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Installing and Upgrading Internal Components in
Cisco 3800 Series Routers
This document describes how to install or upgrade components located inside Cisco 3800 series
integrated services routers:
• SDRAM DIMM memory modules
• Advanced integration modules (AIMs)
• Packet voice data modules (PVDMs)
• Power supplies
• Motherboard (Cisco 3845 router only)
• Fan tray (Cisco 3845 router only)
For information about router SDRAM, AIM, PVDM, and power supply capacity, see the following
sections of the “Overview of Cisco 3800 Series Routers” document:
• The “Module and Interface Card Capacity” section on page 7
• The “Memory” section on page 11
• The “Power” section on page 11
The procedures for installing or removing these components depend on your router model:
• For the Cisco 3825 router, you must remove the router cover to access the power supply and
motherboard. Follow the “Removing the Cover from a Cisco 3825 Router” procedure on page 80.
You must then remove the power supply, together with its tray, to access memory modules, AIMs,
and PVDMs on the motherboard, or to replace the power supply. Follow the “Removing the Power
Supply Assembly from a Cisco 3825 Router” procedure on page 81.
• The Cisco 3845 router motherboard slides out from the rear of the router to give access to memory
modules, AIMs, and PVDMs, or to replace the motherboard. Follow the “Removing the Plug-In
Motherboard from a Cisco 3845 Router” procedure on page 82.
• The Cisco 3845 router fan tray and power supplies are reached from the front of the router. Follow
the “Removing and Installing the Fan Tray and Power Supplies in a Cisco 3845 Router” procedure
on page 106.
This document contains the following sections:
• Safety Warnings, page 78
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