Opening the case

text originaly written by Paul Smith

Disassembling the hp48
Despite the fact that that's pretty scary, I will entail what I know here. Thanks to David Holmes for taking the first step and helping make my attempt more informed.
None of the information that follows came from hp, so if what I say starts to sound rather official, it's not.
For the few folks out there who've actually had to send their hp48 back to hp for service, you probably ended up with an entirely new unit. I suspect the reason for this, aside from some labor cost savings on the part of hp, is that they really aren't much fun to take apart. You can draw your own conclusions as to why it was designed that way.

Backup your memory.

You will need to remove the batteries for a while to disassemble the unit, and you may have them out long enough to cause memory loss (although in my case, even 2 days didn't wipe anything out).

Moreover, you will remove the original ram chip! If you manage not to loose the memory, you are not born on this planet!!