Visioneer One Touch 9420 - Manual (Page 14)

S TEP 1: A SSEMBLE THE S CANNER 7
4. Turn the scanner over and slide the lock tab to the unlocked
position. The scanner must be unlocked for you to continue with the
installation. It must also be unlocked to scan.
5. Proceed to “Step 2: Install the Software.”
Note: The locking tab protects the scanner’s scan head by holding it
securely in position. Lock the scanner when transporting it from one
location to another, but remember to unlock it before scanning. The
scanner will not scan when locked.