Здесь _http://support.visioneer.com/KnowledgeBase/Articles/VIS1049%20-%20Problem%20Communicating%20with%20TWAIN%20Device.asp написано про некий Lock (замок, защёлка, переключатель), а вовсе не про кнопку... Расположена на дне.
Цитата:
Verify that the shipping lock on the scanner is in the unlocked (open padlock) position.
For all models except the Xerox 6400, the shipping lock is on the underside of the scanner.
For the Xerox 6400 the shipping lock is located on one side of the scanner glass bed.
If you have already unlocked the scanner, unplug the power and toggle the lock switch firmly 4 times, then plug the scanner power back in. Even though you may have already unlocked it, the hardware may not have fully disengaged the lock
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