Video demonstration on how the internals of a cd changer work. I do not explain the moving parts, but I have provided a couple different views so you are the see the movements of the internal components. If you find your cd changer has jammed, sometimes you can assist one of the moving parts to help them remove. This then enables you to remove the cd cartridge. Not all cd changers are the same, there are different models and manufactures available on the market. This particular unit is a 6 disk cd changer from a 1997 BMW 540i.