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Oracle® Server X5-8 Service Manual

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Updated: March 2018

Replace a Failed DIMM

This procedure uses the DIMM fault remind test circuit in the CMOD to identify the failed DIMM. The circuit is a charged, time-limited circuit. Once power is removed from the server you have 10 minutes to use the circuit.

Use this procedure to replace or reset a DIMM.

Before You Begin

  • For component information, see About System Components.

  • Use Oracle ILOM to identify the location of the failed DIMM and obtain CMOD designation information.

Tip  -  For an overview video about replacing a failed DIMM, see Replacing DIMMs.
  1. Prepare the server for warm or cold service. See Prepare the Server for Warm Service or Prepare the Server for Cold Service.
  2. Remove the CMOD that contains the failed DIMM. See Remove a CMOD.
  3. To remove the CMOD top cover, push the release button, slide the CMOD cover toward the back of the CMOD, and lift it away.


    Caution  -  Component damage. CMOD components are extremely sensitive to electrostatic discharge. Wear a wrist strap and use an anti-static wrist mat.

    See Remove and Install the CMOD Cover.

    image:An illustration showing how to remove the CMOD cover.
  4. To locate the failed DIMM, press and hold the Fault Remind button [1].
    image:An illustration with call outs showing the location of the                                 components in the DIMM Fault Remind test circuit.
    Call Out
    Fault Remind button
    Fault Remind Power indicator
    DIMM slot fault indicator (one for each slot)
  5. Verify that the green Fault Remind Power indicator [2] is lit.

    The Charge Status indicator [2] lights if the Fault Remind circuit is operational.

    The Fault Remind circuit remains charged for about 10 minutes after power is removed from the CMOD, either by disconnecting power from the server, or by removing the CMOD from the chassis. When you press the Fault Remind button, the Charge Status indicator lights if there is enough power to use the fault remind circuit. Otherwise it remains dark.

  6. With the Fault Remind button pressed, look for a lit DIMM fault indicator [3].

    The indicators are located next to the DIMM slots.

  7. To remove the failed DIMM from its slot, simultaneously rotate the two DIMM slot levers outward to their fully open position.

    This action extracts the DIMM from its connector.

    image:An illustration that shows DIMM slot ejector levers.
  8. Remove the DIMM from the CMOD.
    image:An illustration showing a DIMM being removed from its                                 slot.
  9. To align the replacement DIMM in the slot, ensure that the notch on the DIMM connector edge lines up with the key in the DIMM slot.
    image:An illustration showing the alignment of a DIMM in its                                 slot.
  10. To install the DIMM in the slot, simultaneously press down on both edges of the DIMM, so the DIMM enters the slot evenly.
    image:An illustration showing how to correctly insert a DIMM into its                                 slot.

    This action forces the DIMM into the slot and causes the two slot levers to rise and lock the DIMM in the slot.

    image:An illustration of the action described above.
  11. Verify that the DIMM sits evenly in the slot and is locked.

    Both levers should be in their fully closed and vertical position. In this position, the levers lock the DIMM in the slot.

  12. To align the CMOD cover, position it over the CMOD with the lip end of the cover toward the front of the CMOD.
  13. Set the cover on the CMOD so that the edges of the cover encapsulate the edges of the CMOD.

    When correctly seated, the cover extends slightly over the back end of the CMOD.

  14. To lock the cover, slide it toward the front of the CMOD until it locks into place.

    This action is accompanied by an audible click.

Next Steps