Can't scan from wireless networked Pixma MP640

I just hooked up a new Canon MP 640 via wireless network through my Airport Extreme. Printing works fine, but when I try to scan to my Macbook the printer can't find it over the network. It will only scan to the Macbook with a direct USB connection. I can't find any documentation that suggests that scanning doesn't work over a network connection. Any help?

First of all, even though you mention network scanning, I am not sure if you have the printer using the internal wireless support or if you have it connected to the USB port of the Airport Extreme. Some users interpretation of network connections vary. So if you do have it connected to the USB port of the Extreme, then scanning is not supported. This is a limitation of Airport devices.
If however you have configured the MP640 to connect to the Extreme via wireless and you are trying to initiate the scan from the MP640 to the Mac using the Scan button, then you need to have the [Canon IJ Network Tool v2.70|http://support-au.canon.com.au/contents/AU/EN/0200080802.html] installed on the Mac.
Also, if you want MP Navigator to open when you use the MP640 Scan button, you need to install [MP Navigator Opener v3.0|http://support-au.canon.com.au/contents/AU/EN/0200087801.html] on the Mac.
Note that for the network scanner, there should be a separate MP640 entry under the heading of Scanners within the list of devices in Print & Fax. With this MP640 selected, you will have the Open Scanner button visible in the right hand pane. If you click this button, the MP640 scanner window will appear and attempt to connect to the AIO. Does this occur for you?

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