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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 overheating 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
UID 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
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
3.3V Stby
10
NIC 2 Activity LED
11
3.3V Stby
12
NIC 1 Activity LED
HDD LED/UID Switch
The HDD LED/UID Switch connection is located on pins 13 and 14 of JF1. Attach a cable
to pin 13 to use the UID switch. 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
UID_SW
14
HDD Active
