Sun Microsystems, Inc.   Sun System Handbook - ISO 3.4 June 2011 Internal/Partner Edition
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Enterprise XX00 LEDs

The following LED information pertains to the Enterprise 3000/4000/5000/6000 and Enterprise 3500/4500/5500/6500 systems.

Front Panel and Board LED Symbols

Front Panel and Clock+ Board LEDs

Power  Service Running
Condition
Off
Off
Off
 No power or the key switch is in the Off position. 
Off
On
Off
 Failure mode. System has electrical power. 
Off
Off
On
 Failure mode. System has electrical power. 
Off
On
On
 Failure mode. System has electrical power. 
On
Off
Off
 System is hung, either in POST/OBP or in the operating system. 
On
Off
On
 Hung in OS.
On
On
Off
 (Hung in POST/OBP) or (hung in OS and failed component in system).
On
On
On
 (Hung in POST/OBP) or (hung in OS and failed component in system).
On
Off
Flashing
 OS running. System is operating normally. 
On
On
Flashing
 OS running and failed component in system. 
On
Flashing
Off
 Slow flash = POST. Fast flash = OBP. 
On
Flashing
On
 OS or OBP error. 

LEDs in the system are controlled by OpenBoot(tm) PROM programming (OBP).

CPU/Memory+ and I/O+ Board LEDs

The Power, Service, and Cycling symbols are marked on the card cage frame above the respective LEDs.

Power  Service Running
Condition
Off
Off
Off
 Board has no electrical power.
Off
On
Off
 Board is in low-power mode, can be unplugged.
Off
Off
Flashing
 Undefined.
Off
On
Flashing
 Undefined.
On
Off
Off
 System is hanging, either in POST/OBP or OS. 
On
Off
On
 Hung in OS.
On
On
Off
 (Hung in POST/OBP) or (hung in OS and failed component on board).
On
On
On
 (Hung in POST/OBP) or (hung in OS and failed component on board).
On
Off
Flashing
 OS running. System is operating normally. 
On
On
Flashing
 OS running and failed component on board. 
On
Flash
Off
 Slow flash = POST. Fast flash = OBP. 
On
Flash
On
 OS or OBP error. 

Low Power Mode - If the status of the LEDs on the board is off-on-off, this means the board is in low power mode. This occurs when the board is disabled because it failed POST, or if the board was just inserted. Low power mode is the only state in which you may unplug the board while the system is running.

CAUTION - If the Power LED is lit, do not remove the board. Removing a board that is not in low-power mode will damage the board and the system.

Basic Troubleshooting for Boards

  • If the yellow LED (middle LED) is continuously lit (not flashing) the board may require service.
    Further analysis is needed to determine cause of failure.
  • If the left and right green LEDs are off, the board is ready for removal.
  • If no LEDs are flashing, the system is hung.
  • If no LEDs are lit, there is no electrical power to the board.

Disk Board LEDs

The board status LED codes correspond to those shown in the CPU/Memory+ and I/O+ Boards LEDs table. The Disk board has two additional LEDs on the opposite side of the board to show the status of the two onboard disk drives. The LED for disk drive 1 is nearer to the side of the Disk board, and the LED for disk drive 0 is closer to the center of the board.

Note: The yellow LED on disk boards installed in Ultra Enterprise servers will remain on when the Ultra Enterprise server is running Solaris 2.6 5/98 or above. This is normal, and it indicates the board is in low power mode (the board can be removed from the system provided the disks have been idled).

  1. The normal LED pattern is On-Off-On prior to Solaris 2.6 HW 5/98.
  2. The normal LED pattern is Off-On-Off in Solaris >=2.6 HW 5/98.

Power Supply LEDs

A system has one peripheral power supply and up to four or eight CPU/IO modular power supplies. All the power supplies have one green LED and one yellow LED.

The control and status signals of all power supply modules connect to the clock+ board. If the clock+ board LEDs indicate a problem, inspect the LEDs on the power supplies to locate a faulty module, if any.

Peripheral Power Supply (PPS)

The green LED is to the right of the yellow LED on the peripheral power supply. The green LED indicates that the peripheral power supply is operating, but does not necessarily indicate that the DC outputs are within specification.

When the peripheral power supply module yellow LED is lit, a DC power output has malfunctioned or the voltage level is out of specification.

The peripheral power supply produces +5 VDC and +12 VDC current. The current is available for peripherals such as a tape drive and/or CD-ROM drive. In addition, the +5 VDC output of the peripheral power supply is available at the center plane for current sharing with the +5 VDC outputs of the power supply modules.

Power/Cooling Modules (PCMs)

For a PCM at the front of the card cage, the green LED is to the left of the yellow LED. At the back of the card cage, the LED positions are reversed and the green LED is to the right of the yellow LED.

When the yellow LED is lit, a fan or a DC output has malfunctioned. Each modular power supply contains two fans and three DC supplies (+3.3 VDC, +5 VDC, and +2 VDC).

The green LED indicates that the DC supplies are operating, but does not guarantee that the DC outputs are within specification.

Modular Power Supply LED Code

Green Yellow 
Condition
Off
Off
 No AC input or key switch is turned off.
On
Off
 Normal operation.
On
On
 A fan has failed or one or more voltages are out of specification.
Off
On
 One or more DC outputs have failed, or the voltages are out of specification, or the system is in the low power state. 

The PCMs operate in redundant current share mode. If a module fails, the remaining modules may or may not provide enough current to continue system operation. The system's ability to continue operations depends on the total demand for current.

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