M81-X Series User’s Manual
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5.11. Buzzer “BZ1”
It is a 5 volts onboard buzzer. When system has any abnormally state that you will
hear warnings through buzzer.
5.12. CUP / Power / Chassis Fan Connector “J1,J2,J11”
These are 3-Pin connector that support cooling fan of 12 VDC/0.5A or less, when the
system goes into sleep state, fan should be shut down to eliminate audible noise and
reduce power consumption. You can monitor the fan speed by way of W83627HF
chip and the fan must come with a tachometer output.
The CPU and motherboard will overheat if there is no air flow across the CPU and
onboard heat sink. Damage may occur to the motherboard and the CPU fan if these
pins are incorrectly used.
Pin
Assignment
1
GND
2
+12V
3
Speed/RPM
1
3
