Scanner in the pre-scanning detection after the prompt to open the lock switch, what is the cause of this, how to recover, the lock switch is open!

There are two cases, one is the pressure lock, the scanner is placed on a flat desktop that is automatically unlocked, pick up that is locked to protect the lens from damage during movement. The other is a manual lock, labeled: UNLook and Look two states, UNlook for the unlocked state, Look for the locked state. You start by looking at which state your lock is in. First you reset the scanner optical, then you lock the lock, scanner head down, see if the scanner head will slide down, if it slides that your scanner lock problem. If it does not slide, then open the lock to connect to the computer to try to see if the tip will appear.