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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  • 1 more comment 
  • 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?

    Curt@curtbennett.com

  • 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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HP 12 C display does not show entire numbers. How do I fix?


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25096057-rvrejqbjq4zuw4cbinsyjvsy-5-0.png "Although nine decimal places were
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Aug 30, 2013 | HP 12c Calculator

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Cpt button


There isn't one. Unlike calculators from other makers, the 12C knows whether you've just input a number or not. Simply press the desired item without entering a number to calculate it.

For example, if the book says to press CPT then PMT to compute the payment, simply press the PMT key on the 12C.

Aug 30, 2013 | HP 12c Calculator

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Cpt button 12c calculator


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Feb 22, 2012 | HP 12c Calculator

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HP12c seems to not have enough room for numbers BEFORE the decimal point. I try to enter the number "85" and all that will show up is the 8.000000000


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You need to hold the "F" key.---------

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------------ Click this link below and follow the procedure:--- http://howtobyme.blogspot.com/2011/07/hp-12c-calculator-help.html
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I have an HP 12C calculator and I cannot find the user manual and I cannot remember how to change the no. of decimal places?


Check this HP FAQ:
Setting a Fixed Decimal Place You can download the manual and user guides for your calculator from here:
http://h10025.www1.hp.com/ewfrf/wc/manualCategory?lc=en&dlc=en&cc=us&product=81575&lang=en&

For more information, Faqs & how-Tosgo the HP support homepage for your calculator:
http://h10025.www1.hp.com/ewfrf/wc/product?lc=en&dlc=en&cc=us&lang=en&product=81575&
s.gif
Introduction This document describes how to set the desired number of decimal places on the HP 12c calculator in standard format. It also covers how to enter a number in scientific notation. Instructions for standard format
  1. Press and release c01774993.jpg .
  2. Press the number key for the desired number of decimal places to be displayed to the right of the decimal point (0 through 9). The calculator displays a maximum of 10 digits.
The display will show the specified number of decimal places. The answer will be rounded to the number of digits selected. Example (standard format) If the number in the display is 14.87456320, the display will be changed as follows: Keystroke Display c01774994.jpg 14.8746 c01774995.jpg 14.9 c01774996.jpg 15 c01774997.jpg 14.87456320 Instructions for scientific notation Use scientific notation for very large or very small numbers. Type in the mantissa. After pressing, c01774998.jpg the next numbers keyed in are exponents of 10. Press c01774569.jpg . If during an operation a result has more than 10 digits, the calculator automatically displays the number in scientific notation
s.gif
Introduction This document describes how to set the desired number of decimal places on the HP 12c calculator in standard format. It also covers how to enter a number in scientific notation. Instructions for standard format
  1. Press and release c01774993.jpg .
  2. Press the number key for the desired number of decimal places to be displayed to the right of the decimal point (0 through 9). The calculator displays a maximum of 10 digits.
The display will show the specified number of decimal places. The answer will be rounded to the number of digits selected. Example (standard format) If the number in the display is 14.87456320, the display will be changed as follows: Keystroke Display c01774994.jpg 14.8746 c01774995.jpg 14.9 c01774996.jpg 15 c01774997.jpg 14.87456320 Instructions for scientific notation Use scientific notation for very large or very small numbers. Type in the mantissa. After pressing, c01774998.jpg the next numbers keyed in are exponents of 10. Press c01774569.jpg . If during an operation a result has more than 10 digits, the calculator automatically displays the number in scientific notation

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I want to increase the number of decimal places


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I found this solution on the HP website. Turn it on, and do what it says. Then turn it off and back on again, and the extra decimal places should show.

http://h10025.www1.hp.com/ewfrf/wc/document?dlc=en&lc=en&cc=us&docname=bpia5183 Introduction This document describes how to set the desired number of decimal places on the HP 12C Calculator in standard format and in scientific notation. Instructions for standard format
  1. Press and release the gold PREFIX key (f).
  2. Press the number key for the desired number of decimal places (0 through 9).
The display will show the specified number of decimal places. The answer will be rounded to the number of digits selected.

Mar 25, 2009 | HP 12c Calculator

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