How do you connect an aux lead to a Sony mini hi-if component system

[Jenson_3]

I'm trying to connect an aux lead to a Sony mini hi-fi component system Mhc-ec69i

 

[Alabalcho]

Looking at the manual, there is no way to do that, unless you hack it (eg by eliminating the CD-player).
There are models which have "PC-In", but yours is explicitly excluded.