Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Bands in scans

Scans of various drawings and paintings done with the HP Scanjet 4600 exhibit alternating light and dark bands parallel to the direction of the scan. The bands vary in intensity depending on the color or value of the area being scanned. This problem showed up on two samples of the scanner. HP has been of no real help in solving this problem and I have returned both samples. The design is ideal for scanning large items but, unfortunately, the bands make the product useless.