The Museum of HP Calculators

HP Forum Archive 17

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HP 41 doesnt work
Message #1 Posted by Juergen Richter on 26 Apr 2007, 4:28 p.m.

I have a Problem with my 41 cv. I Changed the Batteries and a short time latter nothing goes. I took new batteries and nothing goes. Is there an special shortcut to reset the Computer.

Otherwise I need an diskription how i can open the calculator to search for malcontacts.

The Batteriecantacts are looking good.

Thanks for your help

Juergen

      
Re: HP 41 doesnt work
Message #2 Posted by Ron on 26 Apr 2007, 5:02 p.m.,
in response to message #1 by Juergen Richter

So far, every malfunctioning 41 I've seen has been either corroded contacts, or broken posts. Since your contacts are clean, I suspect it's a cracked/broken post. There is a screw under each foot, going into a post. If a post is cracked, there is poor contact between the electronics in the two halves of the calc. Depending upon how bad the posts are, they may be repairable. Check them out, and post your findings. I think many people here have experience repairing these.

            
Re: HP 41 doesnt work
Message #3 Posted by Juergen Richter on 27 Apr 2007, 3:40 p.m.,
in response to message #2 by Ron

Thanks to all that have answered.

Bevor opening the calculatot I tried the other tests.

Then i opend the calculator.

Indeed there was a little corrosin an the contacts between the both halfs. when i desambled the calculator (The posts are fortunatly ok) i found it and removed it.

So again Thank you Jürgen

      
Re: HP 41 doesnt work
Message #4 Posted by Frank B. (Germany) on 27 Apr 2007, 4:12 a.m.,
in response to message #1 by Juergen Richter

Before opening it you might want to go the the articles section and read article 149 ("Reseting an HP41").

Frank.

      
Re: HP 41 doesnt work
Message #5 Posted by Chiu Yiu Wai on 27 Apr 2007, 11:48 a.m.,
in response to message #1 by Juergen Richter

On my experience,one situation also out of consideration,and it can make hp41 can not turn on,"the spring of battery holder", the "spring" was dead form "elastic deformation" it has not enough force to push up the battery to contact the battery terminal.Maybe you can try add some metal foil between spring and battery,may be solve your problem.


Wish it can help you.

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