Question about HP 12c Calculator

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If changing battery doesn't power up HP 12c...what whould be the next option to check?

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  • kakima Oct 06, 2010

    Hold down the - key and then press and release the ON key. Does that do anything?

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The same thing happened to me today. Try performing a hard reset (small hole near battery). Worked for me.

Posted on Oct 11, 2010

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My hp 12c will only display 7.=L no matter what keys I press...I have tried all the reset exercises..what next?


Couple of possibilities:
Dodgy power is the first thing to address. Get a replacement battery - 3V lithium CR 2032 type. Swap it for the current one. Check, while the system is open, if the battery and/or battery contacts look dull, corroded, or tarnished. If they do, you can try cleaning the battery contacts with a pencil eraser, or some fine steel wool (non-soapy kind) or fine sandpaper to brighten it.

2) You can reset memory to see if that has an effect. With calculator off, hold [On], then press [-] at same time. Still holding [-]. release [On], then release [On] May blink or flash for a couple tens of seconds. This will erase everything in memory, programs and saved calculations.

3) The general self-test is doing the same process as in (2), but with the [+] or [x] key instead of the [-] key. Should take 20-30 seconds and all sorts of things will flash or light up on the display while this happens. If the system thinks it's fine, you'll end up with the normal start display. Otherwise, there may be error messages. At that point, you might have to contact HP.

4) You can view the use manual (all 170+ pages of it) at http://www.hp.com/ctg/Manual/c00363319.pdf . Lord knows if the addresses for service are still valid.

Good Luck !

Jun 02, 2015 | HP 12c Calculator

1 Answer

How to fix my hp calculator 12c numbers display is faint?


There is no contrast adjustment possible with the 12c. Most of the time, faint displays are due to weak batteries or poor contact with the battery or batteries.

Jun 26, 2014 | HP 12c Calculator

1 Answer

Cpt button 12c calculator


Unlike TI calculators, the HP 12c doesn't have or need a CPT button. It knows whether you've made a numeric entry or not. To calculate N, I, PV, FV, or PMT, simply press the appropriate key without entering a number.

Feb 22, 2012 | HP 12c Calculator

1 Answer

Do you have advice in calculator choice between HP 12 c and the TI BA II Plus Professional Financial Calculator? Assuming that I get proficient with RPN (which I'm learning now); is one faster than the...


The 12C is more expensive and more powerful than the BAII+Pro. The HP is also programmable, which the TI isn't. Starting from scratch (assuming you've never used a calculator before---a somewhat unreasonable assumption) the TI might be easier to learn, at least initially. But after a certain point, the HP will leave the TI behind. The HP is faster and more capable.

There are at least three different versions of the 12C available. There's the original 12C, the 12C Platinum, and the current 12C. The only way to tell the difference between the two non-Platinums is to look at the battery compartment---the original uses three button cells while the newer uses two coin cells. The newer one is MUCH faster. The Platinum, however, can use RPN or algebraic.

Unless your choice is limited to the 12C or the BAII (by the requirement of an exam, perhaps), you might want to look at the HP 20B and the HP 30B. Programmability aside, they're even more powerful and easier to use and faster than the 12C, and the 30B is also programmable.

There are other considerations, of course. Factors such as the feel of the keyboard, the 12C's landscape orientation as opposed to the others' portrait orientation, etc, are all matters of personal preference.

Disclaimer: I own multiple HP and multiple TI calculators. I tend to use HP calculators for calculating, while I use TI calculators to answer questions here at FixYa.

Mar 23, 2011 | HP 12c Calculator

1 Answer

I have an HP 12c. I replaced the battery (CR2032) and the unit will not turn on.


Try to flip the battery, if it does not work, pull the battery out and wait for 10 minutes. After that, put the battery in again.

Feb 28, 2011 | HP 12c Calculator

1 Answer

My HP 12C will not turn on even after changing the battery


Check to see that the batteries are in correctly and that the contacts are clean. If not, it may be time for a new one.

Mar 30, 2009 | HP 12c Calculator

1 Answer

Changed batteries, zeros are in display but no key response


Perhaps a the connections are dirty (battery connections) or you may have the wrong battery type/model

Feb 11, 2009 | HP 12c Calculator

1 Answer

How to reset my HP 12 C calculator ? it's doesn operate right


I just follow the paper clip trick (took the batteries out, connect the + and - with th epaper clip, then turn it off). After clearing all the program memory and turned it on & off, it worked fine.
Thanks.

Jan 06, 2009 | HP 12c Calculator

1 Answer

Calculator dead


Can you plug it directly into a adapter, and will it work?

Feb 26, 2008 | HP 12c Calculator

1 Answer

Display a decimal point


Turn the calculator off, then press and hold down the .(decimal key) while you press the on button. Doing so again sets the calculator to use the original digit separators in the display

May 10, 2007 | HP 12c Calculator

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