The process for this varies from keyboard to keyboard, but generally you'll need to turn it on.
How to hook up a keyboard to a samsung tablet
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How to hook up a wireless keyboard to a tablet
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How to hook up a bluetooth keyboard to a tablet
There's a known error with some versions of the samsung galaxy tab and the official dock.
Connecting a keyboard is generally a simple affair, whether you're using bluetooth or a usb connection.
The quickest way to fix it is to follow this procedure:Power down the samsung galaxy tab completely by holding the power button and then selecting power off.
Once you make the connection, you should be able to begin using your keyboard immediately.