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.
For an overview video about replacing a failed DIMM, see Replacing DIMMs
Prepare the server for warm or cold service. See Prepare the Server for Warm Service or Prepare the Server for Cold Service.
Remove the CMOD that contains the failed DIMM. See Remove a CMOD.
To remove the CMOD top cover, push the release button, slide the CMOD
cover toward the back of the CMOD, and lift it away.
Component damage. CMOD components are extremely sensitive to
electrostatic discharge. Wear a wrist strap and use an anti-static wrist
See Remove and Install the CMOD Cover.
To locate the failed DIMM, press and hold the Fault Remind button
Fault Remind button
Fault Remind Power indicator
DIMM slot fault indicator (one for each slot)
Verify that the green Fault Remind Power indicator  is lit.
The Charge Status indicator  lights if the Fault Remind circuit is
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.
With the Fault Remind button pressed, look for a lit DIMM fault indicator
The indicators are located next to the DIMM slots.
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.
Remove the DIMM from the CMOD.
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.
To install the DIMM in the slot, simultaneously press down on both edges
of the DIMM, so the DIMM enters the slot evenly.
This action forces the DIMM into the slot and causes the two slot levers
to rise and lock the DIMM in the slot.
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.
To align the CMOD cover, position it over the CMOD with the lip end of the
cover toward the front of the CMOD.
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
To lock the cover, slide it toward the front of the CMOD until it locks
This action is accompanied by an audible click.