The reason I ask is because my function keys "+", "-", "*" and "/" rarely work anymore. Sometimes if I hit them hard they will work but not always. I want to look at all of the contacts to see if there is anything I can do to resolve this issue. I can't find any screws to remove the top portion.
I've done a search, and only found how to open the HP 49. Someone posted that the 48 should open similar to the 49, but I can't seem to find the 6 heat points in the battery compartment to drill out.
Any help would be greatly appreciated.