Sun Microsystems Cobalt LX50, User Manual

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Server Main Board Fault LEDs
User Guide—Sun Cobalt LX50 Server 6-5
Server Main Board Fault LEDs
There are several fault LEDs built into the server board (see Figure 83). Some of these LEDs are visible only when
the chassis cover is removed. The LEDs are explained in this section.
Figure 83. Fault LEDs on the Server Board
The fault LEDs are summarized below. See the Sun Cobalt LX50 server Troubleshooting Guide for a complete
description.
• POST Code LEDs: The server board includes an enhanced diagnostic feature that consists of a hardware
decoder and four LEDs located at the back of the server board. As the BIOS tests specific areas, the code is
displayed at the onset of the BIOS routine. If the BIOS hangs, the display shows which operation was in process.
• Processor Fault LEDs: A fault indicator LED is located next to each of the processor sockets. If the server
Baseboard Management Controller (BMC) detects a fault in any processor, the corresponding LED illuminates.
• Memory Fault LEDs: A fault indicator LED is located next to each of the DIMM sockets. If the BMC detects a
fault in a given DIMM, the corresponding LED illuminates.
• Fan Fault LEDs: A fault indicator LED is located next to each fan header. When the BMC detects a fan fault, the
corresponding LED illuminates. If any fan fault LED is lit, the entire fan module must be replaced.
• System Status LED: Indicates functional status of the server board. Glows green when all systems are operating
normally. Glows amber when one or more systems are in a fault status. This LED mirrors the function of the
system status LED on the front panel.
• +5 V Standby LED . This LED is on when the server is plugged into AC power, whether or not the server is
actually powered on.
Fan Fault LEDs (6)
System ID LED
Beeper
POST LEDs (4) System Status LED
Processor Fault LEDs (2)
Memory Fault LEDs (6)
5V Standby LED