Acer 3600 Series User Manual page 21

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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.
Component
Microphone-in jack (front)
Headphone-out port
Hard disk activity LED
LAN activity LED
Power LED
Power button
see note
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