Question about HP 48gx Calculator

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Rs 232 port in the HP 48GX

Where can I send a couple of 48GX calculators to have the RS 232 port replaced? I use them as Data Collectors and from the repeated plugging and un-plugging of the cable, the pins either become broken or loose and the unit no longer communicates with the instruments or computer. Thanks for any or all help.

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Try http://www.fixthatcalc.com/. A friend of a friend sent his HP 48 in for repairs. You may want to check into them.

Posted on Nov 12, 2008

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Where is the rest button of a hp 48gx


Turn the calculator over. Remove the pad on the right (as you look at the calculator). In the recess there is hole marked R. Use a straightened paper clip and insert it in the hole. Replace the pad.

Jan 14, 2014 | HP 48gx Calculator

1 Answer

How can I graph Y=2X+3 on an HP 48GX? Thank you!


Enter the equation as 2*X+3. Make sure that the name of the independent variable X in the equation and that on the INDEP:X line are both Capital letters or both lowercase letters.

Aug 28, 2013 | 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

HP 48gx Calculator seems to turn on but display does not show


It might be too dim.
Turn calculator ON. Then press the ON button and hold pressure. Press the PLUS + repeatedly until screen darkens.

Nov 17, 2010 | HP 48gx Calculator

1 Answer

HP 48gx


If you are using the TDS software it may be in the backsight menu - try changing your angle to angle right- if not already set up that way - should work

Feb 22, 2008 | HP 48gx Calculator

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