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None of the buttons in my fx-991ES PLUS are responding

All the buttons on my casio fx-991es plus randomly stopped responding, except the "on" button. I turned my calculator on and discovered that none of the buttons work, and I can even turn it off. I opened the calculator, removed the battery and put it back after sometime but still it just turns on and doesn't do anything. Is this some kind of malfunction or am I doing something wrong? Please help!

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

josh1856
  • 105 Answers

SOURCE: TI-83 Plus Problem

Batteries:
Make sure to replace the "battery backup" too the little lithium ion battery

Try Adjusting contrast:
Hold down "[2nd]" key press up or down arrow repeatedly to lighten or darken contrast.

First attempt reseting:
Step 1: Remove all the batteries
Step 2: Hold "Clear" key down
Step 3: Still holding "Clear" key reinstall batteries
Step 4: Still holding "Clear" key press "On" key until home screen is displayed.

Second shot reseting:
remove all batteries including lithium ion (backup battery), wait 3 hours and reinstall batteries.

Third Shot reseting:
Step 1: Remove a battery
Step 2: Hold down "DEL" key reinstall battery
Step 3: Possible msg pops up saying "Waiting ... Please install software" IGNORE msg and take out battery again
Step 4: Reinstall battery do not hold down "DEL" key

reseting will cause the handheld to loose all of its stored memory.

Hope that helps!

Posted on Jan 30, 2008

  • 4 Answers

SOURCE: None of the buttons on my TI-84 Plus calculator are working.

is the cursor the graphing cursor or the normal typing cursor?

Posted on Feb 22, 2008

  • 3 Answers

SOURCE: casio FX-9750G Plus won't turn on

I had the same problem too. I just bought it and I was trying to turn it on but it wouldn't though the manual said that it was supposed to automatically when the tab was pulled out. Good news: the Reset button on the back works. I pushed it for some time with the end of a toothpick and it worked.

hope it helps.

Posted on Jun 30, 2009

  • 37 Answers

SOURCE: Hi there, I have a

The calculator can't identify that this is a surd unless you input it as a surd, ie as 3/(4*sqrt(5))= when it will then show the equivalent form 3*sqrt(5)/20 (obtained by multiplying top and bottom by sqrt(5)) and you can swap between the two forms using the S<>D button. Even adding the next 4 decimal places (hidden) won't allow the calculator to identify the underlying surd as this is simply too complcated a calculation.

Posted on Jun 30, 2011

  • 37 Answers

SOURCE: how can i calculate log inverse with my fx-991ES

By 'log inverse', you presumably mean the inverse of the logarithm function. There are two logarithm functions on most scientific calculators. Firstly [ln], or natural logarithms, to the base e, where the inverse is e^x. Secondly [log], or logarithms to the base 10, where the inverse is 10^x.

Example 1 : ln(2) = 0.69314718 so e^0.69314718 = 2
Example 2: log(2) = 0.301029995 so 10^0.30102995 = 2

Posted on Oct 03, 2011

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1 Answer

How can I calculate combinations with fx-991ES PLUS?


Use nCr (the shifted function of the divide key). For example, to find the number of combinations of five things taken three at a time, press 5 SHIFT nCr 3 = and see 10.

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Combinations on fx-991ES


Press [SHIFT][ division key]. It is marked with nCr.

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Answers in log or ln form?


This is a good scientific calculator that can do a lot, but things in the realm of a CAS (Computer Algebra System) are beyond its capabilities.

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Is there a verify mode on the CASIO fx-991es plus calculator?


You should try to explore the calculator to find its capabilities. You can also read the manual. Everything is in it.
Press the Mode button, then the down arrow key. On the second page of the mode list you find 2:Verif

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Calculators fx algebra


The FX-991ES Plus barely handles simple operations on matrices of dimensions up to 3X3. It cannot find eigenvalues or eigenvectors.

Oct 24, 2013 | Casio Brand New-Fx-991es Plus - Scientific...

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Save equation fx 991es


In table Mode you can enter the formula for a function and generate a table of values. For a 991ES Plus you can enter two functions. However if you change MODE everything will be erased.
In EQN (equation) there is a certain number of built in formula types you can choose. You will be asked for the coefficients which will be used to solve the equation selected. However if you change MODE your lose what you entered. So basically you cannot save formulas to use as a memory aid (if that is what your intention is.) Sorry.

Jul 19, 2013 | Casio FX991ES Scientific Calculator

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How i can get infinity symbol in casio fx-991es plus calculator


You cannot. The calculator does not have a Computer Algebra System or CAS. If you are trying to calculate an integral over an infine interval, you must try some high values to simulate infinity and find a value after which the value of the integral stops changing .

Nov 16, 2012 | Casio Brand New-Fx-991es Plus - Scientific...

1 Answer

Casio fx-991es plus upside down display


I would take it apart and see if they installed the display upside down. I wouldn't think the wires would be long enough to do this, but maybe that is the way it is laid out.

Good luck.

Paul

Apr 07, 2012 | Casio Brand New-Fx-991es Plus - Scientific...

1 Answer

I have to buy Casio FX-991W Plus. No one has it. I checked eBay and the Casio web-site. I need that one. where can I get it from?


Hi,
If you cannot find it, buy an FX-991ES. It is solar-powerd and it has the natural text-book display, which is a novelty in calculators.
I know that Staples carry the FX-991ES.

Hope it helps.

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