Sony PCV-L400 - Manual (Page 64)

VAIO Computer Reference Manual 56
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