Question about HP 12c Calculator
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??
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
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
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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Posted on Jan 02, 2017
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One adjustment is important before we get started. By default the 12C displays only two decimal places. This is not enough. Personally, I like to see five decimal places, but you may prefer some other number. To change the display, press "F" and then the number of decimal places you wish to display. I would press "F 5 " to display 5 decimal places. That's it, the calculator is ready to go.
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