thanks for suggetion actually i use scanner for photo scanning when i complaint to company they gave me replacement scanner but same problem appear again.so i attached my scanner to another PC and Scan i never face the problem but when again i attached with my PC i got same ProblemIf you scan several subject the full of size or larger than the scanner flatbed (something like newspaper pages) does the band appear in the same position each time.
Suggests, image sensor fault. I doubt if it's economic to repair that.