Question about Casio MS-80TV Scientific Calculator

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CHANGE THE CALCULATOR FROM 5% TO 17.5

IT WAS ON 17.5 BUT PUTTING NEW BATTERIES IN HAS MADE IT GO TO 5%.

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Noe i want to put 7 % how do i fix it

Posted on Sep 30, 2008

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Posted on Jan 02, 2017

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If this doesn't do it, please reply to this post and we can go on to the next step.

Jan 19, 2011 | Texas Instruments TI-83 Plus Calculator

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There can be two causes to this problem. One, the batteries that you put in may be expired. Some batteries have expiration dates on them (i.e. Duracell). If the year on it has expired or is coming near to expiring, you may have to put newer batteries in there that are longer lasting in years. Even if the expiration year is far-off, you still may need to put newer batteries in the bay. Two, your hypothesis of changing the lithium battery are correct. I read in the manual that you should change it every 3 or 4 years. The lithium battery is the back-up battery and it is like a memory card for you calculator. Whenever you put a new fresh set of batteries in the bay, the lithium battery saves your information while you are inserting the batteries in the bay. When you turn on the calculator again, it saves your functions that you've had in there. Hope this clears up your confusion! Reply back if you are still seeing the message.

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Hello I have putted new batteries in my ca&lculator ti-83, but it won't turn on? Do I have to change the lithium battery also?


TI calculators have an annoying habit of dimming the screen when the batteries are changed so that it appears as if the calculator isn't turning on. Turn the calculator on (or at least press the ON key). Press and release the 2ND key. Press and hold the Up-arrow key for a few seconds and see whether the screen becomes legible.

If this doesn't do it, please reply to this post and we'll go on from there.

Nov 09, 2010 | Texas Instruments TI-83 Plus Calculator

1 Answer

Calculator said battery low so put in 4 new batteries and does not turn on.


TI calculators have an annoying habit of dimming the screen when the batteries are changed so that it appears as if the calculator isn't turning on. Turn the calculator on (or at least press the ON key). Press and release the 2ND key. Press and hold the Up-arrow key for a few seconds and see whether the screen becomes legible.

If this doesn't do it, please reply to this post and we'll try to reset the calculator.

Nov 03, 2010 | Texas Instruments TI-83 Plus Calculator

1 Answer

I put new batteries in and it won't power up. Does the back-up battery effect this?


The backup battery is intended to retain the contents of memory while you change the main batteries. It's possible to run the calculator without one.

TI calculators have an annoying habit of dimming the screen when the batteries are changed so that it appears as if the calculator isn't turning on. Turn the calculator on (or at least press the ON key). Press and release the 2ND key. Press and hold the Up-arrow key for a few seconds and see whether the screen becomes legible.

If this doesn't do it, please append a comment to this post and we'll go on from there.

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TI calculators have an annoying habit of dimming the screen when the batteries are changed so that it appears as if the calculator isn't turning on. Turn the calculator on (or at least press the ON key). Press and release the 2ND key. Press and hold the Up-arrow key for a few seconds and see whether the screen becomes legible.

If this doesn't do it, please append a comment to this post and we'll go on from there.

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