Question about HP 12c Calculator

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I hit a wrong key and now my hp12c will not clear

I think I hit the EEX key and now my calculator will not clear. I put in 5280 then enter 5280 x and the answer was 5280.0000

How do I clear it?

Thank you

Jonalyn Young
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My mother worked for HP in the 60's - 80's and when I became a banker she gave me one of the first HP 12c's. One of the things we first noticed was how quickly we went through batteries, or so we thought that was the reason why the calculator was giving us wrong answers.

My mother came up with a solution which I still use today. If you have tried all known solutions, turn off the calculator and take the cover off the battery and remove the battery. Using a standard paperclip, stretch out the clip so that you can touch both sides of the metal casing where the battery normally sits (sometimes you have to tough the casing and then something metal outside the casing). The best way I can explain, is that it is like grounding out an older car alternater. Put the battery back; put the cover back on, turn on the calculator. If you get a
"Pr Error" message this is good news. Simply select the CLX key and life is wonderful again.
Don’t ask me why this works …. But what the heck …. It’s been working for me for years. Good Luck
Sherry-Lee and Winston the Super Rescued Dog by the Sea

Posted on Nov 17, 2008

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