Unlocking the Scanning Unit (LiDE 90)
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The scanner lock switch is located on the bottom of the scanner.
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To unlock the scanning unit, move the lock switch towards the unlock mark.
Important: To be sure the scanner has been successfully unlocked, cycle the lock switch back and forth and leave it in the unlocked position.
![](http://usa.canon.com/app/images/service_ware/Scanners/Scanner%20Lock%20Switch/Images/UnlockLiDE35.gif?tm=1108484198981)