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Chapter 4: Motherboard Connections
Overheat (OH)/Fan Fail
Connect an LED cable to pins 7 and 8 to use the Overheat (OH)/Fan Fail connections. The
LED on pin 8 provides warnings of overheat, fan failure, or power failure. Refer to the tables
below for pin definitions.
OH/Fan Fail Indicator Status
State Definition
Off
Normal
On
Overheat
Flashing Fan Fail/PWR Fail
OH/Fan Fail LED
Pin Definitions (JF1)
Pin# Definition
7
Blue UID LED
8
OH/Fan Fail and PWR Fail LED
LAN1/LAN2 Activity LED
The LAN LED connection for LAN port 1 is located on pins 11 and 12 of JF1, and the LED
connection for LAN port 2 is on pins 9 and 10. Attach the NIC LED cables here to display
network activity. Refer to the table below for pin definitions.
LAN1/LAN2 LED
Pin Definitions (JF1)
Pin# Definition
9
+3.3 Stby
10
LAN2 Activity LED
11
+3.3 Stby
12
LAN1 Activity LED
Power Fail LED
Connect an LED cable to Power Fail connections on pins 5 and 6 of JF1 to provide warnings
for a power failure. Refer to the table below for pin definitions.
OH/Fan Fail Indicator
Status
Pin # Definition
5
3.3V
6
PWR Fail LED