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Chapter 3: Motherboard Connections
Overheat (OH)/Fan Fail
Connect an LED cable to the OH/Fan Fail connections on pins 7 and 8 of JF1 to provide
warnings for chassis overheat and fan failure. Refer to the table below for pin definitions.
OH/Fan Fail Indicator
Status
State
Definition
Off
Normal
On
Overheat
Flashing Fan Fail
OH/Fan Fail LED
Pin Definitions (JF1)
Pin#
Definition
7
+3.3V
8
OH/Fan Fail LED
HDD LED
The HDD LED connection is located on pins 13 and 14 of JF1. Attach a cable to pin 14 to
show hard drive activity status. Refer to the table below for pin definitions.
HDD LED
Pin Definitions (JF1)
Pins
Definition
13
+3.3V Stdby
14
HDD Active
NIC1/NIC2 (LAN1/LAN2)
The NIC (Network Interface Controller) LED connection for LAN port 1 is located on pins
11 and 12 of JF1, and 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
9/11
3.3V Standby
10/12
NIC Activity LED
