Sony PCV-RX480DS - Manual (Page 85)

System Board 71
Headphones, Line In, Mic Jacks
The headphones jack is a stereo mini-jack (3.5 mm) that connects to
headphones. The line in jack is a stereo mini-jack (3.5 mm) that connects
to a stereo audio source (not an audio source from a video device). The
mic in jack is a stereo mini-jack (3.5 mm) that connects to a microphone.
Headphones
Line In
Mic
Headphones
Line In
Mic
Audio Right Out
Audio Left Out
Audio Right In
Ground
Audio Left In
Electret Bias Voltage
Ground
Mic Mono In