iFixit - Answers With Device "Casio Calculator"

Casio FX-991ES Plus: My calculator is not turning on

Mon, 27 Apr 2026 14:31:31 -0700

How can i fix it

⟐ Commented April 27, 2026 at 14:31 MST

Casio fx-580VNX: Calculator has a malfunctioning button

Fri, 17 Apr 2026 03:40:29 -0700

What's wrong with my Casio calculator? I was using it for normal calculations when I noticed about 5-6 buttons stopped working. Is there any way to fix this?

Casio fx-82ES: Why does my calculator not turn on when I press the on button

Thu, 19 Mar 2026 21:24:41 -0700

Why does my calculator not turn on when I press the on button

⟐ Commented March 19, 2026 at 21:24 MST

CASIO fx-82AU PLUS II NNATURAL-V.P.A.M.: Why is my 0 not working?

Fri, 20 Feb 2026 09:54:29 -0700

Why is my 0 not working?

Casio fx-82ES: Porque mi calculadora no prende

Sat, 03 Jan 2026 10:18:07 -0700

No enciende,se oprime on y no funciona

⟐ Commented January 03, 2026 at 10:18 MST

Casio FX-991EX: The arrow keys, alpha keys and the mode setup key are not working

Wed, 24 Dec 2025 04:00:37 -0700

arrow keys, alpha keys and the mode setup key are not working

Casio FX-991ES Plus: in dark place cannot see display

Wed, 09 Jul 2025 22:29:03 -0700

991es plus i bought 13years ago, now i use it to change the battery but lighting strong place there can use it. no lighting dark place cannot see the display but its working. how should i do?

Casio FX-991ES Plus: Facing Problem on my calculator

Mon, 02 Jun 2025 01:05:08 -0700

⟐ Edited June 02, 2025 at 1:05 MST

Casio fx-82ES: After changing battery it not correct display

Wed, 21 May 2025 06:25:35 -0700

I changed the battery but screen does, nt display correctly

⟐ Commented May 21, 2025 at 6:25 MST

Casio FX-991EX: Why is my calculator turned on and off consecutively for no reason?

Tue, 11 Mar 2025 07:04:00 -0700

can someone help? maybe it could be abattery issue but i need help :))

Casio FX-991ES Plus: Why screen are suddenly off and turn on?

Wed, 05 Mar 2025 13:07:28 -0700

in my calculator ,while i type or click digit like 3 to 4 numbers the screen refresh automically ....i mean when i click my fourth or seventh number the screen auto refresh and all type on screen are being deleted...on the other hand sometimes screen not shown to me...if i click a digit for a while the screen shown to me then i press of the digit screen are off....i changed my battery...now what should i do? is this repairable?

Casio FX-991ES Plus: How to fix the calculator that failed down and doesn't wanna open agai

Mon, 28 Oct 2024 17:19:52 -0700

How to fix a calculator that failed down and doesn't wanna open again

Casio FX-991ES Plus: Calculator not working properly

Wed, 25 Sep 2024 09:41:18 -0700

I have casio fx99ies plus calculator. 3 days earlier i was using it when it turned off then i replaced its lithium battery but it won't start then i noticed that when i press the battery hardly it starts but when i release it, it stops . Kindly tell a solution to this problem

Casio fx-82MS: How I do get rid of 7,8,9 problem to make it normal,

Tue, 30 Jul 2024 21:38:17 -0700

how i do get rid of 7,8,9, when i press7 inspite of 7 calculator show me 7, like wise 8, 9, so how i make it normal even i reset power off done still not get ride

⟐ Edited July 30, 2024 at 21:38 MST

Casio FX-991EX: keys keep getting stuck

Sat, 27 Jul 2024 12:53:40 -0700

i attempted to take apart the calculator so i could clean the keys similarly to how you would clean laptop keys, however i was unable to separate the circuit board from the main body- is there a way to do this? The number 5 key in particular keeps getting stuck whenever i try to use it and i have tried to clean this externally but to no avail

Casio fx-9750GII: I can't click right.

Mon, 19 Feb 2024 12:12:16 -0700

I've checked every button. They all work except the right button on the circle of arrow keys. I opened it up and couldn't find anything obviously wrong but I'm not an engineer by any means and would love some help. The keypad looks fine and not worn down. The carbon contact doesn't look worn down, maybe a little dusty. I rubbed it over with an unused toothbrush but it didn't help.

Any ideas?

Casio FX-991ES Plus: started working like that of Casio 115 ES plus.

Fri, 10 Nov 2023 18:25:59 -0700

I'm using Casio Fx-991EX class wiz. Suddenly the function started working like that of Casio 115 ES plus. It brought out Chinese instead of English and the keys aren't working well like it was doing before. (When I press Calc, box raise to the power of 3 is displayed

⟐ Edited November 10, 2023 at 18:25 MST

Casio fx-82MS: When calculating values having power the answer gone wrong

Thu, 05 Oct 2023 23:04:56 -0700

When calculating values having power ,the answer gone wrong

Casio fx-9750GII: Why my calculator is stuck in the main menu?

Thu, 18 May 2023 09:42:20 -0700

I just replaced the batteries for new ones, when I tried to turn it on: it appeared the main menu and now it’s stuck there. I’ve already tried resetting it, took out the batteries and put them back again, I’ve also tried to use the F2+4+Ac/on+RESET, and then press 9 and x, and still nothing happened.

It’s literally stuck on the main menu like the picture I’ve attached.

Please help.

⟐ Commented May 18, 2023 at 9:42 MST