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HP Forum Archive 03

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noisy 41CV/CX
Message #1 Posted by thib on 16 July 2000, 6:11 a.m.

Hello,

I already noticed many times that my old CV makes noise when it runs! It's not a big noise that anybody will hear when you use it in public but when I use it alone in my office, I can hear it. I think my CX does it sometimes also! Do you know what it means? Thanks in advance,

Thib;

      
Re: noisy 41CV/CX
Message #2 Posted by Steve on 16 July 2000, 12:20 p.m.,
in response to message #1 by thib

Yes, I hear that some HP-41's sing to their ownsers just to tell them that they love them.

Seriously, I have heard that some 41's make a noise, and that it comes from the keypad. I don't have any that do it (or my hearing isn't good enough maybe?)

            
Re: noisy 41CV/CX
Message #3 Posted by Carlos Tolossa on 16 July 2000, 4:24 p.m.,
in response to message #2 by Steve

Yes, I have a few 41CVs & CXs. Two of them make noise but this noise does not come from the keypad as Steveís. Iíve just replaced two batteries contacts I/O on them, and while paying close attention to them, I noticed an ultra-high-pitch long duration (10-sec) sound. It comes from a capacitor that mounts on the cpu board. Actually, there are three or four of them. Sounds like these caps charge and discharge constantly; this whistle does not affect operation though, timing and memory functions on the 41CX are always accurate therefore, I canít called them faulty capacitors. The most common sound I have heard on these machines is the sound of split screw-posts debris inside the case, then the last sound after this is when it hit the trash can..POONNNHH

                  
Re: noisy 41CV/CX
Message #4 Posted by Steve on 16 July 2000, 8:03 p.m.,
in response to message #3 by Carlos Tolossa

The last sound comes as the DEBRIS hits the bin, not the CALCULATOR, I hope :-O

                        
Re: noisy 41CV/CX
Message #5 Posted by Carlos Tolossa on 16 July 2000, 10:56 p.m.,
in response to message #4 by Steve

Correct..! I'm been sarcastic Steve.. :-) I know people who has done that.. I've seen it at work. I buy,collect,and trade every piece of HP-calc debris .

                              
Re: noisy 41CV/CX
Message #6 Posted by Chris Catotti on 16 July 2000, 11:52 p.m.,
in response to message #5 by Carlos Tolossa

It's been a long time since I have heard it, but I use sveral HP-41's ... my first HP-41CV did it frequently, seemingly when I would do a lot of Synthetic Programming. It seened harmless, and I am sur it is harmless. If I recall, the oly way I cleared it was by my version of a hard reset -- I would remove the batteries for 24-36 hours. The usually reason I even contemplated leaving them out that long was that I would sometimes get a lockup where I could not reset the HP-41CV any other way.

      
Noisy 42 and 48
Message #7 Posted by Menno on 19 July 2000, 5:58 a.m.,
in response to message #1 by thib

My 42S makes also noise. You have to hold it at your ear, but it makes sounds when a programm is running. And for the 48: that one has a heartbeat ! It's very regular, once a sec. (you must have the clock in display)

Have Fun

Menno


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