Memory DIMM

Use this procedure to service a memory DIMM.

1. Shut down the partitions and power off the system

   This FRU cannot be serviced concurrently. Every partition must be shut down and the system powered off to continue the repair. Authorization must come from the customer to shut down all running partitions and power off the system. If the customer will not allow the partitions to be shut down or the system to be powered off, delay the service procedure. If the customer is using a secondary HMC to manage the system, make sure they are not powering on the system at this time.

2. Disconnect the power cords

   Open the back rack door on the unit you are servicing. Identify the system unit you are servicing in the rack. Disconnect all power cords from the unit you are servicing.

3. Place into service position

   Note to expansion unit users: The instructions in this procedure are written based on the rack model. Expansion unit users can still use this procedure. However, users of expansion units should ignore specific references to rack-only features, such as rack doors, rack thumbscrews, and rack-specific FRU orientation. Open the front rack door. Identify the system unit you are servicing in the rack. Remove the two screws (A) (if present) that secure the system unit (B) to the rack.

4. Place into service position (continued)

   Notes: When placing the system into the service position, it is essential that all stability plates are firmly in position to prevent the rack from toppling. Ensure that only one system unit is in the service position at a time. Ensure that the cables at the back of the system unit do not catch or bind as you pull the unit forward in the rack. When the system unit rails are fully extended, the rail safety latches lock into place. This action prevents the system from being pulled out too far. While holding the system unit release latches (A) down on both the left and right sides, pull the system unit (B) out from the rack until the rails are fully extended and locked.

5. Remove the service access cover

   Loosen the two thumbscrews (A) located at the back of the cover. Slide the cover (B) toward the back of the system unit. When the front of the service access cover has cleared the upper frame ledge, lift the cover up and off the system unit. Attention: For proper cooling and air flow, re-install the cover before turning on the system. Operating the system without the cover for more than 30 minutes could damage the system components.

6. Remove the fans

   Push the latch (A) upward to disengage the fan from the fan cage. Pull the fan (B) out of the fan cage. Repeat these steps until all fans are removed from the fan cage.

7. Remove the fan cage

   Pull the four retaining tabs (A) that secure the fan cage to its enclosure. Lift the fan cage (B) straight up and out of the enclosure.

8. Remove the memory DIMM

   Locate the memory DIMM you want to remove. Remove the memory DIMM by pushing the tabs (A) out and then down. The tabs' lever action forces the memory DIMM out of the connector. Pull the memory DIMM (B) out of the connector.

9. Install the memory DIMM

   Note: Memory DIMMs are keyed to prevent a DIMM from being installed incorrectly. Note the locations of the key tabs within the DIMM connector before attempting to install the DIMM. Ensure that the connector locking tabs (A) are pushed out in the unlocked position before installing a new memory DIMM. Carefully grasp the memory DIMM (B) along two edges and align the connector. Insert the memory DIMM firmly into the connector. Secure the memory DIMM by pushing in the locking tabs (A).

10. Install the fan cage

    Check that the four retaining tabs are in open position. Lower the fan cage (A) into its location on the enclosure, aligning the blue tabs with the holes. Push firmly on the fan cage so that you are sure it fits into its position. Tighten the four retaining tabs (B) securing the fan cage to its enclosure.

11. Install the fans

    Lower the fan (A) into its location in the fan cage. Push down on the fan until it locks into place. Secure the fan by closing the latch (B). Repeat these steps until all fans are installed.

12. Install the service access cover

    Place the service access cover (A) on top of the system, about 25 mm (1 in.) from the upper chassis ledge. Hold the service access cover against the system unit and slide it toward the front of the system. The tabs of the service access cover slide beneath the upper chassis ledge. Align the two thumbscrews (B) located on the back of the service access cover with the two holes on the back of the system chassis. Tighten the thumbscrews to secure the service access cover.

13. Place into operating position

    Note: When placing the system into operating position, ensure that the cables at the back of the system do not catch or bind as you push the system unit back into the rack. Unlock the rail safety latches (B) by sliding them toward the front of the system. Push the system unit (A) back into the rack until both system-unit release latches have locked into position.

14. Place into operating position (continued)

    Replace and tighten the two screws (B) that secure the system unit (A) to the rack. Close the front rack door of the unit you are servicing.

15. Install the power cords

    If you removed the power cords, perform the following steps. Identify the system unit you are servicing in the rack. Connect all power cords to the unit you are servicing. Close the back rack door.

16. Go to Verifying a repair.