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Chapter 4: Motherboard Connections
ID_UID Switch/HDD LED
The UID Switch/HDD LED connection is located on pins 13 and 14 of JFP1. The UID switch
is used for a chassis that supports a front UID switch. The front UID switch functions in the
same way as the rear UID switch; both are for input only and cannot be used for output.
When this LED is blinking green, it indicates HDD is active. Attach a cable to pins 13 and 14
to show ID_UID status and hard drive activity. Refer to the tables below for pin definitions.
ID_UID/HDD LED
Pin Definitions (JF1)
Pins
Definition
13
ID_UID/3.3V Stdby
14
HDD Activity
ID_UID/HDD LED
LED State
Color
State
Blinking Green
HDD Active
FP Power LED
The Front Panel Power LED connection is located on pins 15 and 16 of JFP1. Refer to the
table below for pin definitions.
FP Power LED
Pin Definitions (JFP1)
Pins
Definition
15
3.3V
16
FP PWR LED
NMI Button
The non-maskable interrupt (NMI) button header is located on pins 19 and 20 of JFP1. Refer
to the table below for pin definitions.
NMI Button
Pin Definitions (JFP1)
Pins
Definition
19
NMI
20
Ground
