Xerox 6400 - Manual (Page 15)

Installation
10 Xerox 6400 Scanner User’s Guide
6. Plug the power adapter plug into the power jack on the back of
the scanner and then plug the power supply into an AC (wall)
outlet.
The following diagram shows the scanner connected to a
computer.
7. Turn on the power switch on the back of your scanner.
The green status light on the front of the scanner is illuminated,
indicating the scanner is receiving power.
Your computer recognizes that a scanner has been plugged
into the USB port and automatically loads the appropriate
software from the CD to run the scanner.
Green status light