Top 20 Texas Instruments TI-86 Calculator - Page 8 Questions & Answers

The Screen Was knocked out of place, the problem is pretty much just a moved part from the drop. you should probably get someone to repair it. I do not recomend attempting to fix it yourself, this can result in even bigger problems with the calculator.

Having gone over half a year without a response to my query, I assume my suggested contrast adjustment solved the problem.

Don't you mean CR1616? The TI-86 can use either the CR1616 or the CR1620 battery. The -20 is slightly thicker than the -16 but there is enough flex in the system to accomodate it.

Having gone a month without a reply to my query, I assume the suggested contrast change fixed the problem.

Having gone over a month without a response, I assume this is no longer a problem.<!-- from fixya rte -->

Adjust the screen contrast. Turn on the calculator. Press and release the 2ND key, then press and hold the down-arrow key for a couple of seconds. If you go too far, use the 2ND and up-arrow keys.

Yes. Look in the calculus menu (2nd [CALC]). You'll find nDer, der1, and der2 for numerical differentiation and fnInt for numerical integration.

You'll find full details on these functions in the "Math, Calculus, and Test Operations" chapter of your guidebook. If you need a new guidebook, you can download it from http://www.education.ti.com

Adjust the screen contrast. Turn the calculator on. Press and release the 2nd key. Press and hold the down-arrow key for a few seconds until the screen lightens.

calculate it with another one and or talk to the teach!!

Use the ^ key, located just above the divide key. For example, to calculate two to the fourth power, press 2 ^ 4 ENTER

Having gone over a month with no response, I assume this is no longer a problem.

From the manual:

You entered an argument with an inappropriate dimension.
You entered a matrix or vector dimension less than 1 or greater than 255 or a non-integer.
You attempted to invert a matrix that is not a square matrix.

If you can't figure it out from here, please reply to this post telling us what you were plotting or attempting to plot when you got this error.

Turn the calculator on. Press and release the 2ND key. Press and hold the down-arrow key until the screen lightens.

I had the same problem as this. This is because when you might have changed the contrast on your calculator when your old batteries were running low and you need to reset the contrast. Here is what you do:

press the orange "2nd" button, then press the "down arrow" button, then the orange "2nd" button, then the "down arrow". do not press the buttons at the same time only one after the other and KEEP GOING. The screen will eventually lighten up and you are all set.

Use the root function in the MATH MISC menu.

To find the 5th root of 32: enter 5 then the root function and then 32 and then ENTER to get 2.

type as you see it

Turn the calculator on. Press and release the 2ND button. Press and hold the down-arrow key for a few seconds.

First, connect the two calculators with the unit-to-unit cable.

Prepare the receiving calculator: press 2ND [LINK] F2.

Select the item to send on the sending calculator: press 2ND [LINK] F1 F2. For each program you want to send, navigate to it using the up/down arrows and press F2. Press F1 to send.

Turn the calculator on. Press and release the 2ND key. Press and hold the down-arrow key until the screen lightens. If you go too far, press and release the 2ND key, then press and hold the up-arrow key.

Having gone over a month without a response, I assume it was just the screen contrast.