Installation guide

22 Upgrading Memory in Cisco 4000 Series Routers
Upgrading Main Memory
Upgrading Main Memory
A main-memory upgrade entails removing the existing main-memory SIMMs and replacing them
with the upgraded SIMMs. If you are upgrading a Cisco 4000 router, you must first remove the Flash
EPROM card. See the section “Removing the Flash EPROM Card” earlier in this document.
Removing Main-Memory SIMMs
Follow these steps to remove main-memory SIMMs:
Step 1 Find the main-memory SIMM sockets on the router’s motherboard, as shown at the upper
right of Figure 12, Figure 13, Figure 14, or Figure 15. These sockets hold the SIMMs
vertically.
Caution Handle SIMMs by the card edges only. SIMMs are ESD-sensitive components and can be
damaged by mishandling.
Step 2 Remove one SIMM at a time, beginning with the SIMM closest to the edge of the
motherboard in the Cisco 4000, and the SIMM farthest from the edge of the motherboard
in all other routers.
Step 3 To lift the SIMM out of its socket, pull the spring clips on both sides outward and tilt the
SIMM free of the clips, toward the right side in the Cisco 4000, as viewed from the front
of the router (see Figure 17), and toward the left side in all other routers (see Figure 18).
Step 4 Hold the SIMM by the edges with your thumb and index finger and lift it out of the socket.
Place the removed SIMM in an antistatic bag to protect it from ESD damage.
Step 5 Repeat Step 2 through Step 4 for any remaining main-memory SIMMs.
Figure 17 Removing Main Memory SIMMs (Cisco 4000)
2. Push the top of the
SIMM forward.
1. Pull the locking
spring clips outward.
SIMM
polarization
notch
Top view
Front of chassis
H9406