48G keyboard weirdness



#2

Hi,
Got a 48G on eBay recently. Worked fine for a little while, but now the enter key is flaky, and in a strange way. Sometimes it won't work at all, sometimes it works, and a lot of times it will work if I keep it pressed down for anywhere between 1 and 10 seconds. Unfortunately, most of the time that it works it will count as multiple presses, usually two.

Any hints?


#3

Does pressing down on the bezel between the screen and the first row of menu keys help? If so, you may simply have an air-gap between the PCB and the keyboard connectors.

http://www.math.uiuc.edu/~handuong/hp48/repair/


#4

I tried that and it doesn't seem to make any difference. It's the occasional delayed activation that confuses me.


#5

Hi, Lincoln;

because the key has a 'motion irregularity', it seems to me it is a mechanical problem. The delayed activation may also be related to this as well.

Anyway, to remove any chance of software causes, can you save all of your data and clear calculator memory? You can also hardware reset the calculator by using the small hole in the back of it. Then you can try the key again and see what happens.

Not too much of a help, I know...

Success!

Luiz (Brazil)

Edited: 9 Jan 2010, 8:18 a.m.


#6

Quote:
... it seems to me it is a mechanical problem.

which one should expect from a 20 years old calculator even though I've got 5 of them working perfectly so far.


#7

Hi;

I have a 48SX, two 48G+ and two HP49G. All working fine... What the f... do we know, ahn?

Cheers.

Luiz (Brazil)


Possibly Related Threads...
Thread Author Replies Views Last Post
  HP-97 Weirdness Nick Taylor 1 230 07-26-2012, 04:17 PM
Last Post: Randy
  HP 20B Prediction weirdness? Joao S Veiga (Brazil) 22 1,195 05-14-2010, 09:30 PM
Last Post: Vieira, Luiz C. (Brazil)
  HP 35s keyboard weirdness Hiawatha Wheelwright 6 481 01-12-2010, 05:02 AM
Last Post: Bart (UK)
  HP 48GX and 48SX and 48G and 48S and 48G+ Mad Dog ebaycalcnut 2 285 04-17-2007, 08:55 PM
Last Post: James M. Prange (Michigan)
  HP41 card reader weirdness Les Wright 6 460 01-28-2007, 05:12 PM
Last Post: plasmoid
  48gx = 48g +96k ? = 48g+ +32k? Eric Lundgren 2 283 02-21-2005, 03:44 AM
Last Post: James M. Prange (Michigan)
  33S: nCr weirdness kc 10 639 05-20-2004, 08:40 PM
Last Post: Eddie Shore
  HP 41CV Weirdness - Sort of Long Wayne Stephens 4 363 05-03-2004, 10:55 AM
Last Post: Diego Diaz
  HP-41CV Keyboard/Behavior Weirdness Paul Brogger 4 339 04-04-2003, 09:30 AM
Last Post: Paul Brogger
  HP-25 display weirdness Jonas Otter 0 154 06-23-2002, 07:37 AM
Last Post: Jonas Otter

Forum Jump: