HP-41C high freq. beep
#1

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!

#2

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

#3

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

#4

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

#5

I could not perform a machine reset and the squeeling persists.

#6

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



Possibly Related Threads…
Thread Author Replies Views Last Post
  HP8925A - Continuous BEEP and garbage display mark stephens 3 1,470 08-03-2013, 08:54 AM
Last Post: Rik Bos
  200LX problem: Insert batteries and get a continuous beep... ideas ? Gene Wright 8 2,657 06-19-2013, 04:52 PM
Last Post: gene wright
  New high def picture of new TI-84 Plus Color SE Mic 17 4,710 11-26-2012, 04:17 PM
Last Post: Luiz C. Vieira (Brazil)
  HIGH END HPs.. Status Symbols?? John W Kercheval 13 3,472 05-09-2012, 12:55 AM
Last Post: Matt Agajanian
  HP 20S with very high "off" current Neil Hamilton (Ottawa) 2 1,192 04-01-2012, 11:49 AM
Last Post: Neil Hamilton (Ottawa)
  HP-15C LE : Workaround for the high current spike Lyuka 14 3,810 01-12-2012, 04:43 AM
Last Post: Lyuka
  HP50g - High power consumption Frido Bohn 2 1,154 10-21-2011, 04:34 AM
Last Post: Frido Bohn
  wanted: high-resolution photo of 50g internals Eric Smith 9 2,915 10-04-2011, 02:08 AM
Last Post: Marcus von Cube, Germany
  And they say that a sale value of a hp 41cx is high. robertoataulfo 7 2,028 08-17-2011, 07:46 AM
Last Post: M. Joury
  Emu48 problem with BEEP patches fhub 4 1,449 07-03-2011, 04:53 PM
Last Post: fhub

Forum Jump: