Question about HP 48gx Calculator

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HP 48GX problem

My HP 48Gx won't turn off and when I press a key the display will show that number plus a zero.

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  • Anonymous Nov 04, 2008

    ...I just have the "won't turn off" problem....and I have a 48G



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  • 8,016 Answers

You can reset the calculator:

Turn the back of the calculator towards you. Extract the top left rubber pad on the back of the calculator and use a paper clip to press the Reset button. If that does not restore the calculator to health, you should perform the dagnostic tests.

The following procedure valid for the 48G should work for the HP48GX.
Make the calculator perform a
Self test.

  1. Turn calculator on
  2. Press and HOLD the key [ON]
  3. Press and release the key with "E" to its right (the one before last in first row)
  4. Relaese the [ON] key.
It tests the RAM and ROM. You will see various patterns on screen. Afterwards you should see
The self test will continue repeatedly until you perform a
System Halt
  1. Press and HOLD the [ON] key
  2. Press and release the "C" key
  3. Release the [ON] key.
The empty stack should appear.

If you do not see IROM OK and IRAM OK, the calculator requires service.

If the above procedure is successful, you may want
to test the keyboard.
  1. Turn calculator on
  2. Press and HOLD the [ON] key
  3. Press and release the "D" key.
  4. Release the [ON] key
  5. Press and release the "E" key. KBD 1 should appear on the top left corner of the screen.
  6. Starting at the upper left corner of the keyboard, and moving Left to right, press every key in sequence. If you follow the sequence and the keys are functioning properly you should hear a hight pitch sound at each press.
  7. If everything is OK, when you press the last key (+) the screen displays KBD 1 OK.
To exit the keyboard test proceed as described above under System Halt.

If you follow the proper sequence and a hexadecimal number appears after pressing a key, the calculator requires service.
Hope it helps.

Posted on Nov 07, 2009

  • k24674 Nov 08, 2009

    For repairs
    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

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



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Two ways to do this.

Press right-shift MODE, highlight BEEP, press +/-, then ENTER to save and exit. (page 4-6 of the manual)

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Will not turn on

Try the following, in order.

First, make sure you have good batteries and that they're in the right way (I can't count the number of times I've put the batteries in the wrong way on my 48GX).

Press and release ON, then press and hold ON and press + several times to see whether anything shows up on the screen.

Press and hold ON, then press A and F simultaneously. Release A and F, then release ON.

Turn the calculator over. Remove the upper-right rubber foot. You'll see a small hole with "R" next to it. Insert a small paper clip or similar implement into the hole as far as it goes and hold for one second.

If none of the above have any effect then the calculator needs service.

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Example enter 27 degrees 28 minutes and 42 seconds
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To convert it to decimal degrees
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Press and hold the ON key. Press and release the "C" key on the top row. Release the ON key.

If that doesn't do it, turn the calculator over. Remove the top right rubber foot. Insert a straightened paper clip or similar implement into the hole as far as it goes and hold it for a second, then remove. Turn the calculator on. You may have to use the ON-C sequence described above.

Feb 06, 2013 | HP 48gx Calculator

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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?

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My son randomly punch keys on the HP 48G and when I grabbed it from him the screen went dim. I need to make it bright again. I hold down the on key while....was the teaser answer I on the google link.

  1. Turn calculator ON (just press the ON key if you do not see anything on screen).
  2. Then Press the ON key and hold pressure.
  3. As you keep the ON key pressed, press the [+ ,PLUS], and keep pressing it until the screen darkens.
Note: It may be due to the fact that the FixYa parser rejects the PLUS sign (that is why I am spelling it out)

Dec 18, 2010 | HP 48gx Calculator

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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

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Hi. I have 2 HP calculators (48S and 48GX)that both have the same problem. All of the soft keys, the on switch, and some function keys do not work unless I squeeze the calculator on the metal bezel just...

I suppose you can have them repaired, but I suggest you purchase an HP49G+ or an HP50g. I own a 48g and just bought a second hand HP49G+. It is something else: larger screen, 75Mhz processor, about 1.5Mb RAM, an SD card slot (up to 2Gb), RPN, algebraic, and CAS modes, USB and IrDA connectivity, etc.You can even make them work as a 48gx with software from HP web site.
Note that repairing two discontinued models, with the possible scarcity of parts, may prove expensive.

Hope it helps.

Sep 13, 2009 | HP 48gx Calculator

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