Headphone jack color code

Last week I fixed my headphone jack.

It wasn't easy to find which color from the cable needs to be connected to which part of the headphone jack.

Until I discovered a post about "Headphone wire color coding" on StackExchange.

What I learned from the post:

Red is for Right. Blue (or green) is for Left. Copper is for ground (I remember this with the mnemonic Red Right bLue Left Copper Common). All 3 are coated in a lacquer you need to burn or scrape off before you solder. With standard headphone plugs, with the plug facing away from you, the right pin is right, the center pin is ground, and the left pin is left.

1. Common (or "ground")
2. Right
3. Left
4. Insulating ring