Question about HP 48gx Calculator

1 Answer

ON switch The ON and zero switches of my HP48GX don't work!. Sometimes appear a number zero in the screen, but it is impossible having it when necessary. Thanks a lot

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  • fabianromano Jul 11, 2008

    That is because the contact between the keyboard and the circuit is dirty or there is no enough pressure. Try pressing right below the screen (were the contact is) and press the key. If it works while pressing the front of the calculator below the screen then that's your problem. I had the same problem. When I figured it out I was so excited that I opened the calculator and out it together to fast that I broke something else, can't fix it. be careful

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  • HP Master
  • 7,993 Answers

Hello,
.The selft tests will show you what is wrong, and if the calculator requires repairs.

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
IROM OK,
IRAM OK,
HP48GX OK
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

    If calculator requires repairs,

    There is an HP customer self repair (CSR) which you can
    contact. On the site it is said 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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3deb58af-3d70-4f55-adc1-35b7c9392031.jpg
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7b3e81fc-c59c-455d-a5f2-e4b169925684.jpg
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