Compact Flash Connector Master∕Slave Select Header（Jp3; Cpu Clock Select Header（Jclk1; Internal Buzzer（Bz1; Cpu Fan Power Connector（Fan1, Fan2, Fan3 - Acrosser Technology AR-B1891 User Manual

3.14 COMPACT FLASH CONNECTOR MASTER⁄SLAVE SELECT HEADER（JP3）
Set the jumper on one compact flash device as Master and the other as Slave.
3.15 CPU CLOCK SELECT HEADER（JCLK1）
3.16 INTERNAL BUZZER（BZ1）
3.17 CPU FAN POWER CONNECTOR（FAN1, FAN2, FAN3）
FAN1, FAN2, FAN3 is a three pin header for system fans. These fans power supplies +12V power voltage.
FAN1, FAN2, FAN3
1
JP3
1
JCLK1
BZ1
1
PIN
1-2 ON MASTER MODE
SLAVE MODE
1-2 OFF
（Factory Preset）
PIN
1-2 ON
2-3 ON
（Factory Preset）
PIN
1
2
PIN
1
2
3
SIGNAL
SIGNAL
133 MHZ
100 MHZ
SIGNAL
+5V
SPEAK
SIGNAL
GND
+12V
SENSE