When i open the canoscan toolbox, and try to scan, it says "unable to select twain source." i have tried the troubleshooter, downloaded the driver and the entire canoscan program (for 64-bit vista) from canon's website, and tried many other fixes.. It worked before but when i connect usb on windows 7 and open canoscan toolbox (or press the scan button on the scanner which opens the same software) it keeps telling me that its unable to acquire twain source. even when i open microsoft fax or scan software it says it can't find the twain device or scanner (dont remember exact msg on that one).. Unable to select twain source please help, my canon lide 20 flatbed scanner has recently started coming up with this - canon lide20 flatbed scanner question.
My scanner a canoscan lide 500f i can't get it to scan as it come up with ' unable to open twain source, please check connection then restart toolbox. the connetion. Unable to open twain source its been working well on my new dell xps8700 running windows 10 for over 6 months. suddenly i get "unable to open twain source please check connection then re-start toolbox" unplugging and plugging the connection the computer gives the little beeps acknowledging the connection.. Cannot communicate with scanner.cable may be disconnected may be turned off.check status .scanner driver will be closed.could not open the twain source. make sure there is a valid source for your scanner in the twain directory found in the windows directory..
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