Remove a DIMM

Use this information to remove a DIMM.

Before you remove a DIMM, complete the following steps:
  1. Read Safety and Installation Guidelines to ensure that you work safely.

  2. Power off the corresponding compute node that you are going to perform the task on.

  3. Remove the compute node from the chassis (see Remove the compute node from the chassis).

  4. Carefully lay the compute node on a flat, static-protective surface, orienting the compute node with the bezel pointing toward you.
  5. Remove the compute node cover (see Remove the compute node cover).

Attention: Memory modules are sensitive to static discharge and require special handling. In addition to the standard guidelines for Handling static-sensitive devices:
  • Always wear an electrostatic-discharge strap when removing or installing memory modules. Electrostatic-discharge gloves can also be used.

  • Never hold two or more memory modules together so that they touch. Do not stack memory modules directly on top of each other during storage.

  • Never touch the gold memory module connector contacts or allow these contacts to touch the outside of the memory-module connector housing.

  • Handle memory modules with care: never bend, twist, or drop a memory module.

After you install or remove a DIMM, you must change and save the new configuration information by using the Setup utility. When you turn on the compute node, a message indicates that the memory configuration has changed. Start the Setup utility and select Save Settings (see the Lenovo ThinkSystem SN550 Type 7X16 Setup Guide for more information) to save changes.

To remove a DIMM, complete the following steps:

Watch the procedure. A video of the installation process is available:
Note: Remove or install DIMMs for one processor at a time.

  1. Remove the air baffle (see Remove the air baffle for instructions).
  2. Locate the DIMM connectors (see System-board connectors). Determine which DIMM you want to remove from the compute node.
    Attention: To avoid breaking the retaining clips or damaging the DIMM connectors, handle the clips gently.
    Note: The retaining clips for adjacent DIMM connectors of processor one and processor two can not be open at the same time. Remove or install the DIMMs for each processor one at a time and close the retaining clips after removing a DIMM.
  3. Carefully open the retaining clips on each end of the DIMM connector.
    Figure 1. Opening retaining clip
    Opening retaining clip
    Attention: If necessary, due to space constraints, you can use a pointed tool to open the retaining clips. Place the tip of the tool in the recess on the top of the retaining clip; then, carefully rotate the retaining clip away from the DIMM connector. Pencils are not recommended, as they may not be strong enough.
  4. Make sure that both retaining clips on the DIMM connector from which you are removing the DIMM are in the fully-open position; then, pull the DIMM out of the connector.
    Figure 2. DIMM removal
    DIMM removal
    Attention: To maintain proper system cooling, do not operate the compute node without an air baffle installed over the DIMM connectors.
    Note:
    • If you are not immediately replacing the DIMM, install the air baffle (see Install the air baffle).
    • Retaining clips on the DIMM connectors must be in the closed position to install the air baffle.

If you are instructed to return the component or optional device, follow all packaging instructions, and use any packaging materials for shipping that are supplied to you.