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 Inasaaone on September 1st, 2016
How To Upgrade My Fx-991es Plus?
How to upgrade my fx-991es plus to fx-991ex?Please reply fast.
Current Answers
Answer #1: Posted by ruksha on September 1st, 2016 2:18 AM
ruksha
Member since:
August 30th, 2016 Points: 36,590
Member since:
August 30th, 2016 Points: 36,590
The circuits of Casio fx-*es series are almost the same, except the mode selection part. So you can upgrade your calculator by modifying the circuit.
I am Chinese and I edited these photos for a local forum. So please ignore Chinese characters on the photos.
This method is available for casio fx-*es calculators. NOT MS or ES PLUS series.
The version is marked on the back of the calc. you can see a letter in a small circle which is at the top-right corner of the rectangle that has text in it.
If the letter is A, you are lucky.
Just open the calc, find the P4 jumper on board, fill the gap with pencil.
Then turn on your calc, see if there are 8 modes available.
If the letter is B, see the following, it is difficult to upgrade, but it is possible.
CAUTION: The success rate seems be VERY low. About only 20% can do it without experience. It is easier to do it with a magnifier.
It will mostly affect the display(too dim, strengthen ) if you fail.
or just not able to turn
extend the line that is 75 on it, scratch a mark with a knife.
then place a ruler like the photo, there is about 1.2 cm from the reference to the chip.
mark a cross on the chip.
connect the reference to the destination then mark it on the bonding
dig it with a knife like the photo.
keep the trace narrow.
you NEED a magnifier, or it is very easy to be broken.
The mode will switches to P- if you cut the line between the chip and the board. You can fix it with a pencil if you want to give up. but it isn't matter if you want to upgrade.
P- only have 3 modes, but it can do calculus, SOLVE/CALC, sigma, but no natural display.
when you reach the border of the chip, you must be VERY careful.
clear the bonding on the chip until you can see the reflection of the chip.
ONLY need a little.
draw on the chip border with a pencil.
turn on your calc, press shift+7+on, press shift until the screen shows ROM 018 MODE P*
if it is P- or there is only 6 modes or 4 modes, try broaden the exposing length of the chip especially on right, then smear it again.
If it is P0 or P4 or P? with 8 modes available, you are done.
the keys are remapped as the 991, eg. the Abs key in 82 is CALC key in 991.
I try my level best to answer your question.if you got little bit information please rate my answer.
Thank you so much
Related Casio FX-991ES Manual Pages
User Guide - Page 4
...in this manual, it . Specify the angle unit in the illustration nearby. Initializing the Calculator
Perform the following shows an example of how a key operation to anyone for
special, ... event shall CASIO Computer Co., Ltd. E-2 • The following procedure when you see "Using Calculator Memory". Note that is indicated as f, c, d, and e. be liable for illustrative purposes only...
User Guide - Page 5
... accidentally swallowed.
• Keep batteries out of the reach of small children.
Disposing of the Calculator
• Never dispose of the calculator by incineration.
• Improperly using this manual.
Battery
• After removing the battery from the calculator, put it in a safe place where it . If accidentally swallowed, consult with a physician immediately.
•...
User Guide - Page 6
... dust. Wring out all important data.
• Avoid use and storage of the calculator in areas subjected to large amounts of this unit discharges slightly during shipment and storage...tight-fitting clothing where it to strong impact.
• Never twist or bend the calculator. A dead battery can cause memory contents to become corrupted or lost completely. Handling Precautions
&#...
User Guide - Page 7
... adjustment screen.
E-5 Important!
• If adjusting display contrast does not improve display readability, it , and then affix the hard case to the back of the calculator as shown in the illustration below.
After the setting is the way you want, press A.
• You can also adjust contrast using the...
User Guide - Page 8
... for input of a variable name to the variable. This indicator appears after you press a key. This indicator appears after you press a key. The calculator is in effect.
The calculator is in effect. The default angle unit is in the VECTOR Mode. The keypad will unshift and this :
The keypad has been shifted...
User Guide - Page 9
...
(2) Press the number key that takes a long time to execute, the display may show only the above indicators (without any value) while it performs the calculation internally. Calculation Modes and Calculator Setup
k Calculation Modes
When you want to select. • To select the CMPLX Mode, for example, press 2.
k Configuring the...
User Guide - Page 10
... key operation: 1N6(Fix)0-9 1N7(Sci)0-9 1N8(Norm)1(Norm1) or 2(Norm2)
Calculation Result Display Examples • Fix: The value you specify (from 0 to ... of Display Digits
To specify this: Number of Decimal Places Number of
decimal places for displayed calculation results.
Calculation results are written on paper.
• Linear format causes fractions and other expressions to the...
User Guide - Page 11
...:
1Nc5(Disp)1(Dot) 1Nc5(Disp)2(Comma)
• The setting you configure here is applied for input values is always a dot ( ).
only. The decimal point for calculation results
.
Outside the specified range, results are displayed using exponential format.
User Guide - Page 12
..., and parentheses. Example: 2 (5 + 4) - 2 × (-3) =
LINE
2(5+4)2*y3=
Inputting a Function with Parenthesis
When you input any of the functions shown below .
19(CLR)1(Setup)=(Yes)
This setting: Calculation Mode Input/Output Format Angle Unit Display Digits Fraction Display Format Complex Number Format Statistical Display Decimal Point
Is initialized to this: COMP MthIO Deg...
User Guide - Page 13
... a variable name, constant, or random number:
20 × A, 2 × π, 2 × i, etc. Inputting the 15th character causes the expression to shift to 99 bytes of a calculation, immediately before the = key is displayed, you input uses up one byte. E-11
Displaying a Long Expression The display can show up to the left side...
User Guide - Page 14
...insert mode is selected. • The initial default for more information. • The calculator automatically changes to the overwrite mode when you can only use depends on the display ...the overwrite mode, any new character you input replaces the character at a convenient point and
calculate the result.
The procedure you should use the insert mode. Changing the Character or Function ...
User Guide - Page 15
... × 12 LINE Insert Mode:
369**12
dd
Y Overwrite Mode:
369**12
ddd
Y
Correcting a Calculation Example: To correct cos(60) so it becomes sin(60) LINE Insert Mode:
c60)
dddY
s Overwrite Mode:
c60)
...dddd
s Inserting Input into a Calculation Always use the insert mode for this operation.
E-13 Use d or e to move the cursor to the...
User Guide - Page 16
... appear in your textbook.
Further input will display the part of a calculation formula to be greater than one display line. If this happens, divide the calculation into multiple parts and calculate each part separately. You can cause the height of the calculation where the error occurred, with Math format, you nest too many functions...
User Guide - Page 17
...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($) 1i(%) ! 1!(#) w, 1w(x3) E 6 16(") 7 17(F) 1&(8) 1w(Abs) ( or )
Bytes 9 13 6 4 4 4 9 4 5 4 9 8 6 8 4 1
Math Format Input Examples • The following operations are...
User Guide - Page 18
... incorporated into the ' function
MATH
Math
Move the cursor to use them.
Example 3: To input (1 + 2 )2 × 2 =
5
MATH
Math
(1+'2c5e)
w*2=
• When you press = and obtain a calculation result using Math format, you can be used in the above procedure, and the required key operations to here. This incorporates the expression in the...
User Guide - Page 19
... displayed using decimal values (no irrational number form) regardless of whether you can also incorporate values into the following functions. 1l($), 1i(%), !, 6, 1!(#), 1w(Abs)
Displaying Calculation Results in a form that includes π within irrational number display) display conditions are the same as those for S-D conversion.
Note
• When "LineIO" is selected...
User Guide - Page 20
... decimal form for input values outside of the above ranges. CMPLX Mode polar coordinate display (r ∠ θ )
The following are the calculations for which ' form is also counted as a term). ' form calculation results use display formats like those shown
below.
± a'b , ± d ± a'b , ± a'b ± d'e cf
E-18 Angle Unit Setting Deg Rad...
User Guide - Page 21
... underlined areas in decimal form even when any intermediate result has three or more terms.
Example: (1 + '2 + '3 )(1 - '2 - '3 )(= -4 - 2'6 ) = -8.898979486
E-19 More than two terms in the calculation result
• Calculation results displayed in decimal form - The following shows the range for each of the allowable range - Example: '3 + '2 = 10'3 + 11'2
11 10
110
• The...
User Guide - Page 22
... digits (Sci3) • For more information, see "Specifying the Number of decimal places and significant digits for the calculation result. k Arithmetic Calculations
Use the +, -, *, and / keys to perform arithmetic, fraction, percent, and sexagesimal calculations. Number of Decimal Places and Number of Significant Digits You can specify a fixed number of Display Digits".
For more...
User Guide - Page 23
... 3
Linear Format
Numerator Denominator Integer Part
Denominator
Numerator
(7'3)
(2'1'3)
• Under initial default settings, fractions are displayed as improper fractions.
• Fraction calculation results are always reduced before being displayed.
Appendix -2 + -1 = -7
326 3 -1 + 1 -2 = 4 - 11 (Fraction Display Format: ab/c)
4 3 12
4 - 3 -1 = -1 (Fraction Display Format: ab/c) 22...
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