General - Enterprise 250 LEDs

Front Panel LEDs

The LEDs consist of two types: system health indicators and fault indicators. The system health indicators light to show you that the system is functioning normally. The fault indicators light when a problem is detected in the system. Because it is important for you to know that a fault exists in the system, the fault indicators remain lit when the system is reset or switched to standby mode using the keyswitch.

When you first power on the system, the LEDs are individually toggled on and off to verify that each one is working correctly. After that, the LEDs operate as described in the following table.

Name

Icon

Description

Power-on

This green LED lights steadily when the system power is on and the keyswitch is in the On, Diagnostics, or Locked position.

General fault

This yellow LED blinks slowly while the system runs its power-on self-test (POST) diagnostics and blinks rapidly during OpenBoot diagnostic (OBDiag) tests. It lights steadily when any fault is detected (including a fault also reported by any other LED).

Activity

This green LED blinks continuously to indicate that the system is operating normally.

Disk fault

This yellow LED lights steadily to indicate a fault in one of the hard disk drives. When this LED is lit, one or more disk LEDs may also be lit, indicating the source of the fault.

Temperature fault

This yellow LED lights steadily to indicate an over-temperature condition in the system.

Power supply fault

This yellow LED lights steadily to indicate a power supply fault. LEDs on the rear of the power supply indicate the nature of the fault (and identify which supply is faulty in a system with two supplies).

Power Supply LEDs

Power supply LEDs are visible from the rear of the system. The following figure shows the LEDs on the power supply in bay 0.

Name

Icon

Description

AC-Present-Status

This green LED is lit to indicate that the primary circuit has power. When this LED is lit, the power supply is providing standby power to the system.

General fault

This green LED is lit to indicate that all DC outputs from the power supply are functional.

Disk LEDs

The disk LEDs are visible from the front of the system when the bottom door is open, as shown in the following figure.

When a disk LED lights steadily and is green, it indicates that the slot is populated and that the drive is receiving power. When an LED is green and blinking, it indicates that there is activity on the disk. Some applications may use the LED to indicate a fault on the disk drive. In this case, the LED changes color to yellow and remains lit. The disk drive LEDs retain their state even when the system is powered off.