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.).

Re: Non functional keys

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.

http://www.hpcalc.org/hp48/docs/opening/hprepair.zip

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

Re: Non functional keys - HP 48gx Calculator Calculators

Don't use those keys

Posted on Apr 06, 2008

Nothing of the sort. Just locate the EE key. You access it by pressing [2nd][x^-1]. It is the one below the [sin] function key.

To enter Avogadro's number

Key in

6.02 [2nd][x^-1] 23 [=/Enter]

If you divide by that number just enclose it between parentheses to ensure correct calculation.

You can also enter it as described 4 lines above, press the = key. The number will be displayed. To divide by it, press the [x^-1] key and its reciprocal will be displayed ready to be multiplied.

To enter Avogadro's number

Key in

6.02 [2nd][x^-1] 23 [=/Enter]

If you divide by that number just enclose it between parentheses to ensure correct calculation.

You can also enter it as described 4 lines above, press the = key. The number will be displayed. To divide by it, press the [x^-1] key and its reciprocal will be displayed ready to be multiplied.

Oct 30, 2013 | Texas Instruments TI 30XIIS Scientific...

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

changes. If the screen is faded or blank, adjust the contrast by

pressing**2nd** and releasing **up-arrow** or **down-arrow** keys.

batteries are fresh, you can try manually resetting it by following steps:

1. Remove all of the

2. Press and hold the

3. Replace the batteries

4. Turn on the unit

When you reset your graphing handheld, the contrast sometimes

changes. If the screen is faded or blank, adjust the contrast by

pressing

Feb 24, 2013 | Texas Instruments TI-84 Plus Calculator

Almost exactly as you wrote it.

2ND [LN] 1 8 5 ) / 2ND [LN] 1 7 2 . 5 ) ENTER

"LN" is the second function of the "X" key in the leftmost column of the keyboard. ")" is just above the "8" key.

2ND [LN] 1 8 5 ) / 2ND [LN] 1 7 2 . 5 ) ENTER

"LN" is the second function of the "X" key in the leftmost column of the keyboard. ")" is just above the "8" key.

Jul 19, 2011 | Texas Instruments TI-89 Calculator

On most calculators with a solver function, you can specify a starting value for the variable (in this case x) after pressing [Solve] but before pressing the = key.

To get the three solutions, try entering the function, pressing [Solve] then an estimated starting point (say 0.5 or 0.7) then [=]. This should show the +root2/2 result (ie 0.7071067812).

You should not need to enter the function again.

Follow this by pressing [Solve] again, then another estimated starting point (say -0.5 or -0.7) then [=] to get the -root2/2 result.

Similarly, then press [Solve] again, and enter another estimated starting point (say -2) then [=] to get the final solution of -3.

On Casio calculators, the [Solve] function is usually found by pressing [Shift][Calc]. Note that the solver function generally won't return numbers in surd form, only as a decimal value.

To get the three solutions, try entering the function, pressing [Solve] then an estimated starting point (say 0.5 or 0.7) then [=]. This should show the +root2/2 result (ie 0.7071067812).

You should not need to enter the function again.

Follow this by pressing [Solve] again, then another estimated starting point (say -0.5 or -0.7) then [=] to get the -root2/2 result.

Similarly, then press [Solve] again, and enter another estimated starting point (say -2) then [=] to get the final solution of -3.

On Casio calculators, the [Solve] function is usually found by pressing [Shift][Calc]. Note that the solver function generally won't return numbers in surd form, only as a decimal value.

Jul 07, 2011 | Calculators

Hello,

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

First you must configure your calculator to perform 3D graphics

Press MODE

1.The first line shown is

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

You press [alpha] then [f3] to open the func menu. Use the arrow keys to highlight logbase( and press enter.

then type in the value , base). Keystrokes would be [alpha] [f3] arrow and select logbase( , then [1] [(divide)

[4] [,] [4] [)] [=] . (your screen should look like logbase(1/4 , 4) = -1.

then type in the value , base). Keystrokes would be [alpha] [f3] arrow and select logbase( , then [1] [(divide)

[4] [,] [4] [)] [=] . (your screen should look like logbase(1/4 , 4) = -1.

Mar 04, 2011 | Texas Instruments TI-85 Calculator

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?

Answer:

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..

(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?

Answer:

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..

Feb 16, 2011 | Texas Instruments TI-85 Calculator

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.

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

Jun 30, 2010 | HP 50g Graphic Calculator

Hi,

Not every function on the TI83Plus calculator has a dedicated key, or is accessible through a key sequence. Among the keyless function is the factorial function.

**To access the factorial function**

**Syntax**

Type the number and use one of the foregoing access methods to echo the exclamation mark on the home screen and press ENTER.

Ex: 12! =479001600

The largest number that you can use with the factorial is 69.

Hope it helps.

Not every function on the TI83Plus calculator has a dedicated key, or is accessible through a key sequence. Among the keyless function is the factorial function.

- Through the catalog of commands: press [2nd][0] (CATALOG) and scroll Up till you reach the exclamation mark !
- Press [MATH]. Use right arrow to highlight PRB menu. The factorial function is the 4th in the list.

Type the number and use one of the foregoing access methods to echo the exclamation mark on the home screen and press ENTER.

Ex: 12! =479001600

The largest number that you can use with the factorial is 69.

Hope it helps.

Dec 06, 2009 | Texas Instruments TI-83 Plus Calculator

Hello,

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 wich 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 progess in %. When it is finished you will see a weird sombrero.

Hope it helps

First you must configure your calculator to perform 3D graphics

Press MODE

1.The first line shown is

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 wich 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 progess in %. When it is finished you will see a weird sombrero.

Hope it helps

Jul 18, 2009 | Texas Instruments TI-89 Calculator

Jun 01, 2014 | HP 48gx Calculator

Jun 01, 2014 | HP 48gx Calculator

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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.

Same problem here. Looking for a solution.

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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