Question about Canon CanoScan N656U Flatbed Scanner

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Downloading software (Twain??)

Have been using my N656U without problems on my Dell desktop.

Three years ago bought a Dell notebook and began using the desktop and scanner less and less.

Today decided to hook the N656U up to my notebook. No dice. When I went to load the softwarfe disk a msg indicated I needed to load Twain first in order to use the scanner.

Don't remenber any Twain, except that good ole boy, Mark

Appreciate any help in locating Twain.


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Re: Downloading software (Twain??)
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Re: Downloading software (Twain??)

I have a problem saying "Unable to open TWAIN server". How
can I get this resolved? Im' on XP system.

Posted on Feb 16, 2008

Re: Downloading software (Twain??)

The download website for your scanner is here:

A TWAIN driver is simply a generic scanner software driver that your specific Canon software can hook into and use.

I recommend starting with this one and see if it installs the TWAIN driver you need:

"CanoScan Toolbox v2.2.3 for Windows 98/Me/2000/XP"

Posted on Dec 16, 2007

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Want to download Canoscan N65OU Twain driver for my wndows 7 laptop. Any feedback would be useful. Thank you.

I have many years experience repairing Canon scanners and here is my suggestion for you.

I would first go to Canon's website which Im sure you have done already. If they don't have the current driver you need I would send them an email requesting the newest driver for your laptop. They are a very helpful company and im sure they will get you the driver you need.

I hope this helps you out.

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QUICK ANSWER: use the original USB cable that came with the scanner.

Using Vista (32 bit version) and a Canon N670U scanner with the new drivers installed from the CanonUSA website. This driver is works for Canon scanners: LiDE 20, LiDE 30, N670U, N676U and N1240U, found at

Canon says it doesn't support Vista 64 bit version. I couldn't get the scanner to work and kept getting the TWAIN error also, despite uninstalling / reinstalling the driver. Finally, decided to disconnect my 3rd party 16 foot USB cable and use the original cable. I swear, it WORKED! I can't explain why, but it did. Perhaps there is increased resistance, hence reduced power going to the scanner by using longer/different USB cable? Anyhow, it worked...go figure. If you have the 64 bit version of Vista, I guess it won't work(?).

Mar 24, 2008 | Canon CanoScan N656U Flatbed Scanner

1 Answer

"Unable to open TWAIN server" Please assist

track down the twain driver for that scanner.. thats the box that opens when you scan... google for the company, download the driver.. re-install tadahh.
Still no luck? manually remove the old one.. use search to finfd the twain folder in your windows system (prob twain32) then re-install.
Still no luck? Scanner has died.

Feb 16, 2008 | Canon CanoScan N656U Flatbed Scanner

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