Cisco Firepower 3500 Appendix

APPENDIX

A

Replacing a RAID Battery Backup Unit
Assembly on the Firepower Management
Center 3500

Use these instructions to replace the RAID battery backup unit (BBU) assembly on Firepower
Management Center 3500. You should power down the device before you replace the BBU assembly
during a maintenance window. See the following sections for more information:

• BBU Overview, page A-1

• Working in an ESD Environment, page A-1

• Safety Warnings, page A-2

• Preparing to Replace the BBU, page A-2

• BBU Replacement Instructions, page A-4

• Monitoring the BBU, page A-10

BBU Overview

The Firepower Management Center 3500 contains a battery backup unit (BBU) that protects the integrity
of cached data on the RAID controllers by providing backup power if there is a complete loss of AC
power or a brief power interruption. Cisco recommends that you replace this BBU once a year.

A new BBU replacement assembly is available from Cisco. The assembly includes a new BBU model
(BBU8) with a five year lifespan and a new plastic battery tray. The BBU is held in place in the plastic
battery tray (see in Figure A-1) that securely locks into the base of the Firepower MC3500 chassis. You
remove the installed BBU and tray and replace them with the new BBU assembly.

Working in an ESD Environment

Electrostatic discharge (ESD) can damage equipment and impair electrical circuitry. ESD damage occurs
when electronic components are improperly handled and can result in complete or intermittent failures.
Always follow ESD-prevention procedures when you remove and replace components. Ensure that the
chassis is electrically connected to earth ground. Wear an ESD-preventive wrist strap, ensuring that it
makes good skin contact. Connect the grounding clip to an unpainted surface of the chassis frame to

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Appendix A Replacing a RAID Battery Backup Unit Assembly on the Firepower Management Center 3500

Safety Warnings

safely ground unwanted ESD voltages. To guard against ESD damage and shocks, the wrist strap and
cord must operate properly. If no wrist strap is available, ground yourself by touching the metal part of
the chassis.

Caution For the safety of your equipment, periodically check the resistance value of the anti-static strap. It should

be between 1 and 10 megohms (Mohm).

Safety Warnings

This section contains important safety warnings for the installation and use of the appliance.

Warning

Warning

Warning

Warning

Warning

Before working on a system that has an On/Off switch, turn OFF the power and unplug the power
cord. Statement 1

Only trained and qualified personnel should be allowed to install, replace, or service this
equipment. Statement 1030

This equipment must be grounded. Never defeat the ground conductor or operate the equipment
in the absence of a suitably installed ground conductor. Contact the appropriate electrical
inspection authority or an electrician if you are uncertain that suitable grounding is available.
Statement 1024

Do not work on the system or connect or disconnect cables during periods of lightning activity.
Statement 1001

Read the installation instructions before connecting the system to the power source. Statement
1004

Warning

Ultimate disposal of this product should be handled according to all national laws and
regulations. Statement 1040

Preparing to Replace the BBU

Tools You Supply

You must provide a #2 Phillips screwdriver and a razor knife to replace the BBU.

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Appendix A Replacing a RAID Battery Backup Unit Assembly on the Firepower Management Center 3500

BBU Components

The following illustration shows the BBU assembly components you should be familiar with when
replacing the BBU.

Figure A-1 BBU Assembly Components

Preparing to Replace the BBU

1 BBU tray 2 BBU
3 BBU wire connector and cable — —

Firepower Management Center 3500 Components

This section helps you identify the components of your Firepower MC3500 system. If you are near the
system, you can also use the Quick Reference Label provided on the inside of the chassis cover to assist
in identifying components.

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BBU Replacement Instructions

Figure A-2 MC3500 Chassis Components

Appendix A Replacing a RAID Battery Backup Unit Assembly on the Firepower Management Center 3500

1 Rack handles 9 Processor air duct
2 Power supply air duct 10 Processor and heatsink
3 Battery backup unit (BBU) assembly 11 System memory
4 Drive bay 12 Bridge board
5 Power distribution board 13 Fan assembly
6 Power supply modules 14 Midplane board
7 Server board 15 Mini control panel
8 PCI riser assembly 16 Disk drive bays

BBU Replacement Instructions

The following sections explain how to replace the RAID BBU in your Firepower MC3500. Follow the
instructions in the order presented:

• Removing the Cover, page A-5

• Removing the Power Supply Air Duct, page A-5

• Removing the Old BBU Assembly, page A-6

• Installing the New BBU Assembly, page A-7

• Replacing the Power Supply Air Duct, page A-8

• Replacing the Cover, page A-9

• Disposing the Old BBU, page A-10

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