What a sad day! MyHP48G is no longer working at all, and my 49G is acting weird. All the buttons work except RightShift. LeftShift and Alpha. Is there anything that I am missing or is there a way to repair this?
Help, I've only got a 48GX left after this! ( I have been saving it for the Apocalypse)
Have you tried to see if pressing on the bezel near the bottom of the screen while pressing the shift keys on your HP48 "reactivates" those keys?
Awesome! I knew someone here would have asuggestion. I pushed on the bezel and can now access my shift keys. I guess this probably points to a loose connection or something, but this is good enough for now. I don't need the advanced menus very often, but now I can get to logs and shut it off when I am done.
Thank you so much!
(04-08-2015 12:55 PM)sad_hp Wrote: [ -> ]Awesome! I knew someone here would have asuggestion. I pushed on the bezel and can now access my shift keys. I guess this probably points to a loose connection or something, but this is good enough for now. I don't need the advanced menus very often, but now I can get to logs and shut it off when I am done.
Thank you so much!
The problem then is that there is a rubber support inside pushing the keyboard connector flex onto the PCB, this rubber tends to deteriorate.
Here is a thread that discusses the problem:
http://www.hpmuseum.org/cgi-sys/cgiwrap/...ead=151696
If you have a wish to try to repair it:
here is a guide to opening:
http://users.ju.edu/hduong/open/
and for repairing:
http://users.ju.edu/hduong/repair/
(about halfway down see "keyboard connector" and "Rubber Under Keyboard Contacts" which is the bit that has to be replaced).
(Note: the SX shown in the links above is physically the same as the GX)
Someone's temporary fix without opening the calculator:
http://h30499.www3.hp.com/hpeb/attachmen.../HP42S.jpg
(At least the programs can be saved before dis-assembly).
Best regards.
Opening old Singapore machines, using this technique, are VERY difficult. My 48sx from 91 refused to opening, even when I apply force, comparable to crack thing out
So, I remove metal overlay, and then drill those latches. Metal overlay in one place (near screen) was glued so tightly, that even hot hair-dryer flow cannot help - only thin knife helps. And even after that I get some little "waves" on the metal overlay under the screen. But, anyway, It works now!