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CHAPTER 2
HARDWARE INSTALLATION
2.1-5 CPU Fan Power Connector: JFAN1 / JFAN2 &
JFAN3 (Reserved)
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 on board, you need to use a specially designed fan
with speed sensor to take advantage of LM78’s CPU fan control function.
Note: 1. JFAN2 & JFAN3 are the Power and Chassis Cooling Fan Speed
Connectors (reserved for LM78 System Hardware Monitor Option.)
2. Always consult vendor for proper CPU cooling fan.
2-11
JFAN2
SPEED
+12V
GND
JFAN1
+12V
SPEED
GND
JFAN3
SPEED
+12V
GND
JFAN1: CPU FAN
JFAN2: POWER FAN
JFAN3: CHASSIS 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.