Table Of Contents
Installing and Upgrading Fans in the Cisco 2821 and Cisco 2851 Series Routers
Safety Warnings and Guidelines
Safety Warnings
Statement 1071—Warning Definition
Safety Guidelines
Safety with Electricity
Preventing Electrostatic Discharge Damage
Items in the Fan Replacement Kit
Required Tools and Equipment
Location of the Cisco 2821 and Cisco 2851 Router Fans
Upgrading the Cisco 2821 and Cisco 2851 Fan Unit
Removing the Router Cover
Removing the Fan Unit
Installing the Fan Unit
Replacing the Router Cover
Obtaining Documentation, Obtaining Support, and Security Guidelines
Installing and Upgrading Fans in the Cisco 2821 and Cisco 2851 Series Routers
This document describes how to install or upgrade fans inside your Cisco 2821 and Cisco 2851 series routers.
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 2800 Series Hardware Installation guide:
http://www.cisco.com/en/US/docs/routers/access/2800/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.
This document contains the following sections:
•Safety Warnings and Guidelines
•Items in the Fan Replacement Kit
•Required Tools and Equipment
•Location of the Cisco 2821 and Cisco 2851 Router Fans
•Upgrading the Cisco 2821 and Cisco 2851 Fan Unit
•Obtaining Documentation, Obtaining Support, and Security Guidelines.
Safety Warnings and Guidelines
This section provides the safety warnings and guidelines for working with the Cisco 2821 and Cisco 2851 series routers. It contains the following sections:
•Safety Warnings
•Safety Guidelines
•Safety with Electricity
•Preventing Electrostatic Discharge Damage
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
Statement 1071—Warning Definition
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Warning
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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
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Waarschuwing
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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
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Varoitus
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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
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Attention
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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
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Warnung
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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
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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
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Advarsel
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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
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Aviso
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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
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¡Advertencia!
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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
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Varning!
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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
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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
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Advarsel
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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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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
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.
•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 2821 and Cisco 2851 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
Location of the Cisco 2821 and Cisco 2851 Router Fans
Figure 1 shows the location of the fan unit in the Cisco 2821 and Cisco 2851 routers. The router contains three fans, which are connected together as one unit.
Figure 1 Fan Unit Location in the Cisco 2821 and Cisco 2851 Routers
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Location of the fan unit
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Upgrading the Cisco 2821 and Cisco 2851 Fan Unit
The fan unit and cabling for the Cisco 2821 and Cisco 2851 routers 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
•Removing the Fan Unit
•Installing the Fan Unit
•Replacing the Router Cover
Removing the Router Cover
To access the Cisco 2821 or Cisco 2851 fan unit, you must first remove the bezel and then remove the router cover. The bezel is the front plastic panel on the chassis, which has the Cisco logo, LEDs, ports, and input power connection.
To remove the bezel and 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
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 Place the router on a flat surface.
Step 4 Remove the bezel from the front of the router. Follow these steps.
Caution Before removing the bezel, make sure that the flash memory card ejector button is flush with the bezel. If the button projects from the bezel, removing the bezel can damage it.
a. Grasp the bezel at the upward-facing arrow located at the top and center of the front bezel. (See Figure 2.)
Figure 2 Location of the Arrow on the Bezel
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b. Pull the top of the bezel 1/8 to 1/4 inch (3 to 8 mm) away from the chassis. (See number 1 in Figure 3.)
Figure 3 Removing the Bezel
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Pull top of bezel away from chassis
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Slide bezel to release it from chassis
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c. While holding the bezel away from the chassis, slide it toward the left side (input power side) until it comes off the chassis, as shown in Figure 3. (See number 2 in Figure 3.)
Step 5 Remove the router cover. Follow these steps:
a. Use a number 2 Phillips screwdriver to remove the three screws at the back of the top cover. Set the screws aside in a safe place.
b. Lift the cover up at a 45-degree angle, as shown in Figure 4.
Figure 4 Removing the Cover from a Cisco 2821 or Cisco 2851 Router
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Lift cover
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Slide cover to free the tabs
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c. Slide the cover to the side (toward the side with the fans) until the tabs are free from the slots, as shown in Figure 4.
d. Lift the cover away from the router chassis, and set the cover aside.
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.
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 5.
Figure 5 Lifting the Connector from the Receptacle
Step 2 Remove the three screws that hold the fan unit to the side of the chassis. (See number 1 in Figure 6.)
Figure 6 Removing Fan Mounting Screws from the Chassis
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Fan mounting screws on the side of the chassis
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2
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Fan mounting screw on the front of the chassis
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Step 3 Remove the one screw that holds the fan unit to the front of the chassis. (See number 2 in Figure 6.)
Step 4 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.
Step 1 Lower the fan unit down and onto the chassis floor.
Step 2 Attach fan 1 to the J9 connector on the motherboard. (See number 1 and 2 in Figure 7.)
Step 3 Attach fan 2 to the J8 connector on the motherboard. (See number 3 and 4 in Figure 7.)
Step 4 Attach fan 3 to the J7 connector on the motherboard. (See number 5 and 6 in Figure 7.)
Caution The connectors are polarized/keyed to allow easy insertion in one orientation only. Orient the fan connectors correctly before you insert them. Incorrect orientation can damage the connector pins.
Figure 7 Attaching Fan Cable to the J Connectors
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Fan 1
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Fan 1 to J9 connector
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Fan 2
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4
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Fan 2 to J8 connector
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5
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Fan 3
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6
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Fan 3 to J7 connector
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Step 5 Reinstall the one screw on the front of the chassis. (See number 2 in Figure 6.)
Step 6 Reinstall the three screws on the side of the chassis. (See number 1 in Figure 6.)
Replacing the Router Cover
Note Before you begin, read the safety warnings as described in the "Safety Warnings and Guidelines" section.
To replace the chassis cover on a Cisco 2821 or Cisco 2851 router, follow these steps. You need a number 2 Phillips screwdriver.
Step 1 Place the chassis on a flat surface.
Step 2 Hold the cover at a 45-degree angle, and insert the tabs into the slots along the front (bezel) edge of the chassis, as shown in Figure 8.
Figure 8 Installing the Cover on the Cisco 2821 or Cisco 2851 Routers
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Insert tabs and center the cover
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Close the cover
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Step 3 Center the cover over the chassis and lower it onto the chassis, as shown in Figure 8.
Step 4 Reinstall the three cover screws.
Caution When replacing the cover, do not pinch the wires.
Step 5 Replace the bezel by sliding it into the front of the chassis. Make sure the upward-facing arrow on the bezel is at the top and center of the chassis, as shown in Figure 2.
Step 6 Reconnect power and network interface cables.
Step 7 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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