Question about Canon PIXMA MP780 All-In-One InkJet Printer

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PIXMA MP780 are suddenly producing very low contrast scans for both Adobe Acrobat 7.0 Professional, Photoshop and photo copy. I don not think it is the image acquire tube...if I keep cover open and slide paper to one side, I get very dark edge as the scanner acquire tube scans the shadows under my desk.

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  • Steve Bull Jan 31, 2010

    Okay. I made an okay color copy of the telephone bill and there is a little fade off to one side. I am now trying to make a .pdf scan using Adobe Acrobat 7.0 Professional and resetting all of the setting to the defaults, and okay everything looks good. So I guess this case is closed for now. Your remote words of wisdom seemed to do the trick. Or maybe recycling the power to PIXMA MP780 via on and off switch reset the machine. Whatever. Thank you.

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It seems that the drivers have got corrupted and need to be reinstalled. Please follow the link below verbatim
Installing Devices on PCs and Laptops

Posted on Feb 04, 2010

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I would try a plain copy first, either black or color. If copies look OK then you need adjustments to your scanning software. Canon didn't make the individual parts available for that scanner so in order to replace you need to buy the entire scanner and panel assembly. There are some calibrations and adjustments available in the service mode, only available at Canon repair shops. So definitely try copies to see what your scanner is doing as when it wanders too far out of calibration it gives scanner errors and you didn't mention having those errors. If you need I can get you the scanner part number and aprox. price.

Posted on Jan 31, 2010

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