Hi, I took my headphones (DT 770) to have a new jack put on after the old one was damaged and i (stupidly) cut it off. They are unsure of the wiring configuration and the technical info regarding the fourth wire (positive or negative etc) Is there a diagram or spec sheet I can see? Thanks

Hey benblay7. Cutting the wire was not stupid at all.

Two of the wires are ground and are tied together and soldered to the ground terminal. These should be the same color, usually a shiny copper color. The ground is negative. The tip of the plug should be wired to the left side and the center is, of course, the right.

Check this out: explainthatstuff.com/howtorepairheadphones.html

Good luck from Detroit, MI.

If the connector of your headphone 3.5mm i-pod headphone type then it is very easy to repair bcoz i also repair this type about 4-5 times.i can give the circuit diagram to u by this i becomes easy to solder them & remember that the three wires are sapreted properly from each other ............
The countinuty of wires can be find by countinuty test........
If u get ur ans then help me to fin cicuit diagram of my handsfree of nokia n73 HS-28 a music edition remote control handsfreeat pop-port/connector side is i know that but not know at the the controller side plez help me to find circuit diagram....................

I have the same problem, and the answer of goggomobil isn't enough help. These are professional headphones that have four wires, (not simple left/right signal + ground, like ordinary minijack wiring). The cable is very robust and consists of two halves. In one half there are two ultrathin wires embedded with brown and white sleeves, in the other half the colors of the sleeves are green and red. The cabling is probably meant for balanced connection. I also don't know how to connect the four wires to a minijack plug, and how to solder the very thin copper wires inside.