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
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
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