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Chapter 4: Motherboard Connections
Power Fail LED
The Power Fail LED connection is located on pins 5 and 6 of JF1. When this LED turns solid
red, it indicates a power failure. Refer to the table below for pin definitions.
Power Fail LED
Pin Definitions (JF1)
Pin# Definition
5
3.3V
6
PWR Fail for LED6 (Solid red on: PWR failure)
Information LED-Blue+ (OH/Fan Fail/PWR Fail LED for LED5/blue UID LED)
Pin Definitions (Pin 7 & Pin 8 of JF1)
Status
Description
Solid red (on)
An overheat condition has occurred.
Blinking red (1Hz)
Fan failure: check for an inoperative fan.
Blinking red (0.25Hz)
Power failure: check for a non-operational power supply
Blinking red (10Hz) (FP red LED)
CPLD recovery mode error(s)
Solid blue
Local UID is activated. Use this function to locate a unit in a rack mount
environment that might be in need of service.
Blinking blue (1Hz)
Remote UID is on. Use this function to identify a unit from a remote location that
might be in need of service.
BIOS/BMC blinking blue (10Hz)
BIOS/BMC: recovery and/or update in progress
Red Info LED blinking (10Hz) and MB
UID LED blue blinking (10Hz)
CPLD: recovery and/or update in progress
Information LED (OH/Fan Fail/PWR Fail/UID LED)
The Information LED (OH/Fan Fail/PWR Fail/UID LED) connection is located on pins 7 and
8 of JF1. The LED on pin 7 is active when the UID button (JUIDB1) on the rear I/O panel is
pressed. The LED on pin 8 provides warnings of overheat, power failure, or fan failure. Refer
to the table below for more information.
