Table Of Contents
Installing and Upgrading Fans in Cisco 3725 Series Routers
Safety Recommendations
Safety with Electricity
Preventing Electrostatic Discharge Damage
Statement 1071—Warning Definition
Required Tools and Equipment
Overview of Cisco 3725 Router Fans
Removing the Chassis Cover
Replacing the Cisco 3725 System Fan
Removing the Router Cover
Removing the Cisco 3725 System Fan
Installing the Cisco 3725 System Fan
Replacing the Router Cover
Obtaining Documentation, Obtaining Support, and Security Guidelines
Installing and Upgrading Fans in Cisco 3725 Series Routers
This document describes how to install or upgrade fans that are located inside your Cisco 3725 series router. You must remove the cover from the router before you can install or remove the fans.
This document is intended for the fan installer, who should be familiar with electronic circuitry and wiring practices and have experience as an electronic or electromechanical technician.
Note 
Use this document in conjunction with the Cisco 3700 Series Hardware Installation Guide and the Regulatory Compliance and Safety Information document for your router. You can find these documents at the following URLs.
For the Cisco 3700 Series Hardware Installation Guide:
http://www.cisco.com/en/US/docs/routers/access/3700/hardware/installation/guide/37higbk.pdf
For the Regulatory Compliance and Safety Information document:
http://www.cisco.com/en/US/products/hw/routers/ps259/products_regulatory_approvals_and_compliance09186a008007e46e.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 Recommendations
•Required Tools and Equipment
•Overview of Cisco 3725 Router Fans
•Removing the Chassis Cover
•Replacing the Cisco 3725 System Fan
•Obtaining Documentation, Obtaining Support, and Security Guidelines
Before you replace the fan, disconnect the power and remove the cover, as described in the "Removing the Chassis Cover" section. After you replace the fan, install the chassis cover as described in the "Replacing the Cisco 3725 System Fan" section.
Safety Recommendations
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.
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.
–Determine if the person needs rescue breathing or external cardiac compressions; then take appropriate action.
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).
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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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
Overview of Cisco 3725 Router Fans
Figure 1 shows the location of the system fan in the Cisco 3725 router.
Figure 1 System Fan Location in the Cisco 3725 Router
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Cisco 3725 router fan A
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Cisco 3725 router fan B
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Removing the Chassis Cover
To access the system fans on the Cisco 3725 router, remove the router cover as described in the "Removing the Router Cover" section.
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.
Warning Do not work on the system or connect or disconnect cables during periods of lightning activity.
Warning Before opening the chassis, disconnect the telephone-network cables to avoid contact with telephone-network voltages.
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.
Replacing the Cisco 3725 System Fan
The system fan and cabling for the Cisco 3725 router are contained inside the chassis. To replace the system fan, complete these procedures:
•Removing the Router Cover
•Removing the Cisco 3725 System Fan
•Installing the Cisco 3725 System Fan
•Replacing the Router Cover
•Obtaining Documentation, Obtaining Support, and Security Guidelines
Removing the Router Cover
To access the Cisco 3725 system fan, you must first remove the chassis cover. Follow these steps:
Step 1 Turn off power to the router.
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.
Step 2 Remove all network interface cables from the back panel.
Step 3 Remove the power cord.
Warning When installing the unit, always make the ground connection first and disconnect it last.
Step 4 Place the router so that the back panel is closest to you. Remove the six screws on the top of the cover. Set the screws aside in a safe place.
Step 5 Lift the front edge of the cover. (See number 1 in Figure 2.)
Step 6 Slide the cover toward the right until the metal tabs on the back edge separate from the chassis bottom. (See number 2 in Figure 2.)
Figure 2 Removing the Cisco 3725 Router Cover
Step 7 Lift the cover off completely and set it aside.
When you are ready to replace the cover, see the "Replacing the Router Cover" section.
Removing the Cisco 3725 System Fan
After you remove the cover from the chassis, follow these steps to remove the system fan:
Step 1 Locate the two fan connectors on the motherboard and remove them. (See Figure 3.)
Note On a Cisco 3725 router, you can simply lift the connector away from the receptacle. (See Figure 3.)
Figure 3 Removing Cisco 3725 Fan Power Connectors
Step 2 The Cisco 3725 fans are each secured to the chassis by two external mounting screws at the side of the router. (See Figure 4.) Remove the screws and set them aside.
Figure 4 Removing Cisco 3725 Fan Mounting Screws
Step 3 Lift fan A, at an angle, up and out of the chassis. (See Figure 5.)
Figure 5 Removing Fan A from the Cisco 3725 Router
Step 4 Slide fan B to the right. Then lift the fan, at an angle, up and out of the chassis. (See Figure 6.)
Figure 6 Removing Fan B from the Cisco 3725 Router
Installing the Cisco 3725 System Fan
Figure 7 shows the correct orientation of the chassis and the correct airflow direction when the Cisco 3725 router fans are properly installed. Fans need to be placed so that they are exhausting air out of the chassis. Figure 8 shows the fan airflow direction when installing the fan.
Figure 7 Correct Chassis Orientation in the Cisco 3725 Router
Figure 8 Correct Fan Orientation in the Cisco 3725 Router
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Arrow indicating fan installation direction
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Arrow indicating fan rotation direction
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Follow these steps to install the system fan:
Step 1 Lower fan B down and onto the chassis floor. Slide the fan to the left until it fits snugly in the fan receptacle. (See Figure 9.)
Caution Make sure the arrow on top of the fan, indicating fan installation direction (see
Figure 8), is pointing out from the chassis.
Figure 9 Installing Fan B in the Cisco 3725 Router
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Location of the fan B wire
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Step 2 Lower fan A, at an angle, down and onto the chassis floor. (See Figure 10.)
Caution Make sure the arrow on top of the fan, indicating fan installation direction (see
Figure 8), is pointing out from the chassis.
Figure 10 Installing Fan A in the Cisco 3725 Router
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Location of the fan A wire
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Step 3 Twist the fan cables together to avoid any excess loop. (See Figure 11.)
Figure 11 Removing Excess Loop in the Fan Cables
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Twist wires to remove excess loop
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Step 4 Attach fan A to the J15 connector on the motherboard. (See Figure 12.)
Caution Make sure the fan connectors are correctly oriented prior to insertion. Incorrect orientation can result in damaging the connector pins.
Step 5 Attach fan B to the J16 connector on the motherboard. (See Figure 12.)
Figure 12 Attaching Fan Cable to the J Connectors
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Fan A connector wire
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Fan A to J15 connector
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Fan B connector wire
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Fan B to J16 connector
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Step 6 Replace the external mounting screws at the side of the router. (See Figure 4.)
Replacing the Router Cover
Follow these steps to replace the cover:
Step 1 Place the chassis bottom so that the front panel is closest to you.
Step 2 Hold the cover so that the tabs at the back of the cover are aligned with the chassis bottom.
Step 3 Push the cover toward the back, making sure that the cover tabs fit under the chassis back panel, and the back panel tabs fit under the cover.
Step 4 Slide the cover slightly to the right to lock the cover into position (number 1 in Figure 13).
Figure 13 Replacing the Cisco 3725 Router Cover
Step 5 Lower the front of the cover onto the chassis.
Step 6 Fasten the cover with the five screws you set aside.
Step 7 Reinstall the chassis on a rack.
Step 8 Reinstall the network interface cables.
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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