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CHAPTER 2 HARDWARE INSTALLATION
2.1-4 CPU Fan Power Connectors: JFAN/CFAN1/SFAN1/
PSFAN1
These connectors support system cooling fan with +12V. It supports three
pin head connector. When connecting the wire to the connector, always
take note that the red wire is the positive and should be connected to the
+12V, the black wire is Ground and should be connected to GND. If your
mainboard has LM78 chipset on-board, you must use a specially designed
fan with speed sensor to take advantage of LM78’s CPU fan control.
2-16
SENSOR
+12V
GND
SFAN1
CFAN1
PSFAN1
Note: 1. CFAN1/SFAN1/PSFAN1 are the CPU, Power and Chassis
Cooling Fan Speed Connector (reserved for LM78 System Hardware
Monitor Option.)
2. Always consult vendor for proper CPU cooling fan.
For fans with fan speed sensor, every rotation of the fan will send out 2
pulses. LM78 will count and report the fan rotation speed.
SENSOR
+12V
GND
SENSOR
+12V
GND
PSFAN1 : Power Supply Fan
CFAN1 : CPU Fan
SFAN1 : System(Chassis) Fan
JFAN
+12V
GND
GND