Hello all, as mentioned in my other thread (linked at bottom, can't figure out hyperlink) my CDV-700 headset worked for a brief period, then stopped, so I needed to fix it.
I started by taking the headpiece apart, and while it was rusty and it bad shape, it did seem fine. (not to mention it had been working anyways)
Then, while I was probing for a signal with it connected, I did not get anything, though testing at the Geiger counter itself I did get a signal (well, voltage that would be the signal), I thought that maybe I had a bad connection, then this happened, turns out I did have a bad connection after all, just not with the probes
So, the next step was to fix this, something which I had no clue to do, but figured out.
There is a small screw on the side of the headphone connector, take that out, and you will be able to remove the spring that works as some minor strain relief.
The next step, though somewhat optional, is to remove the threaded collar to gain easier access on the piece, to do this you slide it back and spin it counter clockwise, there is some threading on the main body of the headphone connector that serves to keep it in place.
After that, there was the issue of actually fixing the headphone wire, I could not see how I could get a soldering iron down in the body of the connector to hook on to the end, thinking maybe it popped out, but then I took a closer look at the contact on the inside, and it looked a lot like solder, so I applied a hot iron and it readily melted. With a solder sucker, I cleaned it out, and the small bit of wire that was left fell out quite easily, leaving a nice clean hole. It seems to be a rivet through some Bakelite material.
Afterwards, you want to cut the old wires and worn copper, if there is any left, for me only one wire had some left and it was in bad shape. Strip some new lengths, and tin one side, I used the same side as was previously connected though I am unsure if it would matter. Leave the other end plain.
Next, feed the wire through the strain relief and collar, then, separate the wires, and first feed the tinned wire through the middle the get it through the rivet hole. Once you have it through, bend it to the side, put an angle in the copper wire, and feed that through the screw hole in the side of the connector body.
Then, solder the main wire, and trim it, cutting into the solder a bit to reduce the point as much as you can, then heat the solder again so that it flows, you want a bit of a bulge to make a nice contact for with the connector on the Geiger counter itself.
After this, slide the strain relief spring into place, making sure the copper wire on the side does not move. Place the screw in, and tighten it down, securing the spring and the wire. For the final step, slide the collar down, and screw it onto the threading until you feel it become loose, it is then properly in place.
Hook it up and test it out, you now should have a working headset. It if does not work check the connections in the earphone to make sure they have not shaken loose over the years, mine were still in good shape.
https://www.eevblog.com/forum/chat/today-was-a-good-day-(wait-that's-an-understatement)-cold-war-tech-image-heavy/