Sony PCV-L620 - Manual (Page 65)

System Board 57
LINE IN and LINE OUT Connectors
The LINE IN and LINE OUT jacks are stereo mini-jacks (3.5 mm) that
connect to a stereo audio device (not an audio source from a video
device). Connect a stereo audio output jack to the LINE IN jack, and the
LINE OUT jack to a stereo audio input jack.
LINE IN jack
Pin
Signal
Sleeve GND
Tip Audio-Left In
Ring Audio-Right In
LINE OUT jack
Pin
Signal
Sleeve GND
Tip Audio-Left Out
Ring Audio-Right Out
KY0058.VSD
LINE IN
LINE OUT