Sony PCV-RX480DS - Manual (Page 87)

System Board 73
CD-IN Header
The CD-IN header on the system board is a 1 x 4-pin header that connects
to the DVD-ROM drive’s audio output connector (not used in the
PCV-RX490TV).
CD-IN header
Pin Signal Name
1 Left Line In
2 Ground
3 Ground
4 Right Line In
CD-IN
1
4