The Museum of HP Calculators

HP Forum Archive 19

[ Return to Index | Top of Index ]

HP71, ins't something missing ?
Message #1 Posted by Alberto Fenini on 14 Oct 2010, 1:25 p.m.

Dear all,
I have received this HP71 which I knew was for spare only
so I'm not complaining because it doesn't work.

However, I have just opened it, and based on the service manual
I was expecting to find a flex cable joining the two halves.



A closer look :



The flex is obviously missing, and looks like it was soldered
What do you suggest ?
Does anyone has an actual photo of how it should look ?

Thanks everybody in advance !
Take care Alberto

      
Re: HP71, ins't something missing ?
Message #2 Posted by Gerson W. Barbosa on 14 Oct 2010, 3:06 p.m.,
in response to message #1 by Alberto Fenini

Ciao Alberto,

I think Etienne Victoria can answer this better than me:

http://etienne.victoria.free.fr/Titan_zebra/

Gerson.

            
Re: HP71, ins't something missing ?
Message #3 Posted by Martin Pinckney on 14 Oct 2010, 9:25 p.m.,
in response to message #2 by Gerson W. Barbosa

Why not take a section of ribbon cable such as PC's used for the IDE or floppy drives, cut a short section 17 conductors wide, separate the wires slightly at each end, then solder this similar to how Etienne did. I little neater, perhaps.

                  
Re: HP71, ins't something missing ?
Message #4 Posted by Etienne Victoria on 15 Oct 2010, 1:27 a.m.,
in response to message #3 by Martin Pinckney

Hello all,

I agree, it would be much neater.

However, for this particular Hp-71B, I wanted to be able to route the wires separately inside the case.

Also, a folded 17 conductors-wide section would have had an excessive overall thickness IMHO.

Etienne

                        
Re: HP71, ins't something missing ?
Message #5 Posted by Adrian Godwin on 16 Oct 2010, 8:10 a.m.,
in response to message #4 by Etienne Victoria

I have replaced the flex connector in an HP71 using a bunch of wire-wrap wire in a similar way to Etienne. If the wire is kept together with a few small ties (also wire-wrap wire) it can be very tidy.


[ Return to Index | Top of Index ]

Go back to the main exhibit hall