Casio FX-991ES Support Question
Casio FX-991ES Support Question
Find answers below for this question about Casio FX-991ES.Need a Casio FX-991ES manual? We have 2 online manuals for this item!
Question posted by almuhseen24 on December 4th, 2022
For Some Reason, My Casio Fx-991es, Power On Button Refuses To Work. I Opened Th
For some reason, my Casio fx-991ES, power on button refuses to work. I opened the casing and took out the battery and replaced it and the calculator came on but when it switched off I had to remove and put in the battery again. All the other buttons are working.What's wrong with my on button and how do I fix it?
Current Answers
Answer #1: Posted by SonuKumar on December 4th, 2022 9:10 AM
SonuKumar
Member since:
May 9th, 2021 Points: 16,620,300
Member since:
May 9th, 2021 Points: 16,620,300
Here are some tips on how to repair your Casio fx 991es calculator. First of all you need to check the batteries. If the batteries are flat then replace them with new ones. If the calculator is still not working then there may be a problem with the calculator itself.
Please respond to my effort to provide you with the best possible solution by using the "Acceptable Solution" and/or the "Helpful" buttons when the answer has proven to be helpful.
Regards,
Sonu
Your search handyman for all e-support needs!!
Related Casio FX-991ES Manual Pages
User Guide - Page 4
... refer to the separate Appendix.
Initializing the Calculator
Perform the following shows an example of how...calculation mode and setup to their initial default settings. E-2 • The following procedure when you perform.
• The cursor key is represented in this User's Guide refer to the corresponding example number in the Appendix. Note that come with it . Moreover, CASIO...
User Guide - Page 5
Battery
• After removing the battery from the calculator, put it in a safe place where it will not get into the
calculator. • Use only the type of battery specified for later reference. If accidentally swallowed, consult with a physician immediately.
• Never charge the battery, try to take the battery apart, or allow the battery to become shorted.
Disposing of...
User Guide - Page 6
... or lost completely. Very low temperatures can cause memory contents to leave the calculator where it may require replacement sooner than the normal expected battery life.
• Low battery power can cause slow display response, total failure of the display, and shortening of the calculator. Heat can leak, causing damage to very high temperatures. If the...
User Guide - Page 7
E-5 k Adjusting Display Contrast
1N(SETUP)c6(]CONT') This displays the contrast adjustment screen.
k Turning Power On and Off
• Press O to turn on the display.
Replace the battery.
Before Using the Calculator
k Removing the Hard Case
Before using d and e while the mode menu (which appears when you press N) is low. After the setting is the way you...
User Guide - Page 9
...
STAT
BASE-N
EQN MATRIX
TABLE
VECTOR
(2) Press the number key that takes a long time to select. • To select the CMPLX Mode, for example, press 2. Calculation Modes and Calculator Setup
k Calculation Modes
When you want to execute, the display may show only the above indicators (without any value) while it performs the...
User Guide - Page 11
... be displayed in nonexponential format. only.
E-9 Outside the specified range, results are displayed using exponential format. The decimal point for input values is applied for calculation results
.
User Guide - Page 12
..., and division, functions, and parentheses. Example: 2 (5 + 4) - 2 × (-3) =
LINE
2(5+4)2*y3=
Inputting a Function with the open parenthesis ( ( ) character. Next, you input any of =.
k Initializing the Calculation Mode and Other Settings
Performing the following procedure initializes the calculation mode and other setup settings as they are written.Then simply press the = key to...
User Guide - Page 13
... omit one byte.
Omitting the Multiplication Sign You can omit the multiplication sign (×) in any of a calculation, immediately before the = key is displayed, you input uses up one or more information, see "Inputting with...to 14 characters at the end of the following cases. • Before an open parentheses (( ): 2 × (5 + 4), etc. • Before a function with Math Format".
User Guide - Page 17
... while Math format is
selected. • Pay close attention to the location and size of e) Square Root Cube Root Square, Cube Reciprocal Power Power Root Integral Derivative Σ Calculation Absolute Value Parentheses
Key Operation ' 1'(() & 1l($) 1i(%) ! 1!(#) w, 1w(x3) E 6 16(") 7 17(F) 1&(8) 1w(Abs) ( or )
Bytes 9 13 6 4 4 4 9 4 5 4 9 8 6 8 4 1
Math Format Input Examples • The...
User Guide - Page 18
...of an open parentheses), that value or fraction will be cut off as shown here. Original Expression:
Function Key Operation Resulting Expression
Fraction
'
log(a,b) Power Root
&...)2 × 2 =
5
MATH
Math
(1+'2c5e)
w*2=
• When you press = and obtain a calculation result using Math format, you can incorporate part of an input expression (a value, an expression within parentheses, ...
User Guide - Page 21
...calculation result
• Calculation results displayed in ' form are reduced to a common denominator, they are displayed in the above examples indicate what caused decimal form to be used. Reasons...10
110
• The result is the least common multiple of c and f.
• Since calculation results are outside of the allowable range - The following shows the range for each of the ...
User Guide - Page 36
...their arguments. Example: ∫(0.5X2 - 2, -2, 2) = -5.333333333 • A "Time Out" error occurs when an integration calculation ends without the ending condition being integrated, the presence of the tolerance range. k Power Functions and Power Root Functions
• Power functions and power root functions can be used in the integration interval, or the interval. • Pressing A will...
User Guide - Page 46
...Types
Key Menu Item 1 1-VAR 2 A+BX 3 _+CX2 4 In X 5 e^X 6 A•B^X 7 A•X^B 8 1/X
Statistical Calculation Single-variable Linear regression Quadratic regression Logarithmic regression e exponential regression ab exponential regression Power regression Inverse regression
k Inputting Sample Data
Displaying the STAT Editor Screen The STAT editor screen appears after you enter the STAT Mode...
User Guide - Page 48
...Editing Sample Data Replacing the Data in STAT editor screen (the number of sample
data values you can input) depends on the type of statistical data you selected, and on the calculator's setup screen.... You cannot edit parts of the existing data.
Important!
• Note that the insert operation will not work if the maximum number of lines...
User Guide - Page 54
...Type
Logarithmic Regression (ln X)
e Exponential Regression (e^X)
ab Exponential Regression (A•B^X)
Model Equation
y = A + Bln X y = AeBX y = ABX
Power Regression (A•X^B) y = AXB
Inverse Regression (1/X)
y
=
A
+
B X
Calculation Formula
Appendix Comparison of Regression Curves • The following example uses the data input in logarithmic, e exponential, ab exponential...
User Guide - Page 67
... (1998). • The values are performed from one unit to recall. Appendix and Perform all of these examples in any calculation mode except for each individual command. 1.
Functions preceded by values, powers, power roots: x2, x3, x-1, x r, g, ^(, x'( Normalized variate: ' t Percent: %
E-65 You can use the metric conversion commands in the COMP Mode (N1). This...
User Guide - Page 73
... every three years. Reference
k Power Requirements and Battery Replacement
Your calculator uses a TWO WAY POWER system that checks whether calculation functions are not what you will
cause the calculator to perform. (3) If the above steps do not correct your problem, press the O key.
Important!
• Removing the button battery from the calculator causes independent memory contents...
User Guide - Page 74
... replacing the battery, slide the hard case onto the front of operation per day.)
Operating Temperature: 0°C to turn the calculator back on one hour of the calculator. Screw
2 On the back of the calculator, remove the screw and the battery cover.
3 Remove the old battery.
4 Wipe a new battery with a dry cloth,
and then load it into the front of the calculator
Button Battery...
User Guide - Page 75
CASIO COMPUTER CO., LTD.
6-2, Hon-machi 1-chome Shibuya-ku, Tokyo 151-8543, Japan
SA0411-B Printed in China
Appendix - Page 52
CASIO COMPUTER CO., LTD.
6-2, Hon-machi 1-chome Shibuya-ku, Tokyo 151-8543, Japan
SA0411-B
Printed in China Imprimé en Chine
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