The scanner lamp comes on when it is plugged in, but goes into sleep mode when it has not been used for 15 minutes. The lamp comes back on when you scan.
Unplug the scanner when you have finished using it.
If you need to plug the scanner back in after unplugging it, wait at least 10 seconds before plugging it back in. Rapidly plugging in and unplugging the scanner can damage it.
Always lock the scanner carriage with the transportation lock before moving it; otherwise, the scanner may be damaged. Make sure the scanner lamp is in the home position (toward the back of the scanner) before locking the carriage. See “Transporting the Scanner” on page 54.
Connect the Scanner to Your Computer
Make sure your computer meets the system requirements listed on page 69 or 70. If you are connecting to a PC, Windows® must be factory preinstalled on your system and a
1.Locate the USB cable that came with your scanner.
2.Plug the square connector 
on the USB cable into the USB connector
on the back of the scanner. Then plug the flat connector 
into the USB port on your computer or USB hub.
USB port
6 Setting Up Your Scanner