Service manual

Chapter 10 Motherboard and Component Replacement 10-19
2. Locate and select an available quartet of DSIMM slots on the motherboard.
Note – Use only DSIMMs that are specifically designed for the system and server
units.
Caution – Hold DSIMMs by edges only.
3. Remove the DSIMM from the antistatic container.
Note – DSIMMs must be added in groups of four. If all four DSIMMs are not of the
same capacity, the four DSIMMs are treated as four times the lowest capacity
DSIMM in the group.
Caution – If the DSIMM is not seated into its slot evenly, it can cause electrical
shorts that will damage the system. Follow the procedure and refer to the illustration
at right to seat the DSIMM properly.
Failure to comply with these instructions can result in damage to system
components or assemblies and can void the warranty.
4. Install the DSIMM as follows:
a. Hold the DSIMM at the top left and right corners using the thumb and index
finger of each hand.
Note – Ensure that the DSIMM is being held straight and parallel to its slot.
b. For each DSIMM, align the notch on the side of the DSIMM with the ejector on
the DSIMM slot.
c. With even pressure, firmly push down simultaneously on both upper corners of
the DSIMM until the bottom edge of the DSIMM (the edge with the gold pads)
is firmly seated into the slot.
Note – Do not rock the DSIMM into place. Ensure that all contacts engage at the
same time. A “click” sound will be heard when the DSIMM is properly seated.
FIGURE 10-15 shows the incorrect and correct ways to seat the DSIMM.