Actions
1. Clean the original and the scanner’s glass plate, then scan again. See Clean the scanner scanbars
on page 111
2. If the problem persists, recalibrate the scanner as indicated in Calibrate the scanner on page 112. Re-
scan your original after the calibration is completed.
3. If the problem persists, see Clipping in dark or light areas on page 157.
Vertical red and green bands over white or black background
If the scanner has not been calibrated for a long period of time, or if the last calibration failed, you can
sometimes see defects like the following. Please note the black arrow indicating the scanning direction in this
example: original on the left, scanned image on the right.
Actions
1. First, reboot the printer and re-scan or copy. Clean and calibrate the scanner as indicated in Clean the
scanner scanbars on page 111 and Calibrate the scanner on page 112. If the calibration failed, proceed
as stated in Calibrate the scanner on page 112. However, if the calibration ended correctly, scan your
original again and check that the colored vertical bands have disappeared.
2. If the problem persists, call HP support and report “vertical red/green bands after calibration”.
Vibration
If your printer is not properly placed on a at surface, or if the scanner lid does not close correctly, you may
sometimes nd that the scanned image suers from vibration, as in the following example: original on the
left, scanned image on the right.
1. Make sure that the scanner is placed on a at surface and the scanner lid is correctly closed. Scan your
original again.
2. If the problem persists, change (increase or decrease) the scanning resolution and re-scan your original.
We also recommend turning the original 90 degrees before scanning it again.
3. If the problem persists, analyze pattern D of the diagnostic plot. If you see the problem shown on the
right, call HP support and report a “vibration problem”.
ENWW Vertical red and green bands over white or black background 159
To Next Page
Loading...
