Dismantle Sennheiser HD 205

SOURCE: My Sennheiser HD 205 suddenly

The two copper wires on your headphones are independent grounds for each channel. Twist them together and attach them to the ground cable ( black) of the new plug. The colored wires of the headphone correspond to the live wires of each channel, and the plug should have the same colors. Wiring together the grounds will not affect in any way the stereo separation, it is just that each ear needs its own ground. Cheaper headsets just transfer the ground from one ear to the other one through the metal headband.

SOURCE: Sennheiser Hd 205 headphones stopped working properly

the problem is the cable from one driver to the other suffers from fatigue due to the bending of the plastic frame as the headphone fits to your head, causing copper cables to disintegrate.

the solution is to take apart the headphones (mini and regular Phillips screwdriver ONLY required) and solder a new cable in. in my case i used a standard coaxial cable for replacement.

once you have split the end of the senheiser cable output from cup 1 into its two parts you need to attach it to the equivalent connections on cup 2 (which u also need to split, i suggest using a modeling knife)

the red wire is insulated with ceramic coating much the same way as an electromagnet winding, the other is standard copper. you must attach copper to copper red to red with YOUR OWN cable.

the most difficult part is removing the ceramic insulation coating on the red wire, which i removed with a blast from a cigarette lighter. simple.

problem is your cable probably will not fit in the slot designed for the previous cable so i drilled a small hole in the BACK of the cup (silver colored horse shoe shape) and ran the cable outside the plastic case. not pretty but it saved me £40 for 2 hours work, which is not bad.

i am a trained mechanical and electrical engineer so u can trust.