Question about HP 48gx Calculator

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Non functional keys

The entire far-right column of keys does not function. Pressing any of these keys (NXT, right-arrow, 1/x, delete, divide, multiply, subtract, add) just does nothing. I don't recall doing anything to the calculator (no drops, spills, etc.).

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  • CalcNotWrkn Dec 03, 2007

    I have the same problem, but with only 3 keys (1/x, y^x, sqrt). I've found in other forums that this is a common problem for this model as it gets older. I found one set of instructions to take the calculator apart and clean the contacts, but the instructions are not clear and it sounds like it's easy to cause alot more damage.

  • dhayes255 Jan 07, 2009

    Same problem here. Looking for a solution.

  • wal_y_fipe Feb 09, 2009

    I have the same problem, even after doing the soft reset and the keyboard testing. However, mine is for a whole line from top to bottom.



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HP 48SX and HP 48GX calculators have a membrane which connects between the internal circuit boards. This is a common failure point. The "ON" button is often the first button to go out. The calculator can be opened up can cleaned, but it is a little involved. Forutnately someone has posted pictures and information on what to do.

There is a text file with information. The file is big because of the pictures. Summary: Open the case, bend metal clips holding the circuit boards together. Clean up any dust and the contacts. Reassemble.

Posted on Mar 02, 2009


Don't use those keys

Posted on Apr 06, 2008


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Can not reset calculator. Keep getting + sign when press enter

If the TI-84 does not function even though you are sure that the
batteries are fresh, you can try manually resetting it by following steps:

1. Remove all of the AAA batteries from the graphing handheld

2. Press and hold the ON key for ten seconds

3. Replace the batteries

4. Turn on the unit

When you reset your graphing handheld, the contrast sometimes
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How to turn off the fn key

1 - Function Keys f1 through f122 - Configurable Function key fnDisable fn in the BIOSTo disable, or enable, the function key (fn) in the BIOS, do the following steps.
  1. Press the power button to turn on the computer.
  2. Press the f10 key to open the BIOS setup window.
  3. Use the right-arrow or left-arrow keys to navigate to the System Configuration option.c02035200.jpg
  4. Use the up-arrow or down-arrow keys to navigate to the Action Keys Mode option, and then press the enterkey to display the Enable / Disable menu.
  5. Select the desired mode:
    • Disabled : Requires pressing fn key + f1 through f12 to use the action as indicated on the action key.For example, if Disabled , pressing fn + f11 will mute the sound as indicated on the key on this model PC. Alternatively, pressing f11 only will minimize and maximize a web browser if open.The action keys may vary depending on the model of notebook.
    • Enabled : Requires pressing only f1 through f12 to use the action as indicated on the action keys.For example, if Enabled , pressing f11 only will mute the sound as indicated on the key on this model PC. Alternatively, pressing fn + f11 will minimize and maximize a web browser if open.The action keys may vary depending on the model of notebook.
  6. Press f10 key to save the selection and restart the computer.
The function key (fn) option can be reset at any time.

May 22, 2012 | HP Compaq Presario CQ57-229WM Notebook PC

1 Answer

How do i register my phone number into a used ux-p200

1 Press FUNCTION key once and DOWN ARROW twice.
2 Press RIGHT ARROW once.
3 Press RIGHT ARROW once.
4 Enter your fax number by pressing the number keys (max. 20 digits).
• To insert a space between digits, press #.
• To clear a mistake, press speaker .
5 Press START/MEMORY to enter the fax number in memory.
6 Enter your name by pressing number keys for each letter as shown in
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I need see the manual. for adjusted the clock

    • Turn the stereo off by pressing the "source" button on the bottom left corner of the stereo's face. Press the "function" button, the lower of the two buttons to the right of the stereo display, until the clock appears on the display. Press the arrow keys at the far right of the stereo's face to adjust the time. Use the left or right arrows to toggle between hours and minutes. Use the up and down arrow to increase or decrease the hour or minute numbers. Press the "function" button once you have set the display clock to the correct time.


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(Fn) key function


Fn or Function key is used for your F1 up to F12 keys. Ex. Fn+F5 is to turn on the wireless capability. Fn key is like a shortcut for the functionality of the machine. You can also adjust brightness by pressing Fn+Up or Down arrow and for the Volume Fn+Left and Right arrow.

Apr 29, 2011 | Lenovo IdeaPad Z360 Notebook

1 Answer

Hi, I wonder how to use a TI89 to graph a multivariable functions's 3D picture. Thanks.


First you must configure your calculator to perform 3D graphics
Press MODE
1.The first line shown is Graph. Unfold the hidden menu list with the right arrow and choose Graph 5:3D
2. Press ENTER to validate.

Now you must define the surface you want to draw
1. Press the [diamond] key then [Y=] to get a list of function names, the first of which is z1
2. Enter the following function (or your own) z1=(x^3*y-y^3*x)/390
( x cubed times y -y cubed times x) divided by 390.
3 Press ENTER.

Graph the function
Press the [diamond] key then [GRAPH]

The graphing screen displays progress in %. When it is finished you will see a weird sombrero.

Hope it helps

Mar 21, 2011 | Texas Instruments TI-89 Calculator

1 Answer

I need to know how to get to Table Set on the TI-85 because I need to find the x intercepts on the graph, but I can't find it. How do I get to it?

try this one:

(first). Set up a function in the TI85. how?
Step 1. Press the [Y=] key to open the function editor.
Step 2. Type in the function you want in the Y1= line.
Step 3. Press [2nd] [QUIT].

(second). Create a table of numbers using the Y1 function.
Step 1. Press [2nd] [TBLSET] to open the table setup menu. On the line "Indpnt", highlight "Ask" and press enter. On the line "Depend", highlight "Auto" and press enter.
Step 2. Now press [2nd] [TABLE] , type in a value for "X", and press [ENTER].
Step 3. Continue typing more values for X to fill up the table.

(third). How can I see more decimal places for the numbers in a table?
Step 1. Use the arrow keys to move the highlight over the number you are interested in seeing to more decimal places.
Step 2. Read the number at the bottom of the screen. You should be able to see anywhere from 9 to 14 significant figures for your number.

(fourth). Delete the numbers in a table by:

(The following procedure will work when the table setup has been set to ask for the values of the independent variable.)
Step 1. In the table screen, check the bottom of the screen to make sure that the cursor is not blinking at the bottom of the screen. If the cursor is blinking, press the [ENTER] key to stop the cursor from blinking.
Step 2. Use the arrow keys to move the highlight to the first number in the first column of the table (the "X" column).
Step 3. Press and hold the [DEL] key to delete the numbers in the first column of the table. The entire table should become clear with this procedure.

Thanks! I wish it can help you..

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1 Answer

Ringer off on line 2

To turn the ringer off (or on)
press the conf/ function key,
scroll to "ringer volume" using the up and down arrow keysand press the forward arrow key
press the down arrow key for line 1 and the up arrow key for line 2
select the desired ringer volume by pressing the up and down arrow keys or press the down arrow repeatedly till the screen says "ringer off?"
press the save key (right soft key) you will recieve a conformation beep.
you can exit programming mode by pressing the off key.

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Removing zeroes?

You're right in that the calculator thinks you have 19 data points. You need to delete the nine unwanted rows. After pressing EDIT, press NXT to bring up the second set of editing functions. Scroll down to each unwanted row and press B for -ROW to delete it.

Or else simply delete the Sigma-DAT variable in the current directory and start over.

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