Question about HP 48gx Calculator

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HP burn batteries too fast

I left my 48GX out in the rain. I let the thing dry before running it and thankfully turned on fine and worked! However later I found that it went through fresh batteries in a matter of 3 days even though the thing was shut off. Does anyone have a clue what could be wrong? how I can fix it? or who I can send it to to get fixed?

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There is an HP customer self repair (CSR) which you can contact. On the site it is sais that the service is available for products under warranty or on contract. but you have nothing to lose by contacting them. Here is the link to the web site
Hope it helps.

Posted on Nov 08, 2009

  • k24674 Nov 08, 2009

    You can also try this site. They do repairs on most models, except the newer ones.



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Toughbook CF-29 computer died

Torrential rain storm left out in it running? I'm sorry to say there is only one thing you can do for this laptop. "Do not turn it on at all again" Take the battery out of it and take it completely apart and use a blow dryer and dry everything out. "Everything" you may already be to late. Board may be shorted out and fried I hate to say it.
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1 Answer

My HP 48GX recently have ((.)) in the display. I thought that is the indicator of low battery. However, I replace battery new several times the same display still appears. Even after turn off...

Somehow an alarm got set. Execute the command ACK once and see whether the indicator goes away.

To enter the command, press and hold the ALPHA key, then press and release the A, C, and K keys in turn, then release ALPHA, and press ENTER. But you already knew that, didn't you?

Oct 25, 2011 | HP 48gx Calculator

1 Answer

HP 48GX Says "DUP Error:

Do you have anything on the stack? The DUP function duplicates the top element of the stack. If the stack is empty then you'll get this error because the calculator can't duplicate nothing.

Aug 22, 2011 | HP 48gx Calculator

1 Answer

48GX has been idle for 4 years.Wont turn on. Is there an internal battery that I can replace?

The 48GX runs on three AAA type alkaline batteries. However, if the device was unused that long, the button cells used for backing up the RAM cards may also be depleted, and the calculator will report "low battery" displaying the ((.)) symbol, even with fresh AAA cells installed.

The RAM card mounted batteries are type CR2016.

Main batteries:
  • Remove the calculator battery compartment door by pressing down and sliding it off away from the calculator.
  • Turn the calculator and shake the batteries out.
  • Replace with a fresh set of AAA alkaline batteries. Polarity is marked on the bottom of the battery compartment.
  • Replace the battery compartment door by sliding it back in place.
RAM card batteries:
  • Turn the calculator over and remove the plastic cover over the plug-in card ports (display-end of the calculator).
  • HP recommends to turn on the calculator while replacing the RAM card battery to avoid memory loss. I assume, your HP48GX has no marbles to recover by now anyway, so it does not matter, I guess.
  • Near the left side of the end of the card. you'll find the nail grip in the black plastic battery holder. Use a thumbnail to gently pull out the battery holder. There is one battery in each card (additional cards are options).
  • Remove the old battery from the holder and replace by a new CR2016 button cell. The "+" side of the battery should point into direction of the calculator's front.
  • Re-insert the holder with the new battery and check the RAM card is properly seated still.
  • Close the compartment by sliding back in the cover.

Jan 11, 2011 | HP 48gx Calculator

1 Answer

I left my Sony DSLR our in then .. it didnt rain for a long time. When I finally remembered and went to pick it up it was completely dry .. we didnt turn it on and we took the battery out immediately .....


You may keep it turned off until all the external parts and the battery compartments get dry. Furthermore, since the Camera has got wet in rain so there is possibility that rain water may have imbibed inside the Camera thus causing mechanical failure.

So, if the Camera doesn't turn ON even after drying it completely and charging the Battery fully. In that case, service will be required.

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Leapster left in rain

It might still be alright. Remove the battery, and put the leapster unit into a ziploc baggie along with some silica gel packs (those little packets that come with shoes and such that say "Do Not Eat") Leave it for a few days until the unit is fully dry inside. Then put the battery back in and give it a shot. We did this with a cordless phone that fell in the sink and it was fine!

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Too few arguments appeat when turn on the HP 48gx calculator


This calculator uses RPN (reverse polish notation) not algebraic notation.
If say you want to calculate 12+13, you proceed as follows
12 [ENTER] 13 + : the claculator displays 25
12 [ENTER] 13 x : displays 156

Also if you use a function like sinus or cosinus
12 [ENTER] cos displays the value (depending on the angle unit you are using).

I think you need to read a little more on the RPN before you get accustomed to this way of doing thing. The best reference is your calculator Getting started manual.

Hope it helps.

Jan 18, 2009 | HP 48gx Calculator

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