|Re: HP48 display problem (How to open a 48?)|
Message #6 Posted by Paul Brogger on 8 Jan 2001, 11:20 p.m.,
in response to message #4 by John Robinson
I've taken both of my -48G's apart, added memory, and put 'em back together, and they work fine.
HPCALC.ORG has a number of files that can be downloaded which describe memory upgrades for HP-48G's. Opening the calculator is a crucial 1st step. Search on "diassemble 48g" or "open 48G".
One thing, though: you DON'T need to take off the foil keyboard overlay on the front of the calculator. Some of the early directions suggested this step to release some melted plastic rivets that hold the case halves together -- it turns out it's unnecessary.
It's been so long since I've done it, I don't know which are the best directions, and I don't have time to wade through 'em all right now. (I took a cursory look, but I can't keep at it . . .)
My memory tells me I had to cut away some of the plastic posts from inside the battery compartment, release the front case at four or six points around its edge through tiny slots in the edge of the keyboard, and (I think) gently yank the thing apart to break the internal plastic rivets behind the keyboard. (This last part I'm a bit fuzzy about, because that's what I've done with my Pioneers, too.) In any case, DON'T take the foil off the front -- it'll never go back on as nice as it was!