Wire problem on Carvin LB50

Hi guys, my name is Mike and I’m a french bassist. I have a used Carvin LB50 (1980?) for 13 years, never had a problem until now: sound cuts because a weld is out. As I’m a jerk in electronic I brought it to my luthier but he could’t find a solution.

Obviously electronic system has been already changed and it’s a mess. Disconnected wire came from stereo jack imput but we tried many combinations unsuccessful. Or the neck pickup worked but not the bridge pickup, or the bridge was ok but not the other ; and never the both together on middle position of course!

This bass is very rare in France (maybe I’m the only one) and nobody knows it, specially how does it work.

So I found a dealer in us and asked him a photo of stereo imput connections: he sent me a photo of cavity but jack imputs was not visible (need to unscrew female imput but he didn’t). I asked him again and he sent me the same picture, larger... Well done dude !

So I’m still looking for the right photo to fix it. If anyone as it, it would be great!


Thanks guys and sorry for my english.

 

Ok, this is mine, unfixed

 

and the picture sent, without imput(s)

 

It couldn’t be better, thanks a lot !!