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Chapter 4: Motherboard Connections
Overheat (OH)/Fan Fail
Connect an LED cable to pins 7 and 8 of the Front Control Panel to use the Overheat/Fan
Fail LED connections. The LED on pin 8 provides warnings of overheat or fan failure. Refer
to the tables 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
Blue LED
8
OH/Fan Fail LED
Power Fail LED
The Power Fail LED connection is located on pins 5 and 6 of JF1. Refer to the table below
for pin definitions.
Power Fail LED
Pin Definitions (JF1)
Pin#
Definition
5
3.3V
6
PWR Supply Fail
HDD LED/UID Switch
The HDD LED/UID Switch connection is located on pins 13 and 14 of JF1. Attach a cable to
pin 14 to show hard drive activity status. Attach a cable to pin 13 to use UID switch. Refer
to the table below for pin definitions.
HDD LED/UID
Pin Definitions (JF1)
Pin#
Definition
13
3.3V Stdby/UID_SW
14
HDD Active
NIC1/NIC2 Activity LED
The NIC (Network Interface Controller) 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
Pull up to +3.3 Stby
10
NIC2 Activity LED
11
Pull up to +3.3 Stby
12
NIC1 Activity LED
