HP Designjet T3500 Production eMFP - Manual (Page 240)

Incorrect edge detection, mostly when scanning tracing paper
Tracing or translucent papers can be scanned with good results, although totally transparent papers are not
supported. Nevertheless, the resulting image may have extra margins or some clipping of the content in
some situations when detection of the edge of the paper is not accurate, which may also happen when
scanning plain paper if the glass plate is dirty. In order to avoid these undesired effects, please follow these
recommendations.
Actions
1. Carefully clean the scanner’s glass plate and the original to be scanned with a cloth. Turn the original 90
degrees if possible and re-scan it afterwards. Remember to select Translucent as the paper type at the
scanner if your original is translucent.
2. If the problem persists, please calibrate your scanner, and re-scan your original again afterwards.
3. If the problem persists in the case of translucent paper, attach a sheet of white paper to the back of the
original to be scanned. Remember to select White paper as the paper type for the scanner in this case.
A copied or scanned image is very skewed
Originals are often loaded into the scanner with some degree of skew. In order to correct for this unavoidable
problem, the scanner has a built-in automatic de-skew algorithm, which measures the skew in the original
and rotates the scanned image so that the result is perfectly straight. However, in some cases the de-skew
algorithm may increase the skew rather than correcting it. In other cases, the skew is so bad that it cannot be
automatically corrected.
To load the original with minimum skew, grasp the original with the image facing up and your hands at left
and right edges. You are recommended to avoid resting your hands or the original on the scanner's input tray.
Push the original into the scanner insertion slot until you feel the whole top border of the original pressing
against the scanner rubber rolls, which will load the original after a delay of 0.5 seconds. Now you can take
your hands off the original. If you are not happy with the way the scanner has grabbed your original, you can
press
and try again.
The action of the automatic de-skew algorithm can be deactivated by pressing , then Scan preferences
or Copy preferences (you might want to deactivate it in one case but not in the other). You can also
deactivate the automatic de-skew from the Settings button at every new scanner job.
230 Chapter 22 Troubleshooting scan-quality issues ENWW