Question about Texas Instruments TI-68 Calculator

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Parts of display don't work

Calculation ok but some vertical rows of dots matrix not displayed. It is very hard to read...

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  • JackRaven May 08, 2008

    I actually have two of these calculators, both with the display problem.

    I like the logic and layout of these calculators and TI should make a "new" one with the same layout etc. It's probably just the display.



    JackRaven Metrologist

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You can try opening up the calculator (an exercise in itself, need to pry it open - use a plastic prying implement if you don't want to damage the edges) and you will see the display attached to the main board with a film ribbon. Believe it or not, this is GLUED to the board. You can sometimes bring these back to life by applying heat to the join from a hair dryer. This will soften the glue and remake the connection. This worked for me once, but it was delaying the inevitable and mine is now both broken and lost :(

Posted on May 09, 2008

  • 1 more comment 
  • tairu Jul 29, 2011

    very good hint, I've tried with a small hot air generator and now the display works great! I suggest not to go beyond 150°C
    ciao - arturo

  • Franck Franck Dec 13, 2012

    I'd like to add that I have just fixed my TI-68 with the exact same problem by doing the above. Many thanks for posting! I love my TI-68 :o)

  • ChrisM Mar 30, 2013

    This worked for me as well. I was about to throw it away and stumbled on this. Had to re-apply heat several times though, raising the dead so to speak :)

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1 Answer

Matrix entering and constants


Sorry to be the bearer of bad news, but the HP 10S calculator does not perform matrix calculations.
You have 9 variables A to F, M, X and Y. You can use them to store data, constants, calculation results, and other numerical values.
To store say the value 5674 in Variable A you press the key sequence 5 6 7 4 [SHIFT] [STO] A.
To recall the value stored in A (and use it in another calculation) you press [ALPHA] [A]. It will be displayed and you can do with it any calculation you want.
You can enter (store) data in Statistics modes
  • Mode 2 is for standard deviation SD (1-variable statistics)
  • Mode 3 is for Regressions.
You will have to read the manual starting from page 23.

Sep 23, 2013 | HP 10s Scientific Calculator

2 Answers

Lines on display, numerous horizontal, 3 vertical


This problem is caused by a defective LCD display. It is a common problem too. The only way to repair it is to replace the LCD display.
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Dec 20, 2012 | Garmin nuvi 1450 GPS Receiver

1 Answer

Hi my name is paul and I'm trying to get more help for Statistics, there was help for finding mean, but i can't find help for standard deviation. Also, for another professor I can't figure out, by the...


Here is some help. Please read both parts attentively.

TO COMPUTE STANDARD DEVIATION AND 2-VAR STATISTICS.

I assume you know the theory. I will show you the key strokes

For 1-Var statistics
Press [MODE][3:STAT] [1:1-VAR]. You are ready to enter values in the X column.
Enter a number and press [=]. Cursor jumps to second number to enter.
Keep entering numbers and pressing [=] till all numbers are in. Press the [=] key after the last one.
Press [AC] key to clear the screen.
Press [SHIFT] [STAT] (above digit 1.) then [5:Var]. Screen displays the statistical variables 1:n ;2: x bar; 3: x sigma n; 4:x sigma n-1.
Press the number corresponding to the statistical value you want, ex 1:n . The variable appears on screen. Press [=] and it will be displayed.
To display another variable press [SHIFT][STAT][5:Var][ 1,2, 3, or 4] .

To access the sum of squares sigma x^2 and the sum of data sigma x press[SHIFT][STAT][4:SUM] then [1: for sigma x^2] or [2: for sigma x]. Press [SHIFT][STAT][6:MinMax] to access minX and maxX.

For 2-var statistics
To perform 2 variable statistics you press [MODE][3:STAT] and any of the other regression options (except 1:1-Var). A two column template opens where you enter the X and Y values. When finished entering data, press [SHIFT][STAT][5:Var]. to access the different statistics. As I assumed above, you should be able to recognize what each variable means.

ABOUT MATRICES

This post is rather exhaustive as regards the matrix capabilities of the calculator. So if the post recalls things you already know, please skip them. Matrix multiplication is at the end.

Let me explain how to create matrices. (If you know how to do it, skip to the operations on matrices, at the end.)

First you must set Matrix calculation
[MODE][6:Matrix]. Then By entering one of the numbers [1:MatA] or [2:Matb] or [3:MatC] you get to choose the dimensions of the matrix
(mxn]. Once finished entering the matrix you clear the screen.
The operations on matrices are available by pressing [Shift][Matrix]
[1:Dim] to change the dimension of a matrix (in fact redefining the matrix)
[2:Data] enter values in a matrix
[3:MatA] access Matrix A
[4:Matb] access Matrix B
[5:MatC] access matrix C
[6:MatAns] access the Answer Matrix (the last matrix calculated)
[7:det] Calculate the determinant of a matrix already defined
[8:Trn] The transpose of a matrix already defined

To add matrices MatA+MatB (MUST have identical dimensions same m and same n, m and n do not have to be the same)
To subtract MatA-MatB. (MUST have identical dimensions, see above)
To multiply MatAxMatB (See below for conditions on dimensions)
To raise a matrix to a power 2 [x2], cube [x3]
To obtain inverse of a SQUARE MatA already defined MatA[x-1]. The key [x-1] is the x to the power -1 key. If the determinant of a matrix is zero, the matrix is singular and its inverse does not exit.

Dimensions of matrices involved in operations must match. Here is a short summary

The multiplication of structured mathematical entities (vectors, complex numbers, matrices, etc.) is different from the multiplication of unstructured (scalar) mathematical entities (regular numbers). As you well know matrix multiplication is not commutative> This has to do with the dimensions.

An mXn matrix has m rows and n columns. To perform multiplication of an kXl matrix by an mXn matrix you multiply each element in one row of the first matrix by a specific element in a column of the second matrix. This imposes a condition, namely that the number of columns of the first matrix be equal to the number of rows of the second.
Thus, to be able to multiply a kXl matrix by am mXn matrix, the number of columns of the first (l) must be equal to the number of rows of the second (m).

So MatA(kXl) * MatB(mXn) is possible only if l=m
MatA(kX3) * Mat(3Xn) is possible and meaningful, but
Mat(kX3) * Mat(nX3) may not be possible.

To get back to your calculation, make sure that the number of columns of the first matrix is equal to the number of rows of the second. If this condition is not satisfied, the calculator returns a dimension error. The order of the matrices in the multiplication is, shall we say, vital.

Apr 14, 2011 | Casio FX-115ES Scientific Calculator

1 Answer

How to use matrix in the calculator


Let me explain how to create matrices. (If you know how to do it, skip to the operations on matrices, at the end.)

First you must set Matrix calculation
[MODE][6:Matrix]. Then By entering one of the numbers [1:MatA] or [2:Matb] or [3:MatC] you get to choose the dimensions of the matrix
(mxn]. Once finished entering the matrix you clear the screen.
The operations on matrices are available by pressing [Shift][Matrix]
[1:Dim] to change the dimension of a matrix (in fact redefining the matrix)
[2:Data] enter values in a matrix
[3:MatA] access Matrix A
[4:Matb] access Matrix B
[5:MatC] access matrix C
[6:MatAns] access the Answer Matrix (the last matrix calculated)
[7:det] Calculate the determinant of a matrix already defined
[8:Trn] The transpose of a matrix already defined

To add matrices MatA+MatB (MUST have identical dimensions same m and same n, m and n do not have to be the same)
To subtract MatA-MatB. (MUST have identical dimensions, see above)
To multiply MatAxMatB (See below for conditions on dimensions)
To raise a matrixe to a power 2 [x2], cube [x3]
To obtain inverse of MatA already defined MatA[x-1] [x-1] is the x to the power -1 key
Dimensions of matrices involved in operations must match.
Here is a short summary

The multiplication of structured mathematical entities (vectors, complex numbers, matrices, etc.) is different from the multiplication of unstructured (scalar) mathematical entities (regular umbers). As you well know matrix multiplication is not commutative> This has to do with the dimensions.

An mXn matrix has m rows and n columns. To perform multiplication of an kXl matrix by an mXn matrix you multiply each element in one row of the first matrix by a specific element in a column of the second matrix. This imposes a condition, namely that the number of columns of the first matrix be equal to the number of rows of the second.
Thus, to be able to multiply a kXl matrix by am mXn matrix, the number of columns of the first (l) must be equal to the number of rows of the second (m).

So MatA(kXl) * MatB(mXn) is possible only if l=m
MatA(kX3) * Mat(3Xn) is possible and meaningful, but
Mat(kX3) * Mat(nX3) may not be possible.

To get back to your calculation, make sure that the number of columns of the first matrix is equal to the number of rows of the second. If this condition is not satisfied, the calculator returns a dimension error. The order of the matrices in the multiplication is, shall we say, vital.

Aug 06, 2010 | Casio FX-115ES Scientific Calculator

2 Answers

Textos distorcionados


Sympton: Horizontal misalignment of characters (Dots or characters move left or right from dot row to dot row or line to line)

NOTE: to check the phasing value, power down the printer, remove
the shuttle cover, and read the phase value on the aluminum
shuttle casting in a black marker. Should start with PH... You will need this number below!

IMPORTANT The printer must be printing the Phase pattern of “H’s” when the Phasing Value is changed, or the New Phasing Value will not be written into NVRAM. If the value is changed when not printing, the printer will return to its default phasing value when powered off then back on.

1. Raise the printer cover.
2. Install the ribbon.
3. Load full width (136 column) paper and set the top of form.
4. Power on the printer.
5. If the printer is on-line, press the ON LINE key to place the printer off-line. “OFFLINE / CONFIG. CONTROL.” displays.
6. On the control panel, press the = + > keys to unlock the ENTER key.
“ENTER SWITCH UNLOCKED” briefly displays. (If “LOCKED” displays,
simply press = and > again. This is the default key combination. The lock/unlock key combination can be programmed by the user. If = + > does not unlock ENTER, get the combination from the user.)
7. Press the ; key. “OFFLINE / DIAGNOSTICS” displays.
8. Press >. “DIAGNOSTICS / Printer Tests” displays.
9. Press >. “Printer Tests / Shift Recycle” displays.
10. Press ; until “Printer Tests / Phase Printer” displays.
11. Press ENTER. The display shows “Printer Tests / Phase Printer” and the test begins. The current phasing value is printed on the left of the printed pattern of all H’s. As the pattern prints, compare the H’s to the figure below. If the phasing needs adjustment, go to step 12. If the phasing is OK, go to step 15.
12. Press >: The current phase index displays. Press > again: An asterisk (*) appears next to the phase value.
13. Press < to increase or ; to decrease the phasing index value, then press ENTER to activate the value as it prints. Continue to increase or decrease the phasing index until the pattern of H’s is acceptable.
14. Press = twice: “Printer Tests / Phase Printer” displays.
15. Press ENTER to stop the test.
16. Press CLEAR. “OFFLINE / CONFIG. CONTROL” displays.
17. Press = + > (or the key combination set by the user). *ENTER SWITCH LOCKED” briefly displays.
18. Close the printer cover.
19. Press the ON LINE key to place the printer on-line.
NOTE: If you changed the phasing value, power down the printer, remove
the shuttle cover, and write the new phase value on the aluminum
shuttle casting.

Apr 26, 2010 | Printronix Line Matrix P5005B Printer

1 Answer

How to multiply two matricies?


Let me explain how to create matrices. (If you know how to do it, skip to the operations on matricies, at the end.)

First you must set Matrix calculation
[MODE][6:Matrix]. Then By entering one of the numbers [1:MatA] or [2:Matb] or [3:MatC] you get to choose the dimensions of the matrix
(mxn]. Once finished entering the matrix you clear the screen.
The operations on matrices are available by pressing [Shift][Matrix]
[1:Dim] to change the dimension of a matrix (in fact redefining the matrix)
[2:Data] enter values in a matrix
[3:MatA] access Matrix A
[4:Matb] access Matrix B
[5:MatC] access matrix C
[6:MatAns] access the Answer Matrix (the last matrix calculated)
[7:det] Calculate the determinant of a matrix already defined
[8:Trn] The transpose of a matrix already defined

To add matrices MatA+MatB
To subtract MatA-MatB
To multiply MatAxMatB
To raise a matrixe to a power 2 [x2], cube [x3]
To obtain inverse of MatA already defined MatA[x-1] [x-1] is the x to the power -1 key
Dimensions of matrices involved in operations must match.
Here is a short summary

The multiplication of structured mathematical entities (vectors, complex numbers, matrices, etc.) is different from the multiplication of unstructured (scalar) mathematical entities (regular umbers). As you well know matrix multiplication is not commutative> This has to do with the dimensions.

An mXn matrix has m rows and n columns. To perform multiplication of an kXl matrice by an mXn matrix you multiply each element in one row of the first matrix by a specific element in a column of the second matrix. This imposes a condition, namely that the number of columns of the first matrix be equal to the number of rows of the second.
Thus, to be able to multiply a kXl matrix by am mXn matrix, the number of columns of the first (l) must be equal to the number of rows of the second (m).

So MatA(kXl) * MatB(mXn) is possible only if l=m
MatA(kX3) * Mat(3Xn) is possible and meaningful, but
Mat(kX3) * Mat(nX3) may not be possible.

To get back to your calculation, make sure that the number of columns of the first matrix is equal to the number of rows of the second. If this condition is not satisfied, the calculator returns a dimension error. The order of the matrices in the multiplication is, shall we say, vital.

Mar 06, 2010 | Casio FX-115ES Scientific Calculator

2 Answers

I put my MatA and MatB but when I multiply them it displays a dimension erreor


I know this is a long time ago, but i am sure someone might ask eventually this same question.For the Casio fx-115es here are the instructions:go to mode, matrix, and pick the matrix you want to you.. you only have 3 options.create your matrix and press AC.Here is the tricky part, DO NOT go to mode again, that will reset your matrices that you have entered. Instead, press shift and the number 4 key, which is also matrix, go to press 1 (DIM), chose the other matrix to enter, and you can start mult, adding, etc.Any time you want to use the entered matrices, go through the matrix function, not the mode function.

Dec 12, 2009 | Casio FX-115ES Scientific Calculator

1 Answer

I need to know how to get to reduced row echelon form


Hello,
The matrix cell operations (row calculations, column operation) are accessed as follows:

Press [Menu] button. Highlight [MATRIX] icon and press [EXE]. The list of matrices is diplayed. If you already created the matrix, it will be listed and you can select it (using the arrows) and press [EXE].
Three menu items are displayed:
F1:R.OP (Swap, XRw,XRw->,Rw->
F2:ROW (Del, Ins, Add)
F3: COL (Del, Ins, ADD)

Matrix Operations are accessed in RUN screen by pressing [OPTN] and selecting [F2:MAT] . Availabble options ( they are commands) are
F1: Mat displays identifier Mat on screen
F2: M->L converts a matrix to a list
F3: Det Calclates the determinant
F4: Trn Calculates the transpose of a matrix
F5: Aug Augments a matrix
F6 -> accesses additional operations
F1:Iden Create an identity matrix with specified dimensions
F2:Dim
F3: Fill

In addition to the foregoing you have the matrix operations (+, -, x, square, inverse).
However there is an additional piece of software that performs the row echelon reduction on the CFX9850GBPlus. The information is available here (page 13: program ROWREDA)

The program can be downloaded from this site.

Hope it helps.


Aug 15, 2009 | Casio FX-9750GPlus Calculator

1 Answer

Dont know the contrast ratio of this tv


Specifications
Panel Type: 32" Diagonal (31.5" Viewable), 16:9 Wide Screen, Color TFT Active Matrix LCD
Panel Specifications: Anti-Static and hard coated surface
Pixel/Dot Pitch: 0.507mm (H) x 0.5107mm (V)
Display Compatibility: HDTV (1080i)
Signal Compatibility: 80i (SDTV), 480P (EDTV), 720P (HDTV), 1080i (HDTV)
Response Time: 8 ms (typical)
Colors: 8 bit 16.77 Million colors
Brightness: 500 cd/m2
Contrast Ratio: 5500:1 Dynamic Contrast Ratio
Viewable Angle: 178° (horizontal and vertical)

May 23, 2009 | Vizio VW32L 32 in. LCD HDTV

1 Answer

Gateway laptop vertical dotted lines across the screen


Sounds like a problem with the LCD assembly or cable. You may want to reseat the LCD cable at the LCD end. It could be a loose internal connector in the LCD assembly.
Ron-

Dec 13, 2007 | Computers & Internet

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