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HELP!!!! My 48SX won't turn on!

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Eric Crampton

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Oct 24, 1994, 8:04:26 PM10/24/94
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The Alchemist (alc...@xmission.com) wrote:
: In article <38hc86$9...@xmission.xmission.com>, alc...@xmission.com (The Alchemist) says:
: >
: >I have a 48SX and recently, it completely stopped working. I can't even get a
: >rseponse when I turn the thing on... I have no idea how this happened and it
: >happened long enough ago that I cannot remember the symptoms it gave when it
: >died. Please help!

: Sorry, I should have mentioned: I tried installing fresh batteries too...
: Fortunately, I have a 48GX that I can use in reserve, but I'd love to get my
: older SX to work again!

Try ON-C, ON-A-F, etc. If those don't work, then try hitting that reset
button which is underneath one of the small rubber feet on the underside of
the calculator.

--
ecra...@csugrad.cs.vt.edu | "Our life is what our thoughts make of it."
Eric Crampton | -Marcus Aurelius

Trent Andrew Riggs

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Oct 24, 1994, 8:29:08 PM10/24/94
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In article <38hi2a$7...@csugrad.cs.vt.edu>, ecra...@csugrad.cs.vt.edu (Eric Crampton) writes:
|> The Alchemist (alc...@xmission.com) wrote:
|> : In article <38hc86$9...@xmission.xmission.com>, alc...@xmission.com (The Alchemist) says:
|> : >
|> : >I have a 48SX and recently, it completely stopped working. I can't even get a
|> : >rseponse when I turn the thing on... I have no idea how this happened and it
|> : >happened long enough ago that I cannot remember the symptoms it gave when it
|> : >died. Please help!
|>
|> : Sorry, I should have mentioned: I tried installing fresh batteries too...
|> : Fortunately, I have a 48GX that I can use in reserve, but I'd love to get my
|> : older SX to work again!
|>
|> Try ON-C, ON-A-F, etc. If those don't work, then try hitting that reset
|> button which is underneath one of the small rubber feet on the underside of
|> the calculator.

This just happened to my roommate not too long ago and here's what the people at HP said to try:

take the batteries out and leave them out for 2 days. Put them back in afterwards and it _might_ work. Apparently leaving the batteries out for 2 days causes the HP48 to reset something. It worked for my rommates, maybe it'll work for you.

By the way, where is this little reset button?

Trent Riggs
tar...@icaen.uiowa.edu

Jarno Peschier

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Oct 25, 1994, 10:16:18 AM10/25/94
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In <38hjgk$k...@news.icaen.uiowa.edu> tar...@icaen.uiowa.edu (Trent Andrew Riggs) writes:

>By the way, where is this little reset button?

Look in your manual...
(It's a little hole under one of the rubber feet at the back of the calc.)

JPSOFT
--
Jarno Peschier, jpes...@cs.ruu.nl, 125:3101/100.1@WEM, X:X8X/X1X.X@XiXo,
8X:X5X/X.X@XaXiXNXt, 27:2331/214.1@SigNet, 74:3108/102.1@QuaZie
___________________________________________________________________________
What was was, before was was was? Before was was was, was was is.

SERGIO ANDRES CAMARENA MARTINEZ

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Oct 27, 1994, 10:52:38 PM10/27/94
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alc...@xmission.com (The Alchemist) writes:

>I have a 48SX and recently, it completely stopped working. I can't even get a
>rseponse when I turn the thing on... I have no idea how this happened and it
>happened long enough ago that I cannot remember the symptoms it gave when it
>died. Please help!

yep... this thing tends to this once in a while...

Take out the batteries, let it in a warm (22~c), dry place about a week, put
in some fresh batteries...

Don't know why, but it seems it wants to have vacations .... :P

Blair Sandberg

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Oct 28, 1994, 10:51:21 AM10/28/94
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In article <38hc86$9...@xmission.xmission.com> alc...@xmission.com (The Alchemist) writes:
>From: alc...@xmission.com (The Alchemist)
>Subject: HELP!!!! My 48SX won't turn on!
>Date: 24 Oct 1994 22:25:10 GMT

>I have a 48SX and recently, it completely stopped working. I can't even get a
>rseponse when I turn the thing on... I have no idea how this happened and it
>happened long enough ago that I cannot remember the symptoms it gave when it
>died. Please help!

>-------------------------------------------------------------------------------
>The Alchemist Anthony Chavez
>email: alc...@xmission.com Salt Lake Community College
>ftp: ftp.xmission.com:/pub/users/alchemy/ CompuSci Technology Major (AS)
>-------------------------------------------------------------------------------
Another thing to try which was told to me by one of the design engineers:
take the batteries out, put them back in BACKWARDS for a few seconds, then put
them back in the correct way. This seems to reset something (unknown, but
something). I have gotten several hp's to work again doing this, even when
the reset button failed. This will reset your memory as well, but if its the
difference between a working and non working calc, what do you have to loose?

- Blair

Seth Arnold

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Oct 29, 1994, 11:33:23 PM10/29/94
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> Try ON-C, ON-A-F, etc. If those don't work, then try hitting that reset
> button which is underneath one of the small rubber feet on the underside of
> the calculator.

Why is it, ON-A-F is recommended before the button?

--
"I never let my public schooling get in the way of my education." --
Mark Twain

Seth Arnold

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Oct 29, 1994, 11:34:55 PM10/29/94
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> Look in your manual...
> (It's a little hole under one of the rubber feet at the back of the calc.)

I thought they didn't discuss it at all in there... wow.

The Alchemist

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Oct 31, 1994, 5:25:14 PM10/31/94
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In article <CyJ78...@cs.ruu.nl>, jpes...@cs.ruu.nl (Jarno Peschier) says:

>
>In <CyGv7...@agora.rdrop.com> hid...@agora.rdrop.com (Seth Arnold) writes:
>
>>> Try ON-C, ON-A-F, etc. If those don't work, then try hitting that reset
>>> button which is underneath one of the small rubber feet on the underside of
>>> the calculator.
>>
>>Why is it, ON-A-F is recommended before the button?

Ok, I tried ON-C, ON-A-F and punching the reset button under the footpad. None
of these worked... HELP!!!!!!!!!!!!!

Richard M Presley

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Nov 1, 1994, 3:01:05 PM11/1/94
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More specifically, with the calculator laying on its face, the reset hole is
under the top left foot. Just pry it out and look for the hole marked with an
"R". Use something narrow to stick into the hole to press the button.

Hope this help.

Later,
Rick P
rmp...@tntech.edu

Matthew Cravit

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Nov 1, 1994, 4:08:36 PM11/1/94
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In article <1994Nov1.1...@atlas.tntech.edu>, strange alien beings caused Richard M Presley (rmp...@tntech.edu) to write:

> More specifically, with the calculator laying on its face, the reset hole is
> under the top left foot. Just pry it out and look for the hole marked with an

Nope. On my G, at any rate, it is under the top RIGHT foot. (It would
be the left only if the calculator is right side up.)

/Matthew

--
Matthew Cravit N9VWG | "A child of five could solve
DePaul University | this problem...quick, fetch
Chicago, IL 60614 | me a child of five!"
crav...@interaccess.com http://www.interacces.com/users/cravitma

William J Levenson

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Nov 2, 1994, 11:54:44 AM11/2/94
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In article <CyMv4...@cs.ruu.nl>, Jarno Peschier <jpes...@cs.ruu.nl> wrote:
>
>Mmm, I never really looked myself, but I seem to recall that my manual
>said it was under the top *right* foot. Is this my lousy memory? Your
>lousy memory? Or did that hardware reset change place somewhere during
>production of HP48's?
>

Yes, it has moved in different versions of the HP48. To be sure, check
for the small letter "R" stamped into the plasic near the hole. I once
punched a hole in whatever is behind the "other" hole because pushing a pin
in there didn't reset the calc. So I figured I needed to push harder :-(
Unfortunately, I was using a safety pin and it punched right through whatever
is behind the "wrong" hole. <Embarassed expressing> Fortunately, no
apparent damage was done

Bill Levenson

Jarno Peschier

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Nov 2, 1994, 4:17:09 AM11/2/94
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>>>By the way, where is this little reset button?
>> Look in your manual...
>> (It's a little hole under one of the rubber feet at the back of the calc.)
>More specifically, with the calculator laying on its face, the reset hole is
>under the top left foot. Just pry it out and look for the hole marked with an
>"R". Use something narrow to stick into the hole to press the button.

Mmm, I never really looked myself, but I seem to recall that my manual


said it was under the top *right* foot. Is this my lousy memory? Your
lousy memory? Or did that hardware reset change place somewhere during
production of HP48's?

JPSOFT

Ed Hurtley

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Nov 2, 1994, 7:59:30 PM11/2/94
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Matthew Cravit (crav...@interaccess.com) wrote:

: In article <1994Nov1.1...@atlas.tntech.edu>, strange alien beings caused Richard M Presley (rmp...@tntech.edu) to write:

: > More specifically, with the calculator laying on its face, the reset hole is
: > under the top left foot. Just pry it out and look for the hole marked with an

: Nope. On my G, at any rate, it is under the top RIGHT foot. (It would
: be the left only if the calculator is right side up.)

It's under a random foot, I know someone with it under his lower left, and
my SX and GX both had/have it under the upper right...

: /Matthew

: --
: Matthew Cravit N9VWG | "A child of five could solve
: DePaul University | this problem...quick, fetch
: Chicago, IL 60614 | me a child of five!"
: crav...@interaccess.com http://www.interacces.com/users/cravitma

--
-----------------------------------------------------------------------
| Ed Hurtley | DOS 3.1, DOS 3.3, DOS 5.0, DOS 6.0, DOS 6.22 |
| e...@agora.rdrop.com | OS/2 2.01, OS/2 2.1, OS/2 3.0, Windows/NT 3.5 |
| Dat's a lot o' OS's | Windows 3.0, Windows 3.1, Windows/WG 3.11 |
-----------------------------------------------------------------------

Richard M Presley

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Nov 3, 1994, 2:41:24 AM11/3/94
to

Sorry about that! Right after I posted this, I was reading through the FAQ
again and noticed that it says that the Reset button location varies on the
different models. My SX has it under the foot that I stated. Next time I'll
research further before I respond!

Later,
Rick P
rmp...@tntech.edu

Seth Arnold

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Nov 4, 1994, 7:58:27 PM11/4/94
to

> >> Look in your manual...

> >I thought they didn't discuss it at all in there... wow.

> Another one that didn't read the manual... ;-}

well, they didn' tell about SYSEVAL in the Sx manuals... Not even in
the GX manual that ships with the calc. in no manual do I know of
written by HP do they discuss the RULES command (Look for it in the
AUR! It isn't there! :) So, I hope you can understand why I thought
this... they don't tell about some of the other better features, so I
thought they may have left this one out as well... :)

Richard M Presley

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Nov 8, 1994, 2:58:09 PM11/8/94
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I don't recall anything about it in the SX manual either, unless they put it in
later versions of the SX manual. My manuals are old, like my SX! :) Or maybe
there's something I haven't read in it!!!! Anyway......

Later,
Rick P
rmp...@tntech.edu

lpi...@gmail.com

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Mar 31, 2016, 11:49:58 AM3/31/16
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OK, folks...

In case this helps anyone else.

22 year after this post, it STILL is relevant!

My junior is using the same calc I used in high school. HP 48SX.
JUST today we needed to change the batteries. I don't remember changing them at any time in the past 20 years.
Well, the calc wouldn't turn back on. I was about to mourn a lost old friend.
Found this advice about reversing the batteries for a few seconds...

My old friend is resurrected!

Thanks so much, internet.
+ Loretta

paul

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Apr 3, 2016, 9:36:28 AM4/3/16
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[warning this is a last resort method only]

i once stuffed up my HP48g so bad that none of the usual methods
already described worked, so i rang my local HP fixit dudes in melbourne
here in Aust. they said take the batteries out & using a straightened paperclip touch diagonal terminals (2 battery contacts furthest apart)
& lo & behold when i but the batteries back it worked.

i would of course try every other solution before this drastic method.

pietro.g...@gmail.com

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May 14, 2020, 12:44:39 PM5/14/20
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Il giorno martedì 25 ottobre 1994 01:04:26 UTC+1, Eric Crampton ha scritto:
I kept stored the 48sx without batteries for years and it did not start when putting in the new batteries. I tried any reset procedure found in the internet with no results.

What worked for me was: putting only one battery (the top most one) and leave it for several days (maybe one week). All of a sudden, when I tried to add the other two batteries ... it went alive.

I don't know why ... but it worked.

optic...@mindspring.com

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May 15, 2020, 12:56:20 PM5/15/20
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HP calcs have a small amount of onboard energy storage, to maintain the clock and such while the batteries were being changed. This can keep the processor alive, and if it's in a stuck state it might not restart with new batteries. The solution for certain older calculators (I don't remember which) was to install (all) batteries backwards for a few days. This will quickly leak away the stored energy. Then when the batteries are replaced, it's a clean start and usually succeeds. I'm surprised that adding just one battery worked, but the currents are tiny and maybe there was enough leakage to do the trick.
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