Pilot Motherboard LED Indicators

DDR3 DIMM Fault LED

Each of the 16 DDR3 DIMM slots on the motherboard has an amber fault LED associated with it. If a DIMM is faulty, pressing the Fault Remind button on the motherboard signals the service processor to light the fault LEDs associated with the faulted DIMMs.

Processor Fault LED

The motherboard includes a fault status indicator (LED) next to each of the two processor (CPU) sockets.

These LEDs indicate when a processor is faulty. For example, if on reboot the BIOS detects that there are uncorrectable processor errors recorded in the machine check architecture (MCA) registers apparently left over from the previous boot, then the BIOS records and diagnoses these errors.

If it is determined that a processor is faulty, pressing the Fault Remind button on the motherboard signals the service processor to light the fault LED associated with the faulted processor.

Fault Remind Power LED

This LED is located next to the Fault Remind button and is powered from the super capacitor that powers the fault LEDs on the motherboard. This LED lights to indicate that the fault remind circuitry is working properly in cases where no components have failed and, as a result, none of the component fault LEDs illuminate.

Standby Power Good LED

The service instructions for all internal components require that all AC power is removed from the power supplies before the top cover of the Pilot is removed.

This green LED is labeled STBY PWRGD and is located on the back of the Pilot near PCIe slot 2.

This LED lights to inform a service technician that the motherboard is receiving standby power from at least one of the power supplies. This LED is provided to help prevent service actions on the Pilot’s internal components while the AC power cords are installed and power is being supplied to the Pilot.