Question about Canon LIDE20 Flatbed Scanner

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Unable to select TWAIN source

Please help, my canon lide 20 flatbed scanner has recently started coming up with this error message: Unable to select TWAIN source

I have been using CanoScan4 for quite some time without any problems and this came unexpected (as most problems do).

I have since tried connecting it to various USB ports on my computer to no avail.

Any assistance will be appreciated!

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  • oldanst Nov 26, 2008

    canoscan 3200f

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Tried uninstallin and installin canon scanner drivers..nothing works..still seeing unable to select twian source..

so i tried an alternative..here we go..
on vista 64 os/vista any version..click Start>All programs>Windows fax and scan

next click new scan on top and that got me going.

some say there are issues with the way usb talks to old scanners with new operating systems like mine (vista 64). hope it helps until you find the actual cure.

Posted on Oct 13, 2009

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I had the same problem. I just wanted my Canoscan LiDE 90 to scan in PDF format. Toolbox kept insisting it was unalbe to select the twain thing. So added it my path, reinstalled, etc etc.

Then downloaded MP Navigator EX. Presto ! It's basically the same thing as Toolbox. Found it at:

http://www.canon.ca/inetCA/serviceDetail?m=load&id=4&sid=26&mid=0002200344&type=S

Posted on Sep 13, 2011

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The prompt is probably asking you for the TWAIN source to use. In that box, simply select the Canon TWAIN source. If one isn't present, install the TWAIN drivers for this scanner.

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Your post for CanoScan LiDE 25


Hi there, yes I did everything per your instructions, Toolbox is installed and it still says, "release the lock switch, detach I/F cable and reconnect. Scanner driver will be closed" and then after clicking on that it says "Unable to open TWAIN source. Please check connection then restart toolbox" I have been to the Canon site and downloaded driver sites and it says everything is working. but when I go to scan it comes up with the boxes I said before. Quite lost at the moment? Thanks Maureen. PS I have unstalled and reinstalled

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Did you install Toolbox? Not sure? Assuming this is Windows, click Start, All Programs, Canon. Look for open CanoScan Toolbox (4.9 I think). Once this is open, click the 'Settings' button. There should be a drop-down menu for 'Select Scanner'. Make sure this shows the CanoScan LiDE 25. If that scanner is not listed, then the scanner driver is not being seen or may not be installed.

Once it has been verified that the LiDE 25 is selected, click OK. Next, click the 'Save' button. Check the box for 'Display the Scanner Driver'. Now click the 'Scan' button at the bottom.
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If there was a particular application you were trying to use and you are still having issues with it, please give those details.

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