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Installing and Upgrading Internal Components in Cisco 3800 Series Routers
OL-5975-04
Removing the Plug-In Motherboard from a Cisco 3845 Router
Step 1 Remove the router cover, following the procedure in the “Removing the Cover from a Cisco 3825
Router” section on page 80.
Step 2 Locate the power supply assembly, shown in Figure 49. Remove any internal power cables from the
connectors at the corner of the power supply.
Figure 49 Cisco 3825 Power Supply
Step 3
Using a number 2 Phillips screwdriver, loosen the captive mounting screws on the power supply tray.
Lift the power supply assembly out of the router.
Step 4 To install or replace SDRAM DIMMs, AIMs, or PVDMs on the motherboard, continue with the
“Component Locations on the Motherboard” section on page 83. To install a new power supply,
continue with the “Installing a Power Supply in a Cisco 3825 Router” procedure on page 98.
Removing the Plug-In Motherboard from a Cisco 3845 Router
To access memory modules, AIMs, and PVDMs mounted on the motherboard of a Cisco 3845 router, or
to remove a motherboard to replace it with a new one, follow these steps. You need a number 2 Phillips
screwdriver. You do not need to remove the router from the rack.
It is not necessary to power off the router to remove the motherboard, but the router does not operate
until the motherboard is reinstalled.
Step 1 Using the number 2 Phillips screwdriver, loosen the two captive thumbscrews, one on each side of the
motherboard. (See Figure 50.)
Step 2 Rotate the ejector levers on each side outward, and carefully pull the motherboard straight out of the
router. Place it on an antistatic surface.
Caution The motherboard is an ESD-sensitive component. To avoid damage, observe all ESD precautions.
1 Power supply 2 Captive mounting screws
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