Checking LEDs

Light emitting diodes (LEDs) provide status information on each array tray and its components. Green lights indicate a normal operating status, and amber lights indicate a hardware fault. Always check the status lights on the front and back of each array tray whenever you turn on the power. During power-up, the lights blink intermittently as the array and components complete the power-up process.


Caution -

Electrostatic discharge can damage sensitive components. Touching the command tray or its components without using a proper ground may damage the equipment. To avoid damage, use proper antistatic protection before handling any components.


Use the following procedure to check the lights on the front and back of the array:

  1. Before checking for faults, wait until the lights stop blinking. The Heartbeat light on the back of controller will continue to blink.
  2. Locate the Link Rate light at the back of the array, between the two power supplies, and make sure that the 2 Gb link rate LED is list.
  3. If the 2 Gb LED is not list, set it as follows:
    1. Remove the screws and the switch cover.
    2. Set the link rate to 2 Gb.
    3. Replace the switch cover and tighten the screw to secure it.
  4. Check that no amber LEDs are lit on the front or back of the array. If an amber LED is lit, contact your Sun service representative.

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