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!
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
SOURCE: TI-83 Plus Problem
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
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
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
Tips for a great answer:
May 03, 2014 | Casio FX991ES Scientific Calculator
Mar 23, 2014 | Casio Brand New-Fx-991es Plus - Scientific...
Jul 19, 2013 | Casio FX991ES Scientific Calculator
Nov 16, 2012 | Casio Brand New-Fx-991es Plus - Scientific...
Apr 07, 2012 | Casio Brand New-Fx-991es Plus - Scientific...
Nov 27, 2008 | Casio FX-115W Plus Calculator
Aug 19, 2017 | Casio Office Equipment & Supplies
20 people viewed this question
Usually answered in minutes!