HP Forum Archive 14

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HP-41C high freq. beep Message #1 Posted by Erik Wahlin on 21 Nov 2004, 1:17 a.m. I ahve a couple of HP-41CV calculators tghat just emit a high frequency beep when they are turned on. Does anybody know what might be the problem? Thanks!

Re: HP-41C high freq. beep Message #2 Posted by Karl Schneider on 21 Nov 2004, 1:54 a.m., in response to message #1 by Erik Wahlin Are these fullnut (1979-1984) or halfnut (1985-1990) units? (Check out this website for details.) I bought a fullnut 41CX that displayed gibberish and emitted a high-pitched tone, punctuated by pulses at-one-second intervals. (The CX clock might have explained the pulses.) An ultrasonic cleaning and resoldering of bad contacts by www.fixthatcalc.com fixed the problems. NOTE: Fullnuts are more servicable and repairable than halfnuts. -- KS

Re: HP-41C high freq. beep Message #3 Posted by Raymond Del Tondo on 21 Nov 2004, 12:00 p.m., in response to message #1 by Erik Wahlin Hi, this usually occurs when the tone register hasn't benn resetted properly, which can be the case after a lockup or after inserting batteries Perform a BEEP (press SHIFT 4) and the HF tone will go away. Raymond

Re: HP-41C high freq. beep Message #4 Posted by Jon on 21 Nov 2004, 1:54 p.m., in response to message #1 by Erik Wahlin Hi: A full reset should solve that problem. Schitch off the calculator. Press "del" (keep it preseed)and then "on/off". Release "on/off" and finally release "del". If you read MEMORY LOST the reset is done. Good luck

Re: HP-41C high freq. beep Message #5 Posted by Erik Wahlin on 23 Nov 2004, 11:19 a.m., in response to message #1 by Erik Wahlin I could not perform a machine reset and the squeeling persists.

Re: HP-41C high freq. beep Message #6 Posted by Jon on 23 Nov 2004, 12:21 p.m., in response to message #5 by Erik Wahlin Hi: Remove the battery pack and short the end battery terminals together (just for a moment). Install batteries again. May be you have to press the ON key more than once to turn the calculator on. If it doesn´t work you need it to be internally cleaned. Regards Jon

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