Posts: 84
Threads: 9
Joined: Jul 2007
Use a 1/8" drill bit and carefully hand turn out the four heat stakes around the battery compartment. Then use a popsicle stick or other flat wooden or softer plastic to work down the sides of the calculator. Just slowly work them down each side and only keep about a centimeter inside the case. You will need to dodge the middle side posts so you don't snap them off.
Once you get about two-thirds of the way to the bottom, you will then start prying the case to work those four heat stakes loose. It does require a fair amount of force, but the stakes will pop out with a loud snapping sound.
The first time I did this I was shocked at how much the case was bending; I used my fingers and, if you can bear it (OUCH), that would be a better way to pop it apart. But using wooden popsicle sticks (or plastic spoon handles) has worked great for me as well in other repairs I have done.
Be careful not to break off or bend the four corner and two side posts (visible in the first photo on the link you attached; these will help greatly when you press the calculator back together afterward.
After you do what you need to inside the case, just line up the six posts and press it together. It will hold together surprisingly well and give you access when ever you need to. Keep in mind though; OPEN THE KEYBOARD SANDWICH ONLY IF YOU ARE SURE YOU DON'T NEED THIS CALCULATOR ANY MORE. This thing is the weak link in this series of calculator and, when it is dead, it is dead.
