Question about Texas Instruments TI-89 Calculator
Calculator not registering when I press the 2nd key. Have tried both as the "2nd" key, and also using the CUT function. Button press feels like all the others as far as haptic feedback is concerned.
The 2nd key is not supposed to register anything. It puts the calculator in a waiting state until you press a valid key.
Posted on Dec 04, 2013
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Posted on Jan 02, 2017
SOURCE: TI 84 plus
I had the same problem. Found a posting on Youtub of someone messing up their TI-84 for fun by sticking a paper clip in it... One on the comments noted that dust in the data port can also cause it to not work right. I did not see anything dirt or dust on/in my TI-84. But I went ahead and took a can of compressed air and blasted the data port. Problem solved, it's been working fine ever since... If you have a receipt, and it's less than a year... TI replaces for free... other wise it cost $55 + $6 for shiping... 1-972-917-8324 is their number... Why it's not an 1-800.... I don't know... Hope this helps
Posted on Sep 26, 2007
give it a factory reset, this works, you will lose any unarchived data : http://www.associatedcontent.com/video/265/how_to_reset_a_texas_instruments_ti89.html?cat=59
Posted on Sep 03, 2008
Tips for a great answer:
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Press the [ON/C] key to turn on the calculator. Press the [OFF] key to turn it off. To use the calculator in solar mode, put the solar panel in the light and then press the [ON/C] key. To turn it off when in solar mode, slide the calculator cover back on and it will automatically shut off.
Replace the batteries by first removing the cover and placing it face down. Use a Phillips-head screwdriver to unscrew the back panel. Remove the back panel and change the batteries. Screw the back panel back on. Press [OFF] [ON/C] and [ON/C].
Use the basic operation keys for addition [+], subtraction [-], multiplication [x] and division [/]. To change the signs of your values from positive to negative or vice versa, press the [+ -] key before the numbers you enter. Use the parentheses, [(] and [)], to command the calculator to solve what is inside the parentheses first. Press the [=] to solve the number sentence you entered into the calculator.
Find percents of a number by first typing in the number, then [x], then the percent number, [2nd], [%] and, finally, [=]. The [2nd] key allows you to use the commands that are written above each key. For example, to find 20% of 100, type in 100 [x] 20 [2nd] [%] [=] and the display will show the answer, 20.
Turn decimals into fractions by entering the decimal value, then pressing the [2nd] and [F D] keys, then [=]. Turn the fraction back into a decimal by pressing [2nd] and [F D] again. For example, to turn 0.5 into a fraction, type in 0.5 [2nd] [F D] [=].
Turn mixed numbers into improper fractions by entering the mixed number first. Type in the whole number, then the [a b/c] key, then the numerator, the [a b/c] key again and the denominator. Next, press [2nd] [d/c] [=], and the calculator will convert your mixed number into an improper fraction. Press [2nd] [d/c] again to turn it back into a mixed number. For example, to turn 1 1/2 into an improper fraction type in 1 [a b/c] 1 [a b/c] 2 [2nd] [d/c] [=], and the display will show the answer 3/2.
Switch the notation setting of the calculator between engineering, scientific and floating. To select scientific notation, press the [2nd] and [SCI] keys; this will display your answers in scientific notation as a number between 1 and 10 to a power of 10. Press [2nd] [ENG] to switch to the engineering setting; this setting displays values as a number with an exponent that is a multiple of 3. Press [2nd] [FLO] to switch to the floating setting. This is considered standard notation and will display the answer as a standard number.
Use the left arrow key to go back and delete numbers to the right of the cursor that you typed into the display. This must be done before you press [=]. To clear the screen, values and operations, press [ON/C] and [ON/C] again in battery mode, or [CE/C] and [CE/C] again in solar mode.
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