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Installing and Upgrading Internal Components in Cisco 3800 Series Routers
OL-5975-04
SDRAM DIMM Removal and Installation
DIMM Location and Orientation
The two SDRAM DIMM connectors are located on the motherboard and are identified as MEMORY 0
and MEMORY 1 on the Cisco 3825 router, and as MEM0 and MEM1 on the Cisco 3845 router. See
Figure 51 and Figure 52 for DIMM locations.
DRAM DIMMs have a polarization notch on the mating edge to prevent incorrect insertion. Figure 53
shows the polarization notch on a DRAM DIMM.
Figure 53 DRAM DIMM Polarization Notch
Removing an SDRAM DIMM
To remove an SDRAM DIMM from the motherboard, follow these steps:
Step 1 Pull the latches away from the DIMM at both ends. This lifts the DIMM slightly. Lift the DIMM
completely out of the connector. See Figure 54.
Figure 54 Removing a DRAM DIMM
Polarization notch
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1 Release the latches 2 Remove the DIMM
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