Xerox DocuMate 632 User Manual page 11

Installation
6
5. Swing the input tray up until it snaps into place.
6. Plug the ADF cable into the ADF port on the back of the
scanner. Make sure the cable is plugged in securely. The ADF
will not work if the cable is loose or not plugged in.
7. Push the locking tab down to the 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.
8. 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.
9. Proceed to "Step 2: Install the Software."
DocuMate 632 Scanner User's Guide