Specifications

30 Memory Replacement Instructions for the Network Processing Engine and Input/Output Controller
Removing and Replacing Memory DRAM SIMMs, SDRAM DIMMs, and Boot ROMs
Step 8 Place the network processing engine on an antistatic surface with its printed circuit board
components facing upward.
This completes the procedure for removing the network processing engine.
Removing DRAM or Flash SIMMs
This section explains how to remove DRAM SIMMs that are installed on the I/O controller and the
network processing engine (NPE-100, NPE-150, and NPE-200). To remove the installed SIMMs,
complete the following steps:
Note The NPE-175, NPE-225, and NPE-300 use SDRAM DIMMS. Refer to the “Removing
SDRAM DIMMs” section on page 33 for DIMM replacement instructions.
Step 1 Attach an ESD-preventive wrist strap between you and an unpainted router surface.
Step 2 Place the I/O controller or the network processing engine on an antistatic mat or surface
(ensure that you are wearing an antistatic device, such as a wrist strap).
Step 3 Position the I/O controller or the network processing engine so that the handle is away
from you and the edge connector is toward you.
Step 4 Locate the SIMMs.
• The Flash SIMM on the I/O controller occupies socket U99 (see Figure 1).
• The DRAM SIMMs on the network processor engine occupy the following sockets:
U18, U25, U4, and U12 on the NPE-100 and the NPE-150 (see Figure 2 and Figure 3).
U11, U25, U42, and U52 on the NPE-200 (see Figure 5).
Note SIMMs installed in your system might look different from the SIMMS shown in
the following illustrations.
Step 5 Release the spring clips from the SIMM that you want to remove, and release the SIMM
from the socket. (See Figure 21.)