Re: HP-41CX Issues! Message #2 Posted by Richard Garner on 28 Mar 2003, 10:18 p.m., in response to message #1 by Jeff
Your question does not give enough detail for me to understand exactly what is going on, but all 41 calculators will display NULL if a key is held down for more than a couple of seconds no matter what mode you have it in. If you are not holding the key down to long, it could be that the keys are getting weak or sticking.
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