on page 95. Take care not to move the printer during the calibration, and check that the maintenance sheet is correctly positioned before starting the calibration. Also check that the maintenance sheet is not damaged before calibrating the scanner (an old or damaged maintenance sheet may cause this problem); if it is damaged, reprint it as explained in Calibrate the scanner (see Calibrate the scanner on page 95). 4. If the problem persists, proceed to analyze the following areas of the diagnostic plot: ■ D, H and L (for three modules, 0-Left, 1-Middle, and 2-Right and its intersection) If you see any of these defects in the studied areas, call HP support and report a "line discontinuities" error after calibration. The four vertical thin black lines at the beginning and the end of the diagnostic plot show, approximately, the position of the intersection between scanbars, where this kind of error usually appears. If the error appears outside these areas, call HP support and report "line discontinuities within a scanbar". Light-colored area fills are missing in the scan or copy When scanning or copying a map with a light area at the top, the Background color removal setting could interpret it as a background color, therefore removing it and other similar areas. In the example below the original is on the left, the scanned image on the right: 130 Chapter 16 Troubleshooting copy and scan quality issues (only MFP)

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1.
Repeat the scan, making sure that the product is correctly positioned: it is flat on the floor and it
does not move. Turning the original 90 or 180 degrees and scanning it again may also solve the
problem.
2.
If the problem persists, check that the original to be scanned is not skewed, and that it does
not become skewed during the scan. If so, see
Incorrect paper advance, skew during scanning,
or horizontal wrinkles
on page
139
. You might also want to deactivate the automatic de-skew
algorithm as indicated in
A copied or scanned image is very skewed
on page
144
.
3.
If there is no skew but the problem persists, clean and calibrate the scanner as indicated in
Clean
the scanner scanbars
on page
93
and
Calibrate the scanner
on page
95
. Take care not to move the
printer during the calibration, and check that the maintenance sheet is correctly positioned before
starting the calibration. Also check that the maintenance sheet is not damaged before calibrating
the scanner (an old or damaged maintenance sheet may cause this problem); if it is damaged,
reprint it as explained in Calibrate the scanner (see
Calibrate the scanner
on page
95
).
4.
If the problem persists, proceed to analyze the following areas of the diagnostic plot:
■
D, H and L (for three modules, 0-Left, 1-Middle, and 2-Right and its intersection)
If you see any of these defects in the studied areas, call HP support and report a “line
discontinuities” error after calibration.
The four vertical thin black lines at the beginning and the end of the diagnostic plot show, approximately,
the position of the intersection between scanbars, where this kind of error usually appears. If the error
appears outside these areas, call HP support and report “line discontinuities within a scanbar”.
Light-colored area fills are missing in the scan or copy
When scanning or copying a map with a light area at the top, the
Background color removal
setting could
interpret it as a background color, therefore removing it and other similar areas.
In the example below the original is on the left, the scanned image on the right:
130
Chapter 16
Troubleshooting copy and scan quality issues (only MFP)