Question about HP 12c Calculator

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HP12C I spilled red wine on my calculator and now it won't work at all---can it be cleaned???

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  • Anonymous Mar 23, 2008

    just dropped it on the pavement and it does not work..

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Yes, take it apart, and wash the circuit board.
Hard part is taking it apart without breaking the little tabs that snap the case together. It may have a couple hidden screws somewhere like in the batt compartment or under a label or under the rubber feet. Then carefully pry the case joint apart to get the snaps to let loose. Then the circuit board easily comes out - be careful if all the keys are loose not to disturb them. Also be careful of the display that may be loosely mounted. Once you get the board out, you can wash it with soap and water - whatever, just rinse it when clean with something like alcohol so no residues are left. Also be careful to not rub off any off the black key contact spots where the keys touch it. Put it back together loosely and see if it works.
Hope Ya Fix It!

Posted on Feb 05, 2008

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How do I get rid of the "C" on the screen?

Posted on Feb 04, 2009


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1 Answer

How can I fix HP12c when keys do not respond?


HP lists on their site (and in user manual) a way to run a key test to see which keys are bad. I'd start there.Type "hp 12c key test" into your search window on your browser and the first thing that comes up should answer it. Took me about 4 seconds to find this.

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How to Repairi sticky keys on hp 12c


Try cleaning around the key with a soft brush.

Jul 19, 2014 | HP Calculators Hp12c Finance Calculator

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How do you calculate square root on HP12C?


Use the square root function. It's the g-shifted function of the 1/x key (second key from the left on the second row).

May 14, 2014 | HP 12c Calculator

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Why does my HP12C have a c in the bottom right corner of the display?


It indicates that the calculator is set for compound interest on the odd period instead of simple interest. To toggle this setting press STO EEX.

Jun 02, 2012 | HP Calculators Hp12c Finance Calculator

1 Answer

Sticking/Under responsive zero key on an HP12c!! Is it trash?


It could be some dirt or grit in the keyboard, which a blast or two of compressed air might clear out. It could be a worn dome on the inside of the keyboard.
If you want to have it repaired, there's FixThatCalc, though they're currently not taking new orders. There also have been several threads on opening and cleaning Voyager series keyboards at the Museum of HP Calculators. Here's one article on opening a Voyager.

Apr 19, 2012 | HP 12c Calculator

1 Answer

Hi, I have an HP12C and for some reason the


Turn the calculator off. Hold down the period (decimal) key and hit the "ON" button at the same time.

Mar 03, 2010 | HP 12c Calculator

1 Answer

The + key works intemittently AND give wrong answers


Here is the link to one of my earlier posts where I show how to test the proper operation of your HP12C calculator. I invite you to read it.

Jan 06, 2010 | HP 12c Calculator

1 Answer

How can i tell the difference b/w hp12c and hp12p. i bought a hp12p from ebay(it's a stupid decision, I know!) and when i solving for IRR, i felt its running quite slow. I think the guy sold me the hp12P...


I couldn't find any reference to a HP calculator model 12p.
There is a HP 12c financial calculator and a 12c Platinum financial calculator.
Check both models (for images, specifications, functions, user guides, etc.) :
HP 12c Financial Calculator
HP 12c Platinum Financial Calculator

Aug 06, 2009 | HP 12c Calculator

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