Cisco Nexus 7000 Series Guide

1
Doc. No.
Copyright © 1995
Cisco Systems, Inc.
All rights reserved.
Cisco 7000 and Cisco 7507
Air Filter and Chassis Blower
Replacement Instructions
78-1059-04
Product Numbers: MAS-7KFAN and ACS-7KFILTER
Customer Order Number: DOC-781059=
This document contains instructions for replacing the air filter and the chassis blower in the
Cisco 7000 and Cisco 7507.
Note The air filter and chassis blower installation and functionality are identical for both chassis;
therefore, throughout this document, both chassis are referred to as the chassis, with differences
clearly noted.
The air filter, which is integrated with the top front chassis panel, should be kept clean by periodic
vacuuming, and should be replaced if it becomes torn, worn, or dirty. You can access the filter while
the system is operating by removing the bottom front chassis panel. The blower, which is located in
the front interior of the chassis, need only be replaced if the existing blower fails. You must turn all
system power off and remove the top and bottom front chassis panels to access the blower.
The sections in this document include the following:
•Product Overview, page 2
•Prerequisites, page 4
•Removing and Replacing the Front Chassis Panels, page 6
•Cleaning and Replacing the Air Filter, page 10
•Replacing the Chassis Blower, page 11

2Cisco 7000 and Cisco 7507 Air Filter and Chassis Blower Replacement Instructions
Product Overview
Product Overview
This section provides brief physical and functional descriptions of the chassis blower and air filter.
shows the front of the chassis with the top and bottom front panels removed to show the internal
components.Internal Chassis Front View
The system blower provides cooling air for the chassis internal components. The blower is located
on the bottom left of the chassis interior when viewed in the orientation shown in . The blower draws
air in through the air filter (which is not shown in ) and directs it up through the floor of the internal
card cage and over the processor modules. The exhaust air is forced out the rear of the chassis above
and to each side of the internal slot compartment. The airflow path is shown in Figure 1. The air dam
shown in Figure 1 keeps the chassis blower air separate from the air drawn in by the power supply
fans. A cable (purple +24V wire and black ground wire) with a keyed three-prong plug connects the
blower to the backplane power bus to deliver power from the power supplies. (See the blower power
connection in .)
Two air ducts on the rear of the blower, shown shaded in Figure 1, fit snugly into the two cutouts in
the backplane. The blower is secured to the backplane with three large captive Phillips or Allen-head
screws. (The earliest chassis manufactured use Phillips screws; the rest now use Allen-head screws.)
H3898
LED board
(mounted on horizontal
plane in chassis)
LED board spring
LEDs
Blower air ducts to
interface processor
compartment
Blower connection

Cisco 7000 and Cisco 7507 Air Filter and Chassis Blower Replacement Instructions 3
Product Overview
Figure 1 Internal Air Flow, Top-Down View of Chassis
Caution Operate the system only if the blower is installed and functioning properly. The blower
prevents an overtemperature condition that can result in severe equipment damage.
The air filter fits into the lower frame of the top front chassis panel. (See Figure 2.) Maintaining a
consistent air filter cleaning schedule helps to maintain normal system operation. A dirty filter can
prohibit the flow of cooling air into the chassis and may cause an overtemperature condition.
Figure 2 Chassis Air Filter and Top Front Panel
H1338a
Power
supplies
Front of
chassis Rear of
chassis
Air dam
Slot
01234SP
or
SSP
RP
Air dam
System blower
Air duct
Air duct
UPPER
POWER LOWER
POWER NORMAL
Cisco 7000
H1336a
Captive screws
FrameFilter
(gray)

4Cisco 7000 and Cisco 7507 Air Filter and Chassis Blower Replacement Instructions
Prerequisites
Prerequisites Before you begin this installation, review the safety guidelines in this section to avoid injuring
yourself or damaging the equipment.
Warning 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.
Waarschuwing 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
standaard maatregelen om ongelukken te voorkomen.
Varoitus Tämävaroitusmerkkimerkitseevaaraa.Olettilanteessa,joka voijohtaa ruumiinvammaan.
Ennen kuin työskentelet minkään laitteiston parissa, ota selvää sähkökytkentöihin liittyvistä
vaaroista ja tavanomaisista onnettomuuksien ehkäisykeinoista.
Attention Ce symbole d'avertissement indique un danger. Vous vous trouvez dans une situation
pouvant causer des blessures ou des dommages corporels. Avant de travailler sur un équipement,
soyez conscient des dangers posés par les circuits électriques et familiarisez-vous avec les
procédures couramment utilisées pour éviter les accidents.
Warnung Dieses Warnsymbol bedeutet Gefahr. Sie befinden sich in einer Situation, die zu einer
Körperverletzung führen könnte. Bevor Sie mit der Arbeit an irgendeinem Gerät beginnen, seien Sie
sich der mit elektrischen Stromkreisen verbundenen Gefahren und der Standardpraktiken zur
Vermeidung von Unfällen bewußt.
Avvertenza Questo simbolo di avvertenza indica un pericolo. La situazione potrebbe causare
infortuni alle persone. Prima di lavorare su qualsiasi apparecchiatura, occorre conoscere i pericoli
relativiaicircuitielettrici edessere alcorrente delle pratiche standard perla prevenzionedi incidenti.
Advarsel Dette varselsymbolet betyr fare. Du befinner deg i en situasjon som kan føre til
personskade. Før du utfører arbeid på utstyr, må du vare oppmerksom på de faremomentene som
elektriske kretser innebærer, samt gjøre deg kjent med vanlig praksis når det gjelder å unngå ulykker.
Aviso Este símbolo de aviso indica perigo. Encontra-se numa situação que lhe poderá causar danos
físicos. Antes de começar a trabalhar com qualquer equipamento, familiarize-se com os perigos
relacionados com circuitos eléctricos, e com quaisquer práticas comuns que possam prevenir
possíveis acidentes.
¡Advertencia! Este símbolo de aviso significa peligro. Existe riesgo para su integridad física.
Antes de manipular cualquier equipo, considerar los riesgos que entraña la corriente eléctrica y
familiarizarse con los procedimientos estándar de prevención de accidentes.
Varning! Denna varningssymbol 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 vanligt förfarande för att förebygga skador.

Cisco 7000 and Cisco 7507 Air Filter and Chassis Blower Replacement Instructions 5
Prerequisites
Safety Guidelines
The following guidelines will help to ensure your safety and protect the equipment. This list is not
inclusive of all potentially hazardous situations, so be alert.
•You can remove the bottom front chassis panel and replace the air filter while the system is
operating, but you must turn all power supplies off and disconnect power cords before removing
the top front chassis panel to access the chassis interior. Dangerous current levels are present on
the backplane when power is on.
•Do not work alone when potentially hazardous conditions exist.
•Carefully examine your work area for possible hazards such as moist floors, ungrounded power
extension cables, and missing safety grounds.
•Before beginning any procedures requiring access to the chassis interior, locate the emergency
power-off switch for the room in which you are working.
•Never assume that power has been disconnected from a circuit; always check.
In addition, use the following guidelines when working with any equipment that is connected to
telephone wiring or other network cabling.
•Never install telephone wiring during a lightning storm.
Warning Do not work on the system or connect or disconnect cables during periods of lightning
activity. (For translations of this safety warning, refer to the section “Lightning Activity Warning on
page 15.)
•Never install telephone jacks in wet locations unless the jack is specifically designed for wet
locations.
•Never touch uninsulated telephone wires or terminals unless the telephone line has been
disconnected at the network interface.
•Use caution when installing or modifying telephone lines.
Warning Before opening the chassis, disconnect the telephone-network cables to avoid contact
with telephone-network voltages. (For translations of this safety warning, refer to the section
“Chassis Warning—Disconnecting Telephone-Network Cables on page 15.)
List of Parts and Tools
You need the following tools to clean or replace the air filter, and to replace the blower:
•To clean the air filter, you need a small hand vacuum.
•To removeand washthefilter,orto replace it with anewfilter,you mightneed asmall (3/16-inch)
flat-blade screwdriver to push the edges of the filter back into the frame of the top front panel.
•To replace the system blower, you need the following tools:
—To remove the top front chassis panel, you need a medium (Number 2 Phillips or 3/16-inch
flat-blade) screwdriver. Earlier chassis (the first several hundred shipped) used slotted
screws, and later chassis used Phillips screws to secure the top front panel to the chassis. No
tools are required to remove the bottom front chassis panel.

6Cisco 7000 and Cisco 7507 Air Filter and Chassis Blower Replacement Instructions
Removing and Replacing the Front Chassis Panels
—To loosen the captive screws on the blower, you need a long (9 inches or longer) Number 2
Phillips screwdriver or a long (9 inches or longer) 3-mm center-hex Allen wrench. (The first
few hundred systems shipped used Phillips screws; all subsequent chassis used Allen-head
screws.) A 3-mm Allen-head T-handle driver is shipped with all spare blowers.
Before beginning the replacement procedure, check the blower to determine which tools you will
need.
Removing and Replacing the Front Chassis Panels
To access the air filter, youmust remove the bottom front chassis panel. To access the chassis interior
to replace the blower, you must remove the top and bottom front chassis panels. Carefully follow
the instructions for removing and replacing the top front panel because you can damage or destroy
the LED board or top front panel by forcing a misaligned panel onto or off of the chassis body.
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. (For translations of this safety
warning, refer to the section “Power Supply Disconnection Warning” on page 16.)
Warning This unit might have more than one power cord. To reduce the risk of electric shock,
disconnect the two power supply cords before servicing the unit. (For translations of this safety
warning, refer to the section “Electric Shock Warning” on page 17.)
Note The following warning is for units equipped with a DC-input power supply.
Warning Before performing any of the following procedures, ensure that power is removed from
the DC circuit. To ensure that all power is OFF, locate the circuit breaker on the panel board that
services the DC circuit, switch the circuit breaker to the OFF position, and tape the switch handle of
the circuit breaker in the OFF position. (For translations of this safety warning, refer to the section
“DC Power Disconnection Warning” on page 17.)
Removing the Panels
You must remove the bottom front panel before you can remove the top front panel. The plastic
bottom front panel is attached to the chassis with ball studs. The top front panel is attached to the
chassis with two captive screws. The EMI shielding around the outer edge of the top front panel acts
as a spring and compresses when you push the panel into the chassis to keep the panel fitted tightly
into the chassis opening. To remove the front panels, perform the following steps:
Step 1 Grasp the bottom edge of the bottom chassis panel.
Step 2 Pull the bottom of the panel out about one inch, then place your fingers behind the sides of
the panel and pull it off the chassis. (See Figure 3, on page 7.)
Step 3 On the top front panel, use a screwdriver to loosen the two captive screws at the bottom
edge of the panel frame.

Cisco 7000 and Cisco 7507 Air Filter and Chassis Blower Replacement Instructions 7
Removing and Replacing the Front Chassis Panels
Figure 3 Removing the Bottom Front Panel
Step 4 Place one hand against the top front center of the panel to brace it. (See Figure 4a.) The top
of the panel acts as a pivot point when you pull the bottom out and away from the chassis.
Figure 4 Removing the Top Front Panel
UPPER
POWER LOWER
POWER NORMAL
Cisco 7000
H1335a
Cisco 7000
UPPER
POWER LOWER
POWER NORMAL
Cisco 7000
UPPER
POWER LOWER
POWER NORMAL
H1459a
ab

8Cisco 7000 and Cisco 7507 Air Filter and Chassis Blower Replacement Instructions
Removing and Replacing the Front Chassis Panels
Step 5 With your other hand, grasp the front of the panel by inserting your fingers into the opening
on the underside of the bezel. (See Figure 4a.)
Step 6 While pushing slightly against the top of the panel to constrain it, pivot the bottom edge of
the frame outward about two inches. (See Figure 4a.) Because of the tightly compressed
EMI shielding, you will have to use significant force to pull the bottom of the panel
outward. However, be careful that you do not pull the panel more than two inches away
from the chassis, or you can damage the inner bezel or LED board.
Step 7 When the bottom of the frame clears the chassis opening, keep your hands in the same
positions and pull the panel downward and off the chassis. (See Figure 4b.)
Replacing the Panels
To replace the front panels, perform the following steps:
Step 1 Grasp the sides of the top panel with both hands. (See Figure 5a.)
Step 2 Two guide tabs at the top edges of the panel fit into two slots in the top edges of the chassis
opening. Tilt the top of the panel back (away from you) about 30 degrees from vertical and
slide the two guide tabs into the chassis slots. (See Figure 5a.)
Step 3 Check the top of the panel and make sure it is lined up with the top of the chassis opening.
Failure to align the panel at this point can result in equipment damage when performing the
next step.
Step 4 Push the panel upward to push the tabs into the slots. (see Figure 5a) and pivot the bottom
of the panel toward the chassis until the panel frame meets the chassis. (See Figure 5b.)
Maintain a steady upward pressure to keep the guide tabs in the chassis slots.
Step 5 When the panel is flush against the front of the chassis, push the panel upward until the
bottom of the panel is level with the bottom of the chassis opening. (See Figure 5c.)
Step 6 While holding the panel in place, place one palm against the top front center of the panel
to brace it, and place the other against the lip near the bottom edge of the frame. (See
Figure 5d.)
Step 7 Push the panel upward and back into the chassis opening until the tabs on the front sides of
the panel are flush against the front of the chassis. (See Figure 5d.) You will have to use
significant force to compress the EMI shielding enough to fit into the opening. If the panel
resists, pull it slightly downward and make sure that the panel is lined up with the top and
sides of the opening in the chassis.
Step 8 When the tabs on the front sides of the panel are flush against the sides of the chassis,
tighten the two captive screws in the bottom edge of the frame.
Step 9 To replace the bottom front panel, place the ball studs on the back of the panel over the
holes in the front lip of the chassis and push the panel onto the chassis until the ball studs
snap into place.
This completes the chassis front panel removal and replacement procedures.

Cisco 7000 and Cisco 7507 Air Filter and Chassis Blower Replacement Instructions 9
Removing and Replacing the Front Chassis Panels
Figure 5 Replacing the Top Front Panel
Cisco 7000
UPPER
POWER LOWER
POWER NORMAL
Cisco 7000
UPPER
POWER LOWER
POWER NORMAL
Cisco 7000
UPPER
POWER LOWER
POWER NORMAL
H1460a
UPPER
POWER LOWER
POWER NORMAL
Cisc
Cisc
Guide tab slides up into
slot in chassis
a
bc
d
Cisco 7000
UPPER
POWER LOWER
POWER NORMAL
e

10 Cisco 7000 and Cisco 7507 Air Filter and Chassis Blower Replacement Instructions
Cleaning and Replacing the Air Filter
Cleaning and Replacing the Air Filter
The air filter removes dust from the air drawn in by the blower. The edges of the air filter fit into the
lower frame of the top front chassis panel. (See Figure 2.) Remove and vacuum the air filter at least
once every two weeks (more often in unusually dusty environments). You can also wash the filter in
running water, but ensure that it is completely dry before replacing it in the chassis.
Have spares on hand in case the filter tears or becomes worn, or if you have to remove and wash it.
Adirty filter could restrict the flowofcooling airinto the chassis and could cause an overtemperature
condition. You need only remove the bottom front chassis panel to access the filter.
Caution Never place a wet filter in the chassis; the moisture drawn into the chassis can damage the
equipment.
To clean or replace the filter, do the following:
Step 1 Remove the bottom front panel. (See the section “Removing the Panels” on page 6.) The
edges of the air filter fit into the lower frame of the top front panel.
Step 2 Remove the filter by grasping it in the center and pulling the edges out of the frame.
Step 3 Check the condition of the filter. If the filter is dirty, or if it appears worn or torn, discard it
after you ensure that you have a spare on hand.
Step 4 If you wash the filter, refer to Step 6 to install a temporary replacement. If a replacement is
not available, shut down the system until the filter is dry and you can safely replace it. You
can leave the system running for a minute or less in order to vacuum the filter.
Step 5 Vacuum the filter or wash the filter in running water, or discard it and replace it with a new
filter.
Caution Never place a wet filter in the chassis; moisture drawn into the chassis can damage the
equipment.
Step 6 Place the newor clean, dry filter over the frame and push the edges into it with your fingers.
Ensure that all edges are tucked into the frame.
Step 7 To replace the bottom front panel, align the bottom of the panel with the holes on the front
of the chassis, then push the edges in until the ball studs snap into place.
Note The following warning is for units equipped with a DC-input power supply.
Warning Before performing any of the following procedures, ensure that power is removed from
the DC circuit. To ensure that all power is OFF, locate the circuit breaker on the panel board that
services the DC circuit, switch the circuit breaker to the OFF position, and tape the switch handle of
the circuit breaker in the OFF position. (For translations of this safety warning, refer to the section
“DC Power Disconnection Warning” on page 17.)