Seems to be a common problem on this otherwise great calculator that helped me through both high school and university. I've had mine for nearly 20 years and this problem showed up a few years ago. But I remember classmates reported the same problem when it was almost new.

If replacing batteries isn't helping, the problem is most likely caused by oxidation on the springs connecting the battery holder to the main PCB. The solution is as follows:

1. Remove the metal back cover (2 screws)

2. Remove the plastic back lid by removing the black screws (leave the batteries mounted) and CAREFULLY slide the back lid to the lower end (where the EXE button is located). Do not lift while sliding until the lid easily comes off.

3. On the back side of the plastic lid, very carefully bend the the two metal connectors ~1 mm on both batteryholders to increase their tension.

4. Clean the connecting pads on the PCB and the metal springs with de-oxidizer solvent.

5. Re-assemble and your 4500P calculator should be good as new.

Casio Office... | Answered on Sep 12, 2019

Casio FX82ES... | Posted on Sep 08, 2019 | Be the first to answer

Can I solve 3x^3 -2x^2+5x=7

5x^3-4x^2+4x=6

4x^3-3x^2+6x=8

These equations by using Casio fx-82ES PLUS Calculator?????

5x^3-4x^2+4x=6

4x^3-3x^2+6x=8

These equations by using Casio fx-82ES PLUS Calculator?????

Casio Scientific... | Answered on Sep 06, 2019

Hello,

Here is a link to Casio New Zealand. Enter the model number for your calculator (with and wihout the hyphen, I don't remember which) and download a bilingual manual. The quality of the copy is to say the least ... Well, why not let you discover it for yourself.

Bye.

Here is a link to Casio New Zealand. Enter the model number for your calculator (with and wihout the hyphen, I don't remember which) and download a bilingual manual. The quality of the copy is to say the least ... Well, why not let you discover it for yourself.

Bye.

Casio Office... | Answered on Sep 03, 2019

Google (casio)(KL 400)(manual) without parens OR contact Casio directly with your request.

Casio Office... | Answered on Aug 25, 2019

see videos and text

https://www.google.com/search?q=calculate+percentage+with+Casio+fx-991EX

https://www.google.com/search?q=calculate+percentage+with+Casio+fx-991EX

Casio Office... | Answered on Aug 24, 2019

Casio Office... | Posted on Aug 14, 2019 | Be the first to answer

You cannot do matrices with this calculator. Use an FX991 ES, or FX115 ES.

Casio FX82ES... | Answered on Jul 09, 2019

the function buttons are labeled + and -

to add put in the number then press the + button then put in the next number and + and son for all the numbers you are adding up

to subtract put in a number then press the- button ,then put in the next number and press the - button and so on

to do a combination calculation put in a number then press the + button and so on until you come to a number that you want to subtract in which case you put in that number then press the - button and if the next number is to be added ,put the number in and press the + button

to add put in the number then press the + button then put in the next number and + and son for all the numbers you are adding up

to subtract put in a number then press the- button ,then put in the next number and press the - button and so on

to do a combination calculation put in a number then press the + button and so on until you come to a number that you want to subtract in which case you put in that number then press the - button and if the next number is to be added ,put the number in and press the + button

Casio Office... | Answered on Jul 06, 2019

Casio FC-200V... | Posted on Jul 03, 2019 | Be the first to answer

Casio Office... | Posted on Jun 25, 2019 | Be the first to answer

DEBBIE LOOK IN THE OPERATORS MANUEL OR CALL CASIO CUSTOMER SUPPORT

Casio Office... | Answered on Jun 24, 2019

Press SHIFT MODE 7 then specify the number of digits you want after the decimal point.

Casio Scientific... | Answered on Jun 23, 2019

Casio Office... | Posted on Jun 17, 2019 | Be the first to answer

Casio Office... | Posted on Jun 16, 2019 | Be the first to answer

Casio Office... | Posted on Jun 10, 2019 | Be the first to answer

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