Cisco 3825 Series Quick start guide

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Installing and Upgrading Fans in the Cisco 3825
Series Routers
This document describes how to install or upgrade fans inside your Cisco 3825 series router.
This document is intended for the fan installer who is familiar with electronic circuitry and wiring
practices and has experience as an electronic or electromechanical technician.
Note Use this document in conjunction with the following documents:
•Cisco 3800 Series Hardware Installation guide:
http://www.cisco.com/en/US/docs/routers/access/3800/hardware/installation/guide/hw.html
•Cisco 2800 Series and Cisco 3800 Series Integrated Services Routers Regulatory Compliance and
Safety Information document:
http://www.cisco.com/en/US/docs/routers/access/2800/hardware/rcsi/2838rcsi.html
If you have questions or need help, see the “Obtaining Documentation, Obtaining Support, and Security
Guidelines” section on page 18.
This document contains the following sections:
•Safety Warnings and Guidelines, page 2
•Items in the Fan Replacement Kit, page 10
•Required Tools and Equipment, page 10
•Location of the Cisco 3825 Router Fans, page 11
•Upgrading the Cisco 3825 Fan Unit, page 12
•Obtaining Documentation, Obtaining Support, and Security Guidelines, page 18.

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Safety Warnings and Guidelines
Safety Warnings and Guidelines
This section provides the safety warnings and guidelines for working with the Cisco 3825 series router.
It contains the following sections:
•Safety Warnings, page 2
•Safety Guidelines, page 9
•Safety with Electricity, page 9
•Preventing Electrostatic Discharge Damage, page 10
Safety Warnings
Note Use this section in conjunction with the Cisco 2800 Series and Cisco 3800 Series Integrated Services
Routers Regulatory Compliance and Safety Information document:
http://www.cisco.com/en/US/docs/routers/access/2800/hardware/rcsi/2838rcsi.html

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Safety Warnings and Guidelines
Statement 1071—Warning Definition
Warning IMPORTANT SAFETY INSTRUCTIONS
This warning symbol means danger. You are in a situation that could cause bodily injury. Before you
work on any equipment, be aware of the hazards involved with electrical circuitry and be familiar
with standard practices for preventing accidents. Use the statement number provided at the end of
each warning to locate its translation in the translated safety warnings that accompanied this
device.
Statement 1071
SAVE THESE INSTRUCTIONS
Waarschuwing
BELANGRIJKE VEILIGHEIDSINSTRUCTIES
Dit waarschuwingssymbool betekent gevaar. U verkeert in een situatie die lichamelijk letsel kan
veroorzaken. Voordat u aan enige apparatuur gaat werken, dient u zich bewust te zijn van de bij
elektrische schakelingen betrokken risico's en dient u op de hoogte te zijn van de standaard
praktijken om ongelukken te voorkomen. Gebruik het nummer van de verklaring onderaan de
waarschuwing als u een vertaling van de waarschuwing die bij het apparaat wordt geleverd, wilt
raadplegen.
BEWAAR DEZE INSTRUCTIES
Varoitus
TÄRKEITÄ TURVALLISUUSOHJEITA
Tämä varoitusmerkki merkitsee vaaraa. Tilanne voi aiheuttaa ruumiillisia vammoja. Ennen kuin
käsittelet laitteistoa, huomioi sähköpiirien käsittelemiseen liittyvät riskit ja tutustu
onnettomuuksien yleisiin ehkäisytapoihin. Turvallisuusvaroitusten käännökset löytyvät laitteen
mukana toimitettujen käännettyjen turvallisuusvaroitusten joukosta varoitusten lopussa näkyvien
lausuntonumeroiden avulla.
SÄILYTÄ NÄMÄ OHJEET
Attention
IMPORTANTES INFORMATIONS DE SÉCURITÉ
Ce symbole d'avertissement indique un danger. Vous vous trouvez dans une situation pouvant
entraîner des blessures ou des dommages corporels. Avant de travailler sur un équipement, soyez
conscient des dangers liés aux circuits électriques et familiarisez-vous avec les procédures
couramment utilisées pour éviter les accidents. Pour prendre connaissance des traductions des
avertissements figurant dans les consignes de sécurité traduites qui accompagnent cet appareil,
référez-vous au numéro de l'instruction situé à la fin de chaque avertissement.
CONSERVEZ CES INFORMATIONS
Warnung
WICHTIGE SICHERHEITSHINWEISE
Dieses Warnsymbol bedeutet Gefahr. Sie befinden sich in einer Situation, die zu Verletzungen führen
kann. Machen Sie sich vor der Arbeit mit Geräten mit den Gefahren elektrischer Schaltungen und
den üblichen Verfahren zur Vorbeugung vor Unfällen vertraut. Suchen Sie mit der am Ende jeder
Warnung angegebenen Anweisungsnummer nach der jeweiligen Übersetzung in den übersetzten
Sicherheitshinweisen, die zusammen mit diesem Gerät ausgeliefert wurden.
BEWAHREN SIE DIESE HINWEISE GUT AUF.

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Avvertenza
IMPORTANTI ISTRUZIONI SULLA SICUREZZA
Questo simbolo di avvertenza indica un pericolo. La situazione potrebbe causare infortuni alle
persone. Prima di intervenire su qualsiasi apparecchiatura, occorre essere al corrente dei pericoli
relativi ai circuiti elettrici e conoscere le procedure standard per la prevenzione di incidenti.
Utilizzare il numero di istruzione presente alla fine di ciascuna avvertenza per individuare le
traduzioni delle avvertenze riportate in questo documento.
CONSERVARE QUESTE ISTRUZIONI
Advarsel
VIKTIGE SIKKERHETSINSTRUKSJONER
Dette advarselssymbolet betyr fare. Du er i en situasjon som kan føre til skade på person. Før du
begynner å arbeide med noe av utstyret, må du være oppmerksom på farene forbundet med
elektriske kretser, og kjenne til standardprosedyrer for å forhindre ulykker. Bruk nummeret i slutten
av hver advarsel for å finne oversettelsen i de oversatte sikkerhetsadvarslene som fulgte med denne
enheten.
TA VARE PÅ DISSE INSTRUKSJONENE
Aviso
INSTRUÇÕES IMPORTANTES DE SEGURANÇA
Este símbolo de aviso significa perigo. Você está em uma situação que poderá ser causadora de
lesões corporais. Antes de iniciar a utilização de qualquer equipamento, tenha conhecimento dos
perigos envolvidos no manuseio de circuitos elétricos e familiarize-se com as práticas habituais de
prevenção de acidentes. Utilize o número da instrução fornecido ao final de cada aviso para
localizar sua tradução nos avisos de segurança traduzidos que acompanham este dispositivo.
GUARDE ESTAS INSTRUÇÕES
¡Advertencia!
INSTRUCCIONES IMPORTANTES DE SEGURIDAD
Este símbolo de aviso indica peligro. Existe riesgo para su integridad física. Antes de manipular
cualquier equipo, considere los riesgos de la corriente eléctrica y familiarícese con los
procedimientos estándar de prevención de accidentes. Al final de cada advertencia encontrará el
número que le ayudará a encontrar el texto traducido en el apartado de traducciones que acompaña
a este dispositivo.
GUARDE ESTAS INSTRUCCIONES
Varning!
VIKTIGA SÄKERHETSANVISNINGAR
Denna varningssignal signalerar fara. Du befinner dig i en situation som kan leda till personskada.
Innan du utför arbete på någon utrustning måste du vara medveten om farorna med elkretsar och
känna till vanliga förfaranden för att förebygga olyckor. Använd det nummer som finns i slutet av
varje varning för att hitta dess översättning i de översatta säkerhetsvarningar som medföljer denna
anordning.
SPARA DESSA ANVISNINGAR

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Aviso
INSTRUÇÕES IMPORTANTES DE SEGURANÇA
Este símbolo de aviso significa perigo. Você se encontra em uma situação em que há risco de lesões
corporais. Antes de trabalhar com qualquer equipamento, esteja ciente dos riscos que envolvem os
circuitos elétricos e familiarize-se com as práticas padrão de prevenção de acidentes. Use o
número da declaração fornecido ao final de cada aviso para localizar sua tradução nos avisos de
segurança traduzidos que acompanham o dispositivo.
GUARDE ESTAS INSTRUÇÕES
Advarsel
VIGTIGE SIKKERHEDSANVISNINGER
Dette advarselssymbol betyder fare. Du befinder dig i en situation med risiko for
legemesbeskadigelse. Før du begynder arbejde på udstyr, skal du være opmærksom på de
involverede risici, der er ved elektriske kredsløb, og du skal sætte dig ind i standardprocedurer til
undgåelse af ulykker. Brug erklæringsnummeret efter hver advarsel for at finde oversættelsen i de
oversatte advarsler, der fulgte med denne enhed.
GEM DISSE ANVISNINGER

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Safety Warnings and Guidelines
Warning Do not touch the power supply when the power cord is connected. For systems with a power switch,
line voltages are present within the power supply even when the power switch is off and the power
cord is connected. For systems without a power switch, line voltages are present within the power
supply when the power cord is connected. Statement 4
Warning Do not work on the system or connect or disconnect cables during periods of lightning activity.
Statement 1001
Warning Before opening the chassis, disconnect the telephone-network cables to avoid contact with
telephone-network voltages. Statement 1041
Warning Network hazardous voltages are present in the BRI cable. If you detach the BRI cable, detach the end
away from the router first to avoid possible electric shock. Network hazardous voltages also are
present on the system card in the area of the BRI port (RJ-45 connector), regardless of when power is
turned off. Statement 44
Warning Before working on a chassis or working near power supplies, unplug the power cord on AC units;
disconnect the power at the circuit breaker on DC units. Statement 12
Warning When installing the unit, always make the ground connection first and disconnect it last. Statement 42

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Safety Warnings and Guidelines
Warning Before working on equipment that is connected to power lines, remove jewelry (including rings,
necklaces, and watches). Metal objects will heat up when connected to power and ground and can
cause serious burns or weld the metal object to the terminals. Statement 43
Warning Do not touch the power supply when the power cord is connected. For systems with a power switch,
line voltages are present within the power supply even when the power switch is off and the power
cord is connected. For systems without a power switch, line voltages are present within the power
supply when the power cord is connected. Statement 4
Warning Before performing any of the following procedures, ensure that power is removed from the DC circuit.
Statement 1003
Safety Guidelines
Follow these guidelines to ensure general safety:
•Keep the chassis area clear and dust-free during and after installation.
•Place the removed chassis cover in a safe place.
•Keep tools away from walk areas where you or others could fall over them.
•Do not wear loose clothing that may get caught in the chassis. Fasten your tie or scarf and roll up
your sleeves.
•Wear safety glasses when working under conditions that may be hazardous to your eyes.
•Do not perform any action that creates a potential hazard to people or makes the equipment unsafe.
Safety with Electricity
Warning Before working on equipment that is connected to power lines, remove jewelry (including rings,
necklaces, and watches). Metal objects will heat up when connected to power and ground and can
cause serious burns or weld the metal object to the terminals. Statement 43
Follow these guidelines when working on equipment powered by electricity:
•Locate the room’s emergency power-off switch. Then, if an electrical accident occurs, you can
quickly shut the power off.
•Before working on the system, turn off the power and unplug the power cord.
•Disconnect all power.
•Do not work alone if potentially hazardous conditions exist.
•Look carefully for possible hazards in your work area, such as moist floors, ungrounded power
extension cables, and missing safety grounds.
•Never assume that power is disconnected from a circuit. Always check.

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Items in the Fan Replacement Kit
•If an electrical accident occurs, proceed as follows:
– Use caution, and do not become a victim yourself.
– Turn off power to the system.
– If possible, send another person to get medical aid. Otherwise, determine the condition of the
victim and then call for help.
Preventing Electrostatic Discharge Damage
Electrostatic discharge (ESD) can damage equipment and impair electrical circuitry. It occurs when
electronic printed circuit cards are improperly handled and can result in complete or intermittent
failures. Always follow ESD-prevention procedures when removing and replacing cards. Ensure that the
router chassis is electrically connected to earth ground. Wear an ESD-preventive wrist strap, ensuring
that it makes good skin contact. Connect the clip to an unpainted surface of the chassis frame to safely
channel unwanted ESD voltages to ground. To properly guard against ESD damage and shocks, the wrist
strap and cord must operate effectively. If no wrist strap is available, ground yourself by touching the
metal part of the chassis.
Caution For safety, periodically check the resistance value of the antistatic strap, which should be between 1 and
10 megohms (Mohms).
Items in the Fan Replacement Kit
The fan replacement kit contains the following items:
•Fan unit (three fans connected together as one unit)
•Additional replacement screws (a few extra screws are provided in case you misplace the original
screws)
•Installing and Upgrading Fans in the Cisco 3825 Series Routers document (this document)
Required Tools and Equipment
Installation might require some tools and equipment that are not provided as standard equipment with
the router. The following tools and parts are required for a typical router installation:
•Number 2 Phillips screwdriver
•ESD-preventive wrist strap
•Antistatic mat

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Location of the Cisco 3825 Router Fans
Location of the Cisco 3825 Router Fans
Figure 1 shows the location of the fan unit in the Cisco 3825 router. The Cisco 3825 routers contain three
fans, which are connected together as one unit.
Figure 1 Fan Unit Location in the Cisco 3825 Router
1Location of the fan unit
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1

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Upgrading the Cisco 3825 Fan Unit
Upgrading the Cisco 3825 Fan Unit
The fan unit and cabling for the Cisco 3825 router are contained inside the chassis.
Note The fan unit upgrade procedure will take approximately one hour.
To upgrade the fan unit, complete these procedures:
•Removing the Router Cover, page 12
•Removing the Fan Unit, page 14
•Installing the Fan Unit, page 16
•Replacing the Router Cover, page 18
Removing the Router Cover
To access the Cisco 3825 fan unit, you must first remove the router cover. To remove the router cover,
complete the steps that follow. You will need a number 2 Phillips screwdriver.
If your router uses AC or DC power, observe the following warning:
Warning Do not touch the power supply when the power cord is connected. For systems with a power switch,
line voltages are present within the power supply even when the power switch is off and the power
cord is connected. For systems without a power switch, line voltages are present within the power
supply when the power cord is connected. Statement 4
If your router uses DC power, observe the following warning:
Warning Before performing any of the following procedures, ensure that power is removed from the DC circuit.
Statement 1003
Caution Before removing the cover, make sure that the flash memory card ejector button is flush with the front
panel. If the button projects from the panel, removing the cover can damage it.
Step 1 Power down the router and disconnect the power cord from the front of the router.
Warning Before opening the unit, disconnect the telephone-network cables to avoid contact with
telephone-network voltages. Statement 1041
Step 2 Disconnect all network interface cables from the back panel of the router.
Step 3 Remove the router from the rack. Remove the rack-mounting brackets from the router, using the number
2 Phillips screwdriver.
Step 4 Place the router on a flat surface. Remove the two screws from the top of the router and set them aside
in a safe place.

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Upgrading the Cisco 3825 Fan Unit
Step 5 Remove the three screws on each side panel and set them aside in a safe place.
Step 6 Slide the cover toward the front of the chassis (about 1 inch [25 mm]), as shown in Figure 2.
Figure 2 Removing the Cover from a Cisco 3825 Router
Step 7 Lift the cover away from the router chassis, as shown in Figure 2.
Step 8 Set the cover aside.
1Slide cover toward front 2Remove cover from router chassis
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35x17x34x16x33x15x32x14x31x13x30x12x
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Upgrading the Cisco 3825 Fan Unit
Removing the Fan Unit
After you remove the router cover, follow these steps to remove the fan unit.
Note Before you begin, read the safety warnings as described in the “Safety Warnings and Guidelines” section
on page 2.
Step 1 Locate the three fan connectors on the motherboard and remove them by lifting the connector away from
the receptacle, as shown in Figure 3.
Figure 3 Lifting the Connector from the Receptacle
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Upgrading the Cisco 3825 Fan Unit
Step 2 Remove the two screws that hold the top of the fan unit to the router. (See Figure 4.)
Figure 4 Removing Screws Holding the Top of the Fan Unit
Step 3 Remove the four screws that hold the fan unit to the side of the chassis. (See Figure 5.)
Figure 5 Removing Fan Mounting Screws from the Side of the Chassis
1Screws holding the top of the fan unit to the router
280477
1
1Fan mounting screws on the side of the
chassis
1
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Upgrading the Cisco 3825 Fan Unit
Step 4 Remove the two screws that hold the fan unit to the front of the chassis. (See Figure 6.)
Figure 6 Removing Fan Mounting Screws from the Front of the Chassis
Step 5 Lift the fan unit out of the chassis.
Installing the Fan Unit
Follow these steps to install the fan unit.
Note Before you begin, read the safety warnings as described in the “Safety Warnings and Guidelines” section
on page 2.
1Fan mounting screws on the front of the
chassis
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Upgrading the Cisco 3825 Fan Unit
Step 1 Lower the fan unit down and onto the chassis floor.
Step 2 Attach fan 1 to the J4 connector on the motherboard. (See number 1 and 2 in Figure 7.)
Figure 7 Attaching Fan Cable to the J Connectors
Step 3 Attach fan 2 to the J18 connector on the motherboard. (See number 3 and 4 in Figure 7.)
Step 4 Attach fan 3 to the J25 connector on the motherboard. (See number 5 and 6 in Figure 7.)
Caution Orient the fan connectors correctly before you insert them. Incorrect orientation can damage the
connector pins.
Step 5 Reinstall the two screws on the front of the chassis. (See Figure 6 on page 16.)
Step 6 Reinstall the four screws on the side of the chassis. (See Figure 5 on page 15.)
Step 7 Reinstall the two screws on the top of the fan unit. (See Figure 4 on page 15.)
1Fan 1 2Fan 1 to J4 connector
3Fan 2 4Fan 2 to J18 connector
5Fan 3 6Fan 3 to J25 connector
1 2 4365
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Obtaining Documentation, Obtaining Support, and Security Guidelines
Replacing the Router Cover
Follow these steps to replace the cover.
Note Before you begin, read the safety warnings as described in the “Safety Warnings and Guidelines” section
on page 2.
Step 1 Place the router on a flat surface, with the front panel facing you.
Step 2 Place the cover on the base, with about 1 inch (25 mm) of clearance between the cover and the back
panel.
Step 3 Slide the cover back onto the base, making sure that the hook at the back edge of the cover, near the left
side, fits underneath the card cage on the back panel of the router.
Caution When replacing the cover, do not pinch the wires.
Step 4 Reinstall the rack-mounting brackets, and then reinstall the router in the rack.
Step 5 Reconnect power and network interface cables.
Step 6 Power up the router, and verify that the alarms and warnings disappear.
Obtaining Documentation, Obtaining Support, and Security
Guidelines
For information on obtaining documentation, obtaining support, providing documentation feedback,
security guidelines, and also recommended aliases and general Cisco documents, see the monthly
What’s New in Cisco Product Documentation, which also lists all new and revised Cisco technical
documentation, at:
http://www.cisco.com/en/US/docs/general/whatsnew/whatsnew.html

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Obtaining Documentation, Obtaining Support, and Security Guidelines
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