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Cisco 3845 Hardware Guide - Page 112

Removing the Plug-In Motherboard from a Cisco3845Router

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Removing the Plug-In Motherboard from a Cisco 3845 Router Step 1 Step 2 Remove the router cover, following the procedure in the "Removing the Cover from a Cisco 3825 Router" section on page 80. 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 2 2 1 NE36SMWD-- 35x GE1 1B0a/s1e0-0T/x1000 17x 35x 17x 34x 16x 33x 15x 32x 14x 31x 13x 30x 12x FastEthernet Ports 29x 11x 28x 10x 27x 9x 26x 8x 25x 17 24x 6x 18x 23x 5x 22x 4x 21x 3x 20x 2x 19x 1x 0x 18x 0x -48V Ext Pwr GE0 11B00a/0s10e0-0T/x EN 117946 1 Power supply 2 Captive mounting screws Step 3 Step 4 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. 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 Step 2 Using the number 2 Phillips screwdriver, loosen the two captive thumbscrews, one on each side of the motherboard. (See Figure 50.) 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 82 OL-5975-04

Section	Page
Introduction to Cisco3800 Series Routers Hardware Documentation	1
Objectives and Organization	1
Audience	2
Conventions	2
Safety Warnings	3
Related Documentation	10
Obtaining Documentation	11
Cisco.com	11
Ordering Documentation	11
Documentation Feedback	12
Obtaining Technical Assistance	12
Cisco Technical Support Website	12
Submitting a Service Request	12
Definitions of Service Request Severity	13
Obtaining Additional Publications and Information	13
Overview of Cisco3800 Series Routers	15
Router Descriptions	15
Product Identification	19
Cisco Product Identification Tool	20
Built-In Ports	20
Module and Interface Card Capacity	21
Network Modules	21
Interface Cards	22
AIMS and PVDMs	23
Port Numbering	23
Built-In Ports	23
Network Module Ports	23
Interface Card Ports	24
Interface Card in Router	24
Interface Card in Network Module	24
Asynchronous Interface Numbering	24
Memory	25
Power	25
LED Indicators	26
Ventilation	26
Real-Time Clock and Battery	26
Technical Specifications	26
Regulatory Compliance	29
Preinstallation Requirements and Planning for Cisco3800 Series Routers	31
Safety Recommendations	31
Safety with Electricity	32
Preventing Electrostatic Discharge Damage	33
General Site Requirements	33
Power Supply Considerations	33
Site Environment	34
Site Configuration	35
Equipment Racks	35
Installation Checklist	36
Creating a Site Log	37
Inspecting the Router	37
Required Tools and Equipment for Installation and Maintenance	38
Installing Cisco3800 Series Routers in an Equipment Rack	39
Rack-Mounting the Router	40
Attaching Brackets to the Router for Rack Mounting	41
Installing the Router in a Rack	43
Attaching the Optional Cable Management Bracket	44
Grounding the Router	44
Connecting Cables to Cisco3800 Series Routers	49
Power Connections	49
Connecting Routers to AC Power	50
Connecting Routers to DC Power	50
DC Wiring Requirements for Cisco3800 Series Routers	50
DC Input Wiring Procedure	52
Dual DC Power Supply Configuration in Cisco 3825 Routers	54
Connecting Routers to Backup Power	57
Connecting WAN, LAN, and Voice Cables	58
Connecting a Console or Modem	59
Connecting a Console to the Console Port	60
Connecting a Modem to the Auxiliary Port	61
Powering Up Cisco3800SeriesRouters	63
Prerequisites	63
Power-Up Procedure	64
Verifying LED Indications	64
Verifying the Hardware Configuration	66
Setting the Date and Time	66
Troubleshooting Cisco3800 Series Routers	67
Solving Problems	68
Troubleshooting the Power and Cooling Systems	68
Normal Indications	68
Fault Indications	68
Environmental Reporting Features	69
Troubleshooting Modules, Cables, and Connections	70
LEDs	71
The show environment Command	75
Error Messages	76
Cisco3845 Router Error Messages	77
Jumper Settings	78
Recovering a Lost Password	79
More Troubleshooting Help	79
Installing Network Modules in Cisco3800 Series Routers	81
Installing Network Modules	81
Modifying the Width of Network Module Slots	83
Installing and Removing Slot Dividers	85
Installing Slot Dividers	86
Removing Slot Dividers	88
Installing and Removing Slot Adapters	89
Installing Slot Adapters	89
Removing Slot Adapters	90
Installing Blank Faceplates	90
Installing Interface Cards in Cisco3800 Series Routers	91
Installing Interface Cards	91
Installing and Removing Slot Dividers	92
Installing Slot Dividers in HWIC Slots	92
Removing Slot Dividers from HWIC Slots	96
Installing Blank Faceplates over Empty HWIC Slots	97
Installing SFP Modules in Cisco3800 Series Routers	99
Laser Safety Guidelines	100
Installing SFP Modules	100
Removing SFP Modules	101
Installing CompactFlash Memory Cards in Cisco3800 Series Routers	103
Preventing Electrostatic Discharge Damage	103
Removing CompactFlash Memory Cards	104
Installing CompactFlash Memory Cards	105
Using the Compact Flash Guard	106
Installing and Upgrading Internal Components in Cisco3800Series Routers	107
Safety Warnings	108
Safety with Electricity	109
Preventing Electrostatic Discharge Damage	110
Removing the Cover from a Cisco3825 Router	110
Removing the Power Supply Assembly from a Cisco3825 Router	111
Removing the Plug-In Motherboard from a Cisco3845Router	112
Component Locations on the Motherboard	113
SDRAM DIMM Removal and Installation	115
DIMM Location and Orientation	116
Removing an SDRAM DIMM	116
Installing an SDRAM DIMM	117
AIM Installation and Removal	118
Overview	118
Accessory Kits	118
Installing an AIM	118
Connecting the AIM to the Motherboard	119
Verifying AIM Installation	123
Applying the AIM Label	123
Removing an AIM	124
Installing a CompactFlash Memory Card on the AIM	125
PVDM Installation and Removal	126
PVDM Location and Orientation	126
Installing a PVDM	127
Removing a PVDM	128
Installing a Power Supply in a Cisco3825 Router	128
Removing the Existing Power Supply	129
Installing an AC Power Supply	129
Installing a DC Power Supply	131
Installing an IP Phone Power Supply	133
Reinstalling the Power Supply Assembly in a Cisco3825 Router	135
Reinstalling the Cover on a Cisco3825 Router	135
Installing or Replacing the Plug-In Motherboard in a Cisco3845Router	135

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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.

Power supply

Captive mounting screws

117946

NMD-

ESW-

23x

FastEthernet Ports

22x

21x

20x

19x

18x

29x

11x

28x

10x

27x

26x

25x

24x

35x

17x

34x

16x

33x 15x

32x

14x

31x

13x

30x

12x

Ext

Pwr

-48V

18x

GE0

10/100/

1000

Base-Tx

35x

10/100/1000

Base-Tx

GE1

17x

Cisco 3845 Hardware Guide - Page 112

Removing the Plug-In Motherboard from a Cisco3845Router

Page 112 highlights

Removing the Plug-In Motherboard from a Cisco3845Router