Aaeon SBC-590, User Manual

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Chapter 3 Connecting Peripherals 27
External Speaker (CN3)
The CPU card has its own buzzer. You can also connect to the
external speaker on your computer chassis. Pin assignments for
CN3 are shown below:
External speaker (CN3)
Pin Function
1 Speaker out
2 No connection
3 GND
4 +5 VDC
CPU cooling fan power connector (CN4)
The CN4 is a connector for the CPU cooling fan. It provides both
+5V and +12V when power is on.
CPU cooling fan power connector (CN4)
Pin Function
1 +12V
2 GND
3 GND
4 +5V
Hard Drive LED (CN5)
You can connect a LED to connector CN5 to indicate when the
HDD is active. Marks on the circuit board indicate LED polarity.
Reset Switch (CN6)
You can connect an external switch to easily reset your computer.
This switch restarts your computer as if you had turned off the
power, then turned it back on.