Acer 5600 series - Manual (Page 75)

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Audio board
The audio board that came with your computer should look like the
figure that follows.
Note: The system has two microphone-in jacks (front and rear).
However, you can not use both of them at the same time. By
default, your system enables the microphone-in jack in front and
disables the one at the back.
Label Description
CN1 USB 1.1 connector
CN2 and
CN3 USB ports
CN4 Standard Audio connector - connects to the CN16 of the
mainboard
CN5 USB connector - connects to the CN18 connector of the
mainboard
JK1 Microphone-in jack (front) see note
JK2 Audio-out port
JP1 Audio connector