Cisco Nexus 7000 series Guide

Doc. No.

Cisco Systems, Inc.

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

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

SSP

Air dam

System blower

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

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

Guide tab slides up into

slot in chassis

Cisco 7000

UPPER

POWER LOWER

POWER NORMAL

10 Cisco 7000 and Cisco 7507 Air Filter and Chassis Blower Replacement Instructions

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.)

Cisco 7000 and Cisco 7507 Air Filter and Chassis Blower Replacement Instructions 11

Replacing the Chassis Blower

The blower is located at the bottom of the chassis interior. (See .) Two air ducts on the rear of the

blower, shown shaded in the illustration, ﬁt snugly into the two cutouts in the backplane. The blower

is secured to the backplane with three large captive screws, which are shown in Figure 6. The captive

screws on most blowers are 3-mm center-hex Allen-head screws, but the earliest chassis shipped

used Phillips-head screws. A 3-mm T-handle driver with a long (9-inch) handle is shipped with the

spare blower.

Although the far left captive screw on the blower is slightly obscured from view by the left lip of the

chassis and the left blower air duct, an access hole in the lip of the chassis provides access to this

screw. By inserting the T-handle driver (or screwdriver) straight into the access hole, you should be

able to ﬁnd the screw without any trouble. However, if you do have trouble ﬁnding the screw, and if

the lighting around the chassis is poor, you may need a ﬂashlight to locate the screw and position the

driver correctly.