[Spktyr]

Consider buying an iPhone instead, which will not only do RPN in a calc app, it will link to your computer so you will never lose your information if the on-off switch dies.

As for the rest, my iPhone tells me that you can find HP48 repair information at http://www.hpcalc.org/hp48/docs/opening/

[null and void]

Consider buying an iPhone instead, which will not only do RPN in a calc appOh????????