Question about HP 12c Calculator

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Number 6 on Key Pad, not working

I've had an hp 12c plat for about 2 years. Yesterday I noticed I was having to press the number six several times to get the number to display and today it's even worse. I use this calculator every day, but it has been baby'd. Any suggestions??

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  • zuidlaren Mar 31, 2008

    HP 12C - when # 3 button is pressed nothing happens, can this be 

    repaired ?.. 

  • Curtabennett Apr 16, 2008

    The number 6 on my hp 12c doesn't work. Is it worth repairing?

  • kotosh May 13, 2008

    Yes I do, but with "Zero" and "+"symbol. I have been wondering if, there is some one who knows how to fix it.

    Best regards



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I had the identical problem. One of the fixya folks helped me disassemble the calculator, which I did (there are about 6 plastic rivets which must be reamed away before the circuit board can be lifted out). Be careful not to lose the grounding springs which go back through the two hollow plastic posts. Pull the white sticky covering back carefully, noting which contact represents the "6". Clean the contact area as described but also make sure the contact is in the dead center of the "cut outs" in the sticky film area. When reassembling, I put a small piece of ace bandage between the board and the back of the calculator (towards the bottom, do not block the metal plate where it contacts the "spongy metal" grounding box). This is needed for support since the rivets have been removed.Carefully reassemble everything including the springs. Mine worked perfectly afterward!
I do have a theory that the magnets used in the "anniversary" case have an adverse effect on the calculator. Just a hunch, since one sits over the "6" key. I don't use that case anymore. Sorry they don't make 'em like they used to!

Posted on Sep 18, 2009

  • khlusk Jun 17, 2011

    I had and issue where the 6 key would not work consistently and at times had to hit the key very hard to have it work. I am not as mechanically inclined as some of the others so I just used some wd 40 and put in on the key and let a couple drops get between the key. So far that solved the problem. I am hoping that the WD 40 will evaporate and the 12c will continue to operate for some years to come. It has been a few days and so far it is still working great.


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Thanks for the posts guys! incredibly my calculator started have a problem with the 0 key 2 days before the exam. i would have had to spend $100 if it weren't for your post!

Posted on Nov 19, 2011

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Not sure on that model, but if you are handy, remove covers carefully and the keypads are usually made of two layers a small magnetic dot embetted in rubber and a circuit board. cleaning the magnetic dot with windex or even rubbing alchol, and using a pencil eraser lightly clean the small circuit booard. Smae machines actually have a switch which if you can find the switch it can be replace...good luck

Posted on Jun 28, 2008

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