Question about Casio Office Equipment & Supplies

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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Posted on Jan 02, 2017

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

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

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

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

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

You can't.

Feb 19, 2017 | Casio Brand New-Fx-991es Plus - Scientific...

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.

May 03, 2014 | Casio FX991ES Scientific Calculator

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

May 03, 2014 | Casio Brand New-Fx-991es Plus - Scientific...

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.

Apr 23, 2014 | Casio Brand New-Fx-991es Plus - Scientific...

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**

Press the Mode button, then the down arrow key. On the second page of the mode list you find

Mar 23, 2014 | Casio Brand New-Fx-991es Plus - Scientific...

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...

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.

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.

Jul 19, 2013 | Casio FX991ES Scientific 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...

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

Good luck.

Paul

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

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.

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.

Nov 27, 2008 | Casio FX-115W Plus Calculator

Aug 19, 2017 | Casio Office Equipment & Supplies

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