The button pad could be bad, or you could have a bad portion of a chip, hard to tell. I've never taken a 12C apart, but it's probably possible to take apart and possibly clean the button pad, however, I believe these devices had a protective membrane on the button pads to prevent anything from getting to the pad contacts to contaminate them, so trying to clean it might be a waste of time and in vain.
You might review the procedure for performing NPV calculations on the following web page:
http://h20331.www2.hp.com/Hpsub/downloads/HP12CNPV.pdf
They mention something about the n register needing to be cleared, so it might be worth reviewing.
Sorry I don't have a specific solution, but hope this helps.
Hi,
Welcome to Fixya. If you're having problem problems about the result of NPV perhaps the userguide of HP 12c Calculator can help you. You can refer to page 74.
HP 12c Calculator Manual
If you have questions please let me know. Thanks for using Fixya.
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There are a lot of things you should check: the begin/end setting, the number of payments per year, the number of compounding periods per year, and more.
Could you post an example or two, with both the answer you expect and the answer you get?
I am not a novice hp 12c platinum user nor of average IQ. I have already checked all of the likely references in the owner's manual and searched the common online Q&A threads. I'm in need of expert commentary; that's why I turned to this website. Thanks / respectfully, Jonathan
Thanks for your help. After reviewing your link and a number of trial and error input combinations of my own, I was able to finally figure out this dilemma. For whatever reason, to get a hp 12c to properly to derive a NPV answer it needs an initial (T=0) cash flow amount input into the CFo register (using the [blue] [g] shift key). All of the references in the hp 12c manuals and other online threads reference inputting the initial CF amount as the first entry into the CFj register. However, this does not work. Thanks for your thoughts. They provoked thought that led me to the solution!!! Best, Jonathan
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