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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:
Pin
Function
1
Speaker out
2
No connection
3
GND
4
+5 VDC
The CN4 is a connector for the CPU cooling fan. It provides both
+5V and +12V when power is on.
Pin
Function
1
+12V
2
GND
3
GND
4
+5V
You can connect a LED to connector CN5 to indicate when the
HDD is active. Marks on the circuit board indicate LED polarity.
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.
Chapter 3 Connecting Peripherals
27
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