Hi Silvestre,
So the carriage is locked in your scanner, usually the carriage lock on scanners is mechanical so you should try checking the bottom of the scanner and there is usually a switch there. I personally don't have this HP model scanner, but I have something similar, so this may help you in finding out where to unlock it the bottom. Follow this link:
http://h10025.www1.hp.com/ewfrf/wc/document?cc=us&docname=c00041061&dlc=en&lc=en&jumpid=reg_R1002_USEN#
Make sure to turn off the scanner and unplug it from the outlet when you move the carriage lock. You can try to move the switch a couple of times, and plug it back and see if after doing that you are now able to use the scanner.
Otherwise you may have to check with your scanner manual for further help, or call up HP Technical Support, since it's possible that it maybe a mechanical problem with the scanner.
Hope this helps!
Peace! :)
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