The Museum of HP Calculators

HP Forum Archive 04

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Question on HP41CV
Message #1 Posted by Iqbal on 11 Nov 2000, 3:33 p.m.

I recently purchased a HP41CV Blanknut from a guy who said it had been stored away for the last 15 years. The buttons have a nice feel to it, but I have a problem with the on/off switch. It is not as soft as the user/ alpha or program keys. Could I spray it with something? Or will it have to be opened? thanks, Iqbal

      
Re: Question on HP41CV
Message #2 Posted by John Robinson on 13 Nov 2000, 12:15 a.m.,
in response to message #1 by Iqbal

I have sprayed from behind the switch, through the tiny hole with a good quality circuit board cleaner with good success for this kind of problem.

            
Re: Question on HP41CV
Message #3 Posted by Iqbal on 13 Nov 2000, 6:11 a.m.,
in response to message #2 by John Robinson

Thanks John, So I would need to open the calculator or can I spray it from the outside? Thanks again, Iqbal

                  
Re: Question on HP41CV
Message #4 Posted by Gianmaria (Italy) on 13 Nov 2000, 12:25 p.m.,
in response to message #3 by Iqbal

I opened one of my HP-41 series and I gained access behind the keyboard. All the keys are absolutely sealed (see this photo: http://utenti.tripod.it/gianmaria/hp41.JPG) and very different from the "Clasic" series keys, so in my opinion to spray anything should have no effect.

                  
Re: Question on HP41CV
Message #5 Posted by db (martinez, california) on 13 Nov 2000, 7:23 p.m.,
in response to message #3 by Iqbal

from the inside with tv tuner cleaner. carbon tet works but it can bleach out the keyboard face.

                  
Re: Question on HP41CV
Message #6 Posted by John Robinson on 13 Nov 2000, 7:35 p.m.,
in response to message #3 by Iqbal

Iqbal,

You need to open the calc, lay it face down, locate the small hole behind the "switch" if interest, and give it a squirt through the tube you get with spray pacs. It may not be immediately better, in fact it may be worse initially, but some "exercise" will make it as good if not better than before, hopefully better !!. Cheers - John


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