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Wednesday, January 21, 2015

Canon CanoScan LiDE70: Unable to connect to Twain Source

Though there are many decent apps like Cam2PDF/CamScanner etc which uses the phone camera to scan a document, nothing can replace a proper conventional scanner, especially if you are serious and want high quality.

Multi Function Printers (Scanner + Printer) are a waste of money. Instead get a slim flat bed scanner and a compact mono laser printer. Laser printers lasts much longer, especially if you print only occasionally. Inkjet printer head and cartridges dry up and get useless pretty quick, if used scarcely. I have a Canon CanoScan LiDE70 scanner and a basic Brother 1110 mono laser printer, going strong since years!

Usually Windows picks up drivers automatically for both devices. Recently I was trying to setup the scanner in a new laptop with Windows 7 64bit and ran into following error, when using the Canon Toolbox utility: Unable to open TWAIN source. Please check connection. Then re-start Toolbox!

Googling around a bit discovered that it is because the Toolbox software is not able to find the installed driver. You can fix this easily by adding the driver folder to the path.
eg: C:\Windows\twain_32\CNQ2411

So go to Computer -> Properties -> Advanced system settings -> Environment Variables -> System variables -> Path -> Edit and add the above to the end

Click all OKs and close the Properties, close and reopen the Toolbox utility. It should work fine now!

TIP: If the Toolbox is still not working, try going to 'Devices and Printers', right click CanoScan and 'Start scan' option.

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