HP Designjet T2500 eMultifunction Printer series - Manual (Page 220)

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). Re-scan your
original after the calibration is completed.
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 stop-start operation.
To illustrate this effect, here is an example of an original image.
210 Chapter 23 Troubleshooting scan-quality issues ENWW