My Sennheiser PX 360 have a faulty connection in the right earpad, so the right side doesn't work. How can i disassemble it?

SOURCE: Replacement connector for Sennheiser PX 250 doesn't work...

The bare copper conductor wire is the screening/common earth to the two signal wires of green and red. The important connection is the copper wire which goes to the jack plug earth which is the section furthest from the tip. The other two are the left and right signal connections. If you get these the wrong way round you will just have to swap them over. Check if they are the right way round by using the balance control on your amplifier or whatever. Have you checked that the problem is not with the headphone amplifier within your equipment? Don't rely on OK sound from loudspeakers as the headphones may be fed from separate op-amp output chip. Try another pair of cheap and cheerful headphones to make sure.

SOURCE: i've noticed that replacement inner

The ear padding is attached to and held in place by a plastic ring that fits into the speaker mount. Gently pull the ear padding outward so you can see the ring, then slip a flathead screwdriver or other object in (just a bit, you don't want to poke the speaker inside). Gently pry up , sliding your pry-bar along, and the pad should pop out quite easily.