Turn off and unplug the scanner.
Remove cover from scanner.
In between the holes that the cover posts go in, you will see a circular hole. Press a screwdriver down in this hole and the glass bed top of the scanner should slide back.
Remove the four screws in the top of the scanner that are revealed when you remove the scanner top. The cover of the scanner will now come off.
Remove the cover on the bulb. It is a plastic piece that just pops off.
At one end of the bulb holder, there will be an opening that allows you to reach under and pry the bulb up.
The bulb is a standard Phillips 8-watt daylight fluorescent bulb. It should be available at most lighting stores.
When placing bulb back in its holder, make sure it is firmly seated at both ends. The bulb should sit flush with the bulb retainer ends.
Place the plastic cover over the bulb.
Replace the top of the scanner and reinstall four screws.
Place scanner glass bed top in slots in scanner cover top and slide toward the front of the scanner until it clicks in place.
Replace the cover by inserting its posts into their respective holes.