To debug you have to take off the first screw and then you'll see 4 small screws on each corner. Unscrew those and pull the 2 pieces of your tama apart.
You'll see all the circuits and stuff. near the bottom you should see a circle that says DEBUG above it.
Take a wood pencil and rub that area a lot with the tip. put your tama back together and if you did it right, you should see an egg that seems to be moving VERY fast. If not, try again.
Trust me! this works on all 3 versions of tamas! ^_^