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Graflarger power cord replacement

 
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t.r.sanford



Joined: 10 Nov 2003
Posts: 812
Location: East Coast (Long Island)

PostPosted: Thu Jan 08, 2004 7:47 pm    Post subject: Reply with quote

Has anyone replaced a worn line cord on a "Graflarger" power supply? (The wear, unfortunately, is right around the strain relief where the cord exits the PS enclosure.)

It does not look to me as though this can be done without removing a whole lot of potting compound from around the transformer, then lifting the transformer out. I would be very glad to learn I'm wrong about that!

If I'm right, I would be interested in hearing whether anyone has found a solvent that softens the stuff (I am not talking about flooding the enclosure with gasoline or ether, but rather, cautiously introducing a small quantity of something along the join between the potting compound and the enclosure sidewalls.)

And, does anyone know what Graflex, or Aristo, recommended for use as a potting compound, after a repair has been made?

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Graflite



Joined: 08 Nov 2001
Posts: 103
Location: Southeast US

PostPosted: Fri Jan 09, 2004 1:25 am    Post subject: Reply with quote

It has been several years now since I replaced the power cord on my 4 x 5 Graflarger power supply, but if I remember correctly the line cord from the transformer to the wall (or mains) socket was easy to replace as it used twist on wire nuts on the wires coming from the transformer to secure the wires.

However if I recall the cord from the transformer to the cold light grid did appear to have a sealant compound at the connections, but thankfully this cord did not need replacing at the time.

I would be hesitant to recommend anything in the way of a solvent to melt this sealant, but I wonder now if maybe the sealant (or compound) is perhaps similar to the liquid rubber coating that people dip tool handles in to make a rubber grip (and comes in different colors)?

Hope this little bit helps and good luck with your Graflarger.
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t.r.sanford



Joined: 10 Nov 2003
Posts: 812
Location: East Coast (Long Island)

PostPosted: Fri Jan 09, 2004 12:55 pm    Post subject: Reply with quote

Right, it's the cord to the coldlight head that's frayed. I had not looked at the thing for awhile, after postponing my excavation!

I did chip a certain amount of the stuff out, and it seems more like asphalt than anything else. I'm sure a modern potting compound will work, if I can remove the old material and make the repair.

Craig Camera does not list a service manual for the "Graflarger," and a tentative inquiry to Aristo went unanswered.

Thank you for your note; it's heartening to know that someone else has gotten one of these critters apart and put it back together again!
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45PSS



Joined: 28 Sep 2001
Posts: 3258
Location: Mid Peninsula, Ca.

PostPosted: Sat Jan 10, 2004 7:32 am    Post subject: Reply with quote

SEARCH (at the top of the page) >keyword=graflarger lamp> select=all the terms; gets This Old Thread.

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t.r.sanford



Joined: 10 Nov 2003
Posts: 812
Location: East Coast (Long Island)

PostPosted: Mon Jan 12, 2004 4:57 pm    Post subject: Reply with quote

The search procedure turned up an interesting and informative discussion of purchasing a replacement coldlight head from Aristo, and of using variable-contrast filters with this light source. Also, some valuable warnings about mounting the lamp. I find nothing about excavating ancient potting compound, alas...
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