HP Kayak XU 03xx Technical Information page 15

Front Panel Microphone
Connector
The Front Panel Microphone Connector, labeled "Front Panel Micro," is
a 3-pin connector. The Audio signal from this connector is directly
mixed with the signal from the rear panel Microphone jack. The
connector has the following pin assignments:
Pin
1 MIC signal + power (tip)
2 Analog Ground
3 MIC signal + power (ring)
HP Kayak XU 03xx PC Workstation Technical Information
Signal
IN
System Connectors and Switches
I/O
English
15