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Removing and Replacing Memory SIMMs and the Boot ROM
Use the following guidelines to ensure easy access to the rear of the router when it is installed in a
rack:
• Ensure that you have at least three to four feet of working space at the rear of the router.
• If cables from other equipment in the rack fall in front of the rear end of the router, carefully
gather the cables (using care not to strain them) and use cable ties to anchor them away from the
rear of the router.
• If access to the rear of the router is partially blocked by a power strip or some other permanent
rack fixture, detach the router from the rack and carefully slide it forward until there is enough
clearance to remove the power supply, the network processing engine, and the subchassis from
the router. Detailed steps for detaching the router from the rack are contained in the following
section “Removing the Network Processing Engine.”
Caution Make sure that at least one other person is available to support the front of the router as
you slide it out from the rack and, if necessary, to continue to support it while you remove and insert
the power supply, network processing engine, or subchassis.
Removing and Replacing Memory SIMMs and the Boot ROM
There is one Flash memory SIMM on the I/O controller (refer to Figure 5) and four main memory
(DRAM) SIMMs on the network processing engine (refer to Figure 6); the replacement instructions
are the same for the Flash memory and DRAM SIMMs.
The following sections explain how to remove and replace the Flash memory SIMM on the I/O
controller, and how to remove and replace the DRAM SIMMs from the network processing engine.
Removing and replacing the SIMMs involves the following steps:
1 Powering Down the Router and Disconnecting Input Power
2 Removing the Input/Output Controller
3 Removing the Network Processing Engine
4 Removing Memory SIMMs
5 Installing New Memory SIMMs
6 Removing the Boot ROM
7 Replacing the Input/Output Controller
8 Replacing the Network Processing Engine
9 Reconnecting Input Power and Powering Up the Router
These tasks are described in detail in the following subsections.
Note The tasks for removing and replacing the I/O controller and network processing engine in the
Cisco 7204 and the Cisco 7206 are the same. Therefore, the illustrations in the following sections
show the Cisco 7206, unless indicated otherwise.
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