For sure, the ON button is broken inside
I bet you have a program assigned to the OFF key. Is USER mode on?
TW
Hello,
(if your GX is old enough or if it was exposed to fine dust :-)
you may have the problem i had with old SX !
Just about under first row of keys there are contacts which connect your
calculator motherboard with keyboard PCB.
(that's why it seems to be working when you press ON-C you press the
keyboard PCB so it gets slightly closer to MBRD -that's why it seems to be
working in that case)
These contacts are just touching eachother making contact that's why this is
sensitive to dust.
note: if that's the case it will not get better, it will get worse and more
anoying so consider following...
possible fix :
take your GX apart, try to blow away the dust with highly compressed air,
(use high preassure so you won't move the dust around, you would rather blow
it out and away)
in case this doesn't fix the issue go further: separate keyboard PCB from
motherboard and clean properly
I don't recommend this if you're not experienced in taking things apart and
puting them back tougether (without permanent damage :-)
manjo
Try turning it on but pressing the metal cover just above the the "C"
key. (In fact, it worked better for my between the "B" and "C" keys)
If it works, the problem is that the main PCB might have loosen. You
can 1) Get used turning it on and off that way (althow you might
program another button for the off function) 2) Hit it hard by a side
with your hands hoping luck fix it (it worked to me in some 49Gs when
the screen became crazy) 3) Try open it and tighten the board again.
I recomend #1
Edwin
I posted almost the same, sorry I didn't read it until I finished.
Edwin, Thanks for the advice. I tried your suggestion of pressing
above the B and C keys and using the on/off button. That works
perfectly. Is there any reason to try the distilled water wash
suggested for dirty HP48's? I don't think mine has ever had anything
spilled on it but it is 10+ years old. Thanks.
Wow... I've never read anything about cleaning with distilled water...
Sounds creepy. I wouldn't try that, but maybe its better than opening
the hp... the scars never dissapear. However I don't think water could
be good for electronics... maybe try the compressed air suggested above
without opening the HP...
Edwin
Distilled water - which yearns fhe ions from your metal parts?
Why not sulphur acid right away?!
maybe:
Tap water rinse & dry with compressed air
Tap water would leave "dust" too or worst..
Imagine you get incrustations (such as when you boil water in a
recipient)... the you have to use Acetic Acid (CH3COOH)!!! (just
fooling around)
I say No to the water *idea*, nor acid!
Edwin
That's right Edwin,
say NO to water :-)
however if one would, and i'm not saying that one should,
take the calculator appart and wash it COMPLETELY in destiled water AND dry
it completely using
compressed air or blowdrier it should be fine.
if one considers to wash only partialy dissasembled unit one shoud be awarw
of this :
when you wash your unit with destilled water, water gets dirty from dust and
dirt from your calculator,
naturally it is no longer destilled water -it is rather like dirty rain
water.
When water is drying it would gather in very tight and hard-to-reach places
leaving there a nice cover of
dirt from the water, even more sticked to the PCB than it was before.
So you may easily end up creating more problems.
manjo
NOTE (Now for real):
Cleaning method is not critical at all, just make it clean and dry (by means
available or familiar to you), ensure good contact
between the boards. It will work like new !
the rest is mumbo-jumbo or in my case: brain-exercise :-)
> Distilled water - which yearns the ions from your metal parts?
> Why not sulphuric acid!
Jonathan Edwards?
> maybe: Tap water rinse & dry with compressed air
Tap water -- which deposits minerals on your PCB?
Why not iron filings :)
Or shampoo (Brother Joe's miracle cure :)
http://groups.google.com/group/comp.sys.hp48/msg/e43be0f52af1159a
Or leave well enough alone, and just press the case crown down :)
Uh-oh, that might be another instance of...
http://en.wikipedia.org/wiki/Cross_of_gold_speech
Note the "Yellow brick road" connection:
http://en.wikipedia.org/wiki/Yellow_brick_road
http://en.wikipedia.org/wiki/Political_interpretations_of_The_Wonderful_Wizard_of_Oz
The pure original speech:
http://www.h-net.msu.edu/~shgape/internet/crosgold.html
"You shall not press down upon the brow of labor this crown of thorns,
you shall not crucify mankind upon a cross of gold."
- William Jennings Bryan, July 9th 1896
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