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

NMD- ESW- 36

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

 

 

 

 

 

 

 

 

 

 

2

 

 

 

 

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GE1

35x

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10/100/1000

17x

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ports

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Base-Tx

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

35x

17x

34x

16x

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

33x

15x

32x

14x

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

31x

13x

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

30x

12x

29x

11x

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

18x

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

28x

10x

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

27x

9x

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ext

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

26x 8x

25x

17

 

 

 

 

 

 

 

 

 

 

 

 

-48V

Pwr

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

24x

6x

 

 

 

 

 

 

 

 

 

 

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21x 3x

 

 

 

 

 

 

 

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20x

2x

 

 

 

0x

 

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19x

1x

 

 

EN

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

18x

0x

 

117946

1

Power supply

2

Captive mounting screws

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.

Installing and Upgrading Internal Components in Cisco 3800 Series Routers

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Cisco Systems 3800 Series warranty Removing the Plug-In Motherboard from a Cisco 3845 Router