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HP49G won't start!

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kurous

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Dec 12, 2004, 7:44:42 PM12/12/04
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Hi,
I've had my HP49g for about 3 years now (bought it for an engineering
degree). Have barely used it, was going to use it for an exam, so I bought
some fresh batteries and it just refuses to turn on. It loaded for a brief
moment, said it was tyring to recover memory, then started, but after
turning it off, went back to "dead" mode. Anyone had this problem before?
thanks


yoyo...@gmail.com

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Dec 12, 2004, 9:44:40 PM12/12/04
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try holding the "on" button, then pressing one of the function keys (i
usually use F1, but many of them work), then release both keys. mine's
been doing this forever, it's just proof that hp makes horrible quality
these days.

NC

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Dec 13, 2004, 6:28:00 AM12/13/04
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Try the Reset hole in the rear of the calculator. If this doesn't
work, try leaving the batteries out for over a day and see what
happens.

NC...

kurous

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Dec 16, 2004, 4:27:21 PM12/16/04
to
I tried both those things, thanks for your help, unfortuanately it still
won't start :(. Guess its dead...dead! It wasn't cheap either, and I liked
RPN, but I guess those damn TI-89 users get the last laugh now...

:(
"kurous" <kur...@whatev.com> wrote in message
news:_B5vd.494121$nl.121242@pd7tw3no...

NC

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Dec 17, 2004, 4:02:57 AM12/17/04
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One last resort. Perhaps your battery terminals aren't connecting
properly from the lack of not using it. Try exposing the metal
contacts with some sandpaper or similar.

NC...

Beto

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Dec 17, 2004, 9:22:33 PM12/17/04
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Maybe it has the capacitor problem?
Search google groups for this, because there was a website with
step-by-step instructions on how to change it. Of course some soldering
skills are needed.

Regards,
--
Beto
Reply: Erase between the dot (inclusive) and the @.
Responder: Borra la frase obvia y el punto previo.

Veli-Pekka Nousiainen

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Dec 17, 2004, 8:23:17 AM12/17/04
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"Beto" <beto_z_o....@hotmail.com> wrote in message
news:32g4nvF...@individual.net...

> kurous wrote:
>> I tried both those things, thanks for your help, unfortuanately it still
>> won't start :(. Guess its dead...dead! It wasn't cheap either, and I
>> liked RPN, but I guess those damn TI-89 users get the last laugh now...
X
Have you tried to roll the batteries (while in place) with your thumb?
--
VPN


Mike Gupton

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Dec 17, 2004, 9:16:52 AM12/17/04
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Have you installed any programs or libraries on your 49?
I once installed a library that was corrupt. The calculator would boot
and then either hang or shut off (I cannot remember exactly which).
Someone on this group told me how to boot it in a sort of safe mode,
remove the offending library and then re-boot. It worked. Perhaps if
VPN remembers the "safe mode" boot procedure, he can let us know. Mike

Veli-Pekka Nousiainen

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Dec 17, 2004, 9:44:18 AM12/17/04
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"Mike Gupton" <mwgu...@mts.net> wrote in message
news:1103293012....@f14g2000cwb.googlegroups.com...

I though it was the backspace key
but it seems to only inhibit the STARTUP sequence
in my hp 49g plus ROM 1.23
--
VPN


reth

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Dec 17, 2004, 4:52:57 PM12/17/04
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"Mike Gupton" <mwgu...@mts.net> wrote in message
news:1103293012....@f14g2000cwb.googlegroups.com...

If that's the case, here is the Joe Horn's solution (it's for the 49g+ but
should work on 49g either)

Just in case it isn't obvious, please be aware that it takes a fast
hand to do this correctly. You have to press and hold down the
backspace key IMMEDIATELY, the very moment that the warmstart begins.
This is much more difficult to do on a 49g+ than it is on a 49G.

If you can force a warmstart by pressing ON+C, then do it this way:
Press ON and hold it down, then press and release the C key (while
still holding down the ON key), then SIMULTANEOUSLY release the ON key
and press & hold the backspace key. Sounds complicated but it ain't.

If "Try To Revover Memory?" is displayed, then take a deep breath,
then press and release NO and IMMEDIATELY press & hold the backspace
key. This one's the most difficult; there can be no more than ONE
PRECISE INSTANT between pressing the NO key and pressing the backspace
key. A fraction of an instant is even better but is not required.

If the crash is so bad that none of the above work, then perform a
paperclip reset with the backspace key held down, which will force the
reset to pause midway with the screen turned on but blank. To resume
the reset and bypass your libraries, momentarily release the backspace
key and immediately press & hold it again. "Momentarily" means "of
duration greater than zero time and less than or equal to one precise
instant".

If the paperclip reset doesn't work, you can fake it into thinking
that you're going to update the ROM without actually doing so. Here's
how to do that: Press and hold BOTH the + key and the - key while
performing a paperclip reset. You will see the screen turn on but
remain blank. Release the + and - keys. You will see the ROM Update
menu (1:Update Code, 2: Self Test, 3:Secret Menu [hidden]). Press 3
to show the Secret Menu (actually it's the same one ordinarily
obtained by pressing ON+F). Now take a deep breath, press and release
ON and IMMEDIATELY press and hold the backspace key. This will force
the reset to pause midway with the screen turned on but blank. To
resume the reset and bypass your libraries, momentarily release the
backspace key and immediately press & hold it again.

ALL of these techniques will result in "DROP Error: Too Few Arguments"
or "Memory Clear" being displayed, and no libraries shown when you
press the LIB key. If libraries appear when you press LIB, you were
not fast enough; repeat the procedure more briskly.

Hope this helps!

-Joe-

"If at first you don't succeed, try, try again. And then give up.
Don't be a damn fool about it." -- Will Rogers


NC

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Dec 28, 2004, 8:01:17 AM12/28/04
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Kurous,

Did you end up getting your HP49G to work?

NC...

marrero88

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May 29, 2014, 4:59:41 PM5/29/14
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I'm not Kurous But i did it ... Thanks Reth


marrero88

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May 29, 2014, 5:00:03 PM5/29/14
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Franz

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Jan 20, 2017, 7:52:06 AM1/20/17
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Hi,
my 49g had this problem but now it will not turn on their own.
Also it does not have the paper clip reset.

Is there any way to recover?

Thanks

Irl

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Jan 21, 2017, 1:24:24 PM1/21/17
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Ont thing that was recommended for the 48 (but which will probably wipe the memory) is to fully discharge the internal capacitor after removing the batteries. And one can supposedly do that by installing the batteries backward and leaving it overnight. Then reinstall them correctly and see if you get any response to the ON button.

Joe Horn

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Jan 22, 2017, 7:06:17 AM1/22/17
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On Friday, January 20, 2017 at 4:52:06 AM UTC-8, Franz wrote:
> my 49g had this problem but now it will not turn on their own.
> Also it does not have the paper clip reset.

By "it does not have the paper clip reset" do you mean that it does not have a paper clip reset hole? That's not possible. Every HP48 has a reset hole, but you have to pry one of the rubber feet out to see it. Flip the 48 over, and using your fingernail, pry out the upper right foot. (Early 48S's and 48SX's had it under the upper left foot). The reset hole has a tiny "R" next to it, inside the foot hole. Poke it with a paperclip, and replace the foot.

If however you meant "a paperclip reset has no effect", then please let us know which of the solutions found in this thread you've already tried so that we won't repeat them to you needlessly.

-Joe-

Franz

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Jan 25, 2017, 9:49:58 AM1/25/17
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Thanke Joe,
I didn't found the paper clip reset hole, but now i found it. However I have not results, the calculator still does not turn on.
I tried every key combinations (ON+C, ON+A+F...) but i can't read anything on the screen... so I can't apply your suggestion explained in Rest's post.
I can only see the screen becomes black for a moment when I insert the last battery.
I suspect a hardware failure... :-(


Franz

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Mar 22, 2017, 7:54:03 AM3/22/17
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...no news or tips...? :-(

Eric Rechlin

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Mar 22, 2017, 1:39:20 PM3/22/17
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"Franz" wrote in message
news:6df5491c-1c11-4dee...@googlegroups.com...
> > I didn't found the paper clip reset hole, but now i found it. However I
> > have not results, the calculator still does not turn on.
> > I tried every key combinations (ON+C, ON+A+F...) but i can't read
> > anything on the screen... so I can't apply your suggestion explained in
> > Rest's post.
> > I can only see the screen becomes black for a moment when I insert the
> > last battery.
> > I suspect a hardware failure... :-(
>
> ...no news or tips...? :-(

Have you tried leaving the batteries out for a full week, just to ensure any
remaining capacitance is fully drained? That's the only thing I can think
of.

Eric

#5

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Apr 12, 2017, 9:26:16 PM4/12/17
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mine died, for not using for a long time, changed batteries aaa and the round battery as well, didnt work, sent to maitaneince and they said they could not to do anything so i bought an hp prime but i miss rpn

Joe Horn

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Apr 12, 2017, 11:23:09 PM4/12/17
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On Wednesday, April 12, 2017 at 6:26:16 PM UTC-7, #5 wrote:
> mine died, for not using for a long time, changed batteries aaa
> and the round battery as well...

The 49G doesn't have a backup battery. Perhaps your model was a 49g+?

> sent to maitaneince and they said they could not to do anything
> so i bought an hp prime but i miss rpn

I strongly suggest buying an HP 50g before they're all gone. It's almost identical to the 49g+ (with a few improvements), so you'll feel comfortable with it. And it's got RPN. Save your Prime for times when you need speed (it runs user-written programs roughly 200 times faster than the 50g).

-Joe-

Franz

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May 5, 2017, 5:06:33 AM5/5/17
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Yes, of course...

I suspect that some components (Diode D6 and L1 inductance) are faulty and I'm looking for a calculator electrical diagram, but I do not find it. Does anyone know how or where to find it?

thanks
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