Here are 2 posts I found on another list:
Hey, I just had to figure this out myself as the glass on my scanner broke during shipping. First, pop off the small control panel facing piece that you had to snap into place when you first bought the printer. After that, there's a small square opening just below the green and gray copy buttons. Stick a small screwdriver (or pen/pencil) into that hole and push straight down. While pushing down, you should be able to slide that whole grey control panel section towards the front of the printer. Once you slide that off, you'll be able to access the 2 screws (the screw head is some type of polygon--I used the tip of scissors to unscrew) in upper right and lower right of the scanner glass frame. Pull the scanner cover door off and remove the screw in the upper left corner. You should now be able to pull off the whole frame and clean the glass, taking care not to stress the control panels wires.
Beware though--my scanner is not working now. It grinds for a few minutes during startup. I'm not sure if it's something I did or if there's broken glass in there jamming it up. If anyone has any suggestions, I'd love to hear.
Second post:
There is also a U shaped latch in the center of the top cover that needs to be released with a thin blade inserted from the front. It can be seen through the glass with a flashlight.
bill
mj
November 2004