Question about HP 12c Calculator
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:
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.
Posted on Mar 22, 2011
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.
Posted on Mar 21, 2011
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Posted on Jan 02, 2017
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