Motherboard Leds; Ddr3 Dimm Fault Leds; Cpu Fault Leds - Sun Oracle Sun Fire X4270 M2 Service Manual

1.5.5

Motherboard LEDs

The motherboard and modules that are installed on the motherboard contain several
LEDs, which are described in the following sections:
Section 1.5.5.1, "DDR3 DIMM Fault LEDs" on page 1-14
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Section 1.5.5.2, "CPU Fault LEDs" on page 1-14
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Section 1.5.5.3, "Fault Remind Super Capacitor Power LED" on page 1-15
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Section 1.5.5.4, "Connector Board 12V Power LEDs" on page 1-15
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Section 1.5.5.5, "Power distribution Board 5V Power LED" on page 1-15
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Section 1.5.5.6, "3.3V_STANDBY OK LED" on page 1-15
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Note – A super capacitor provides sufficient power for the motherboard LEDs to be
lit for up to 15 minutes after the removal of the server's top cover. After 15 minutes,
the capacitor might be discharged enough so that lighting the fault LEDs is not
possible.
1.5.5.1

DDR3 DIMM Fault LEDs

Each of the 18 DDR3 DIMM slots on the motherboard has an amber fault LED
associated with it. If ILOM determines that a DIMM is faulty, pressing the Fault
Remind button on the motherboard signals the service processor to light the fault
LED(s) associated with the faulted DIMM(s).
1.5.5.2

CPU Fault LEDs

The motherboard includes a fault LED adjacent to each of the two CPU sockets.
These LEDs indicate when a CPU is faulty. For example, if on reboot the BIOS detects
that there are uncorrectable CPU errors recorded in the MCA registers apparently left
over from the previous boot, then the BIOS and ILOM work together to record and
diagnose these errors. If it is determined that a CPU is faulty, pressing the Fault
Remind button on the motherboard signals the service processor to light the fault
LED(s) associated with the faulted CPU(s).
1-14 Sun Fire X4270 M2 Server Service Manual • May 2011