Question about HP 48gx Calculator

1 Answer

I haven't turned on my HP 48GX calculator for more than 1 year and I cannot turn it on now even I change the new batteries. I hope you can help me, thanks.

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  • HP Master
  • 7,993 Answers

It may just be a matter of adjusting the contrast of the screen.
Make sure batteries are good. Press and HOLD the ON key. Press + to increase contrast OR - to dim the screen.
At the end of the post you will find a link to a repair shop, but first I suggest you perform the following tests.

Warning
In the keyboard test (below), make sure the keys are pressed in the right order. If the calculator fails the keyboard test then it needs repairs. (Ignore the beginning of the post and skip to the last part For Repairs )

You can reset the calculator:

Turn the back of the calculator towards you. Extract the top right rubber pad (when you are looking at the back of calculator ) 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 diagnostic tests.

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. Release the [ON] key.
It tests the RAM and ROM. You will see various patterns on screen. Afterward 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 high 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.-

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

Posted on Aug 24, 2010

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Posted on Jan 02, 2017

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1 Answer

Turning off the beep on a 48GX hewlett packard


Two ways to do this.

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

Turn off flag 57. (page D-6 of the manual)

If you need a manual, you may download a copy from HP 48gx Graphing Calculator Manuals

Dec 06, 2016 | HP 48gx Calculator

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

I have replaced battery new several times after alarm message. However, the same alarm will still come out even I turn off the calculator. Thanks,


Alarms have nothing to do with the batteries.
To delete alarms, press right-shift TIME [OK] to bring up the alarm catalog. Highlight the alarm you want to delete and press [PURGE].

Full details are in "Time Management", Chapter 26 of the User's Guide.

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

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

2 Answers

My HP 48G does not come on.


Hi,
Warning
In the keyboard test (below), make sure the keys are pressed in the right order. If the calculator fails the keyboard test then it needs repairs. (Ignore the begining of the post and skip to the last part For 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.

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.-

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.

Hope it helps and Thank you for using FixYa.
Do not forget to rate the solution.

Nov 29, 2009 | HP 48gx Calculator

1 Answer

I just changed the battery in my HP 48GX that I haven't used in some time, but the alert symbol is on and nothing else is happening


Hello,
The following procedure valid for the HP 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.

Nov 07, 2009 | HP 48gx Calculator

1 Answer

HP burn batteries too fast


Hello,
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.

Dec 01, 2007 | HP 48gx Calculator

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