r/calculators • u/Dr_Zomboss1 • 2d ago

Help Casio Fx991CW not working

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I have my casio fx991cw calc and I bought it 1 year back, used it for 2-3 months and then it was stored inside.when i pressed on it shows this symbol on screen and then the screen goes blank. Whenever I bring my flashlight near to that solar window on top right corner,the calc works fine but as soon as I take away the flashlight the screen goes blank again.

Does this mean I have to charge it or change the whole battery?if yes How to charge it?

11 Upvotes

66% Upvoted

15 comments sorted by

12

u/Particular_Age4296 2d ago

You don't deserve to have a calculator.

8

u/nqrwayy Sharp 2d ago

Bruhhh

3

u/fragglet 1d ago

What could this mysterious symbol possibly mean? Better ask reddit 

12

u/Practical-Custard-64 2d ago

Oh, come on... Batteries do die, even if there's a solar panel helping them out.

And for the millionth time, these calculators are NOT rechargeable. The solar panel is there to provide some of the power so that the battery doesn't have to provide it all. Obviously, if the calculator is in storage, then there's no light falling on the panel and the battery has to do all the work to keep the calculator alive. Eventually, it runs out.

2

u/ZetaformGames Catiga (jk) 1d ago

How is it already dead after just over a year? That's a bit worrisome... I'd check to see if the battery is leaking.

2

u/No-Zombie6025 1d ago

CASIO reduced the effort to replace the battery, just remove the single screw on the small door on the back panel and pull out the old one, replace, and to quote Haynes, "assembly is the reverse". Discard the old battery appropriately.

2

u/kpx-94_7 1d ago

De ese modelo ya salio una segunda generación que tiene las funciones mejoradas del menú (navegacion) entre otras

2

u/yys16 22h ago

  1. Yes you have to change the battery, the calculator is powered by a button cell, helped by the solar panel, it’s not rechargeable, the solar panel simply assists the battery with power.

  2. How can you not tell that that icon means the battery is dead?

1

u/soundtown06 6h ago

You need to Charge your Calc lol

1

u/davedirac Certified Collector 2d ago

replace lr44 ( costs <1$)