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restoring a FridenEC132 calculator

This is one device out of many to be restored for an upcoming early digital computing exhibition

jana°jana°
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retro Computing early digital fridenec132

This project was created on 08/03/2017 and last updated 5 years ago.

Description

I am restoring my neighbors Friden132 and would like to learn how to a) discharge the capacitors, b)analyse electrical problems, c)resolder if necessary,.. etc. to try and at least power the machine up again. The CRT display was one of the first of its kind and displays up to 8 digits I found out.

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  • showing at vintage computer festival zurich

    jana° • 11/14/2017 at 11:50 • 0 comments

    me and the owner of the friden will be showing this and other devices at https://twitter.com/VCFe_CH

    http://www.vcfe.ch/doku.php?id=startseite

    Come to visit our stand if you are in the area!

    Jana° & Fritz

  • friden running!

    jana° • 08/20/2017 at 16:41 • 0 comments

    Ok so I had some help from Chris (also known as 'Tesla-Chris' !) who showed me to test for voltage leakage safely, brought along a gradual voltage meter and figured out where the power blockage/failure was. It turns out the only real problem ws in the mains power supply, and it is up and running on full 220V now,- with a slight leakage into the chassis (source still to be found..)

    Yay to Chris!! First device running, almost ready to be shown.

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Oscarv wrote 11/14/2017 at 12:23 • point

The Computermuseum of the Uni Stuttgart is just repairing theirs. You might want to contact them if you need any information: http://computermuseum.informatik.uni-stuttgart.de/

  Are you sure? yes | no

jana° wrote 11/14/2017 at 12:42 • point

Oh great! -We have several, so will still need to get the others running, so thanks, always good to know there are others out there to collaborate with!

  Are you sure? yes | no

jana° wrote 08/03/2017 at 21:17 • point

thanks ted, given the age of them, I am expecting them to have to be replaced(?), but until I have learned how to safely 'discharge', I cant really diagnose even their condition. - I found a very useful blog about how the Friden is put together.. in case you are interested..

http://www.oldcalculatormuseum.com/friden132.html

  Are you sure? yes | no

Ted Yapo wrote 08/03/2017 at 15:43 • point

I'm not an expert, but my understanding is that you may have to re-form the capacitors as well.  Electrolytics slowly degrade over time, and you have to re-generate the oxide layer that forms the dielectric after long periods of disuse.  I'm not sure of a definitive source of information on the topic; I see some conflicting advice on-line.

  Are you sure? yes | no

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