HP ProBook 4520s Notebook PC and HP ProBook 4720s Notebook PC - Maintenance and Service Guide

8 Connector pin assignments
Audio-in (microphone)
Pin Signal
1 Audio signal in
2 Audio signal in
3Ground
Audio-out (headphone)
Pin Signal
1 Audio out, left channel
2 Audio out, right channel
3Ground
150 Chapter 8 Connector pin assignments