Flare in the image when scanning glossy originals
If the scanner is miscalibrated, or if the original plot you are trying to scan is very glossy or reflective, you can sometimes find flare in the scanned image, as in the following example: original on the left, scanned image on the right.
Image © www.convincingblack.com, reproduced with permission.
Actions
1.Clean the original and the scanner’s glass plate, then scan again.
2.If the problem persists, recalibrate the scanner as indicated in Scanner maintenance on page 156. Make sure you clean the maintenance sheet before calibrating the scanner, and check that the maintenance sheet is not damaged (if so, call HP support and ask for a new maintenance sheet).
3.If the problem persists, see Clipping in dark or light areas on page 208.
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.Clean and calibrate the scanner as indicated in Scanner maintenance on page 156. If the calibration failed, proceed as stated in Calibrate the scanner on page 165. 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”.
The stop-start effect
Your printer is a complex machine, which may be working on several tasks at the same time. If you are trying to scan while printing or processing a job in the printer queue, you may find that the scanner stops for a while and then restarts. Although this is normal behavior, in some cases the scanned image may have defects as a result of this
To illustrate this effect, here is an example of an original image.
210 Chapter 23 Troubleshooting | ENWW |