[ubuntu] Scanned PDF scrambled

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http://ubuntuforums.org – Hi! I have a Canon Pixma MP560 which has been working perfectly until last week. The printing is ok, but there has come a scanner problem. The result is the same in SimpleScan and XSane - the scanned document shows a randomly placed grayish fields,(the original on the attatchemt is a white paper with no shades) see the attachment. If I scan to a USB inserted in the printer, the result is fine, so the problem is not in the printer. I connect to the printer wireles and uses Ubuntu 11.04 - I hope sombody out there can help me find out what is wrong! I have an Asus N73J Here is the attatchment: h (Hardware)