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Unable to scan

Whenever i want to scan something pops up saying unable to detect twain source check connection and restart scanner

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  • jplusr Jan 03, 2009

    Yeah - right - just how many times must I uninstall - reinstall?
    10? 50? 100?

  • Anonymous Feb 02, 2009

    I have just changed operating system from windows 98 to windows vista and get the message about a twain connection missing what is the solution? norman

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Hi Franklin_mus,

Thanks for your posting in FixYa.

It seems to be the problem of the Drivers and incomplete installation. Please uninstall the Scanner and do a complete installation step by step.

Let me know if you need any further assistance from me. Have a Nice day.

Regards
ELLIN

Posted on Sep 20, 2008

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When i try to scan i get this message: unable to open TWAIN source Please check connection then re-start Toolbox the connections are tight


Driver mismatch - the driver of the scanner has forgotten the location of the TWAIN driver because another software has been using it lately. Follow this
http://weblogs.asp.net/jeffwids/archive/2009/11/02/canon-scanner-unable-to-open-twain-source.aspx

Feb 20, 2011 | Canon CanoScan LiDE 30 Flatbed Scanner

3 Answers

I have a Canon scanner 5000f. All of a sudden the computer won't recognize it and says it is "unable to select Twain Source." What do I do?


First you need to follow the instructions for installing the scanner. It is important whether you connect the scanner before the software is installed and whether you work from the new hardware found box or just install the driver as software. It sometimes varies between operating systems as well.

Sometimes the twain files can become corrupted. Since other devices like digital cameras use the twain files they aren’t erased with a driver uninstall or overwritten with an install. If the twain files are gone the driver install will also install them.

Uninstall ScanGear (I think that is the Canon driver software) and remove the scanner if it is still showing in device manager and control panel under scanners. Unplug the USB.
Do a search for twain and delete all you find in the Windows folder. There is probably a folder and several files – delete them all. Do not remove any twain files not in the Windows folder.
Dig out the instructions and reinstall the scanner exactly according to them.

Jan 14, 2009 | Office Equipment & Supplies

1 Answer

Error message


Hi toolpusher

Try going to CanoScan Toolbox > Settings and reset the 'defaults' button at bottom... this will restore factory settings and hopefully fix your problem... The other error message you can expect to get is "unable to scan - insufficent memory, check your **** space' (or something similar)... same fix works for both! ...Have had both messages on mine, sounds like a semi-regular conflict on some sort, but seems to be easily fixed. Good luck :-)

Sep 01, 2008 | Canon CanoScan LiDE 70 Flatbed Scanner

3 Answers

Unable to select TWAIN source


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.

Jun 24, 2008 | Canon LIDE20 Flatbed Scanner

1 Answer

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

May 22, 2008 | Canon CanoScan LiDE 25 Flatbed Scanner

2 Answers

Canon scanner


TWAIN is the type of scanner driver that is used for this scanner. It is probably the most common type of scanning driver.

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.
The next window that pops up should be ScanGear. If this happens, then everything is installed and the scanner is being detected properly. Attempt to scan or preview.

If there was a particular application you were trying to use and you are still having issues with it, please give those details.

May 19, 2008 | Canon CanoScan LiDE 25 Flatbed Scanner

1 Answer

Canon Flatbed scanner model D646U ex for Windows XP


Could be a problem with the cables themselves. Try a new set or different set of cables and see if this resolves the issue. Also make sure that you installed the correct version of the driver for your OS.
Should you still have difficulties, try a clean boot as explained below:
http://www.fixya.com/support/r545614-installation_problems_clean_boot_install

(Just replace "camera" in the procedure for scanner.)

May 15, 2008 | Canon CanoScan D646U Flatbed Scanner

1 Answer

Lock Switch and IF cable


Mine was doing the same thing. When I get on the program, before I click "acquire" to preview and scan, I click OFF the toolbox and then everything seems to be okay and I can go ahead and scan.

Nov 27, 2007 | Canon CanoScan LiDE 25 Flatbed Scanner

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