Biostar TG31-A7 Setup Manual - Page 9
JCFAN1: CPU Fan Header, JNFAN1: NorthBridge Fan Header, JSFAN1: System Fan Header
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TG31-A7 2.2 FAN HEADERS These fan headers support cooling-fans built in the computer. The fan cable and connector may be different according to the fan manufacturer. Connect the fan cable to the connector while matching the black wire to pin#1. JCFAN1: CPU Fan Header 1 4 Pin Assignment 1 Ground 2 +12V 3 FAN RPM rate sense 4 Smart Fan Control JNFAN1: NorthBridge Fan Header JSFAN1: System Fan Header JNFAN1 13 Pin Assignment 1 Ground 2 +12V 3 FAN RPM rate sense JSFAN1 Note: The JNFAN1/JSFAN1 supports 3-pin head connector and the JCFAN1 supports 4-pin head connector. When connecting with wires onto connectors, please note that the red wire is the positive and should be connected to pin#2, and the black wire is Ground and should be connected to GND. 7