Xerox DocuMate 752 - Manual (Page 9)

Xerox Scanner User’s Guide 5
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9. Slide the scanner locking tab to its unlocked position.
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.
10. When you’re finished assembling the scanner, place it on a level
surface on your desk. If the scanner is on an uneven surface, it may
stall when scanning from the Flatbed.