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!
HP-41C high freq. beep
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11-21-2004, 01:17 AM
11-21-2004, 01:54 AM
Are these fullnut (1979-1984) or halfnut (1985-1990) units? 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
11-21-2004, 12:00 PM
Hi,
this usually occurs when the tone register hasn't benn resetted properly, Perform a BEEP (press SHIFT 4) and the HF tone will go away. Raymond
11-21-2004, 01:54 PM
Hi:
A full reset should solve that problem. Good luck
11-23-2004, 11:19 AM
I could not perform a machine reset and the squeeling persists.
11-23-2004, 12:21 PM
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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