Cisco 7000 and 7507 led board mas-7kled Guide

Doc. No.

Cisco Systems, Inc.

Cisco 7000 and Cisco 7507

LED Board Replacement Instructions

78-1060-02

Product Number: MAS-7KLED

Customer Order Number: DOC-781060=

This document contains instructions for replacing the top and bottom front chassis panels and the

LED board in the Cisco 7000 and Cisco 7507.

Note The LED board 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 top and bottom front chassis panels comprise plastic bezels on a metal frame and should be

replaced if they become warped or broken. The LED board, which contains the light-emitting diodes

(LEDs) for the three front-panel system status indicators (normal, upper power, and lower power), is

mounted inside the front of the chassis.

The sections in this document include the following:

•Product Overview, page 2

•Prerequisites, page 5

•Removing and Replacing the Front Chassis Panels, page 7

•Removing and Replacing the LED Board, page 12

•Cisco Information Online, page 20

Caution The following applies to Cisco 7000 chassis only: if you remove AC-input power supplies

from a Cisco 7000 and replace them with DC-input power supplies, you might need to replace the

LED board in the chassis, if it was shipped before November 1, 1994. In this earlier chassis, the LED

circuitry will not recognize and indicate the presence of the new DC-input power supplies. If

replacement is necessary, use this document to replace the LED board. (This document is also

available on UniverCD.)

If the chassis was shipped after November 1, 1994, no LED board replacement is required.

2Cisco 7000 and Cisco 7507 LED Board Replacement Instructions

Product Overview

This section describes the top and bottom front chassis panels and the LED board.

Top and Bottom Front Chassis Panels

The top and bottom front chassis panels each comprise a plastic injected-molded bezel on a metal

frame. The top front panel covers the entire front chassis opening and attaches to the bottom of the

chassis frame with two captive screws. (See Figure 1)

Figure 1 Chassis Top Front Panel (Shown with Bottom Front Panel Removed)

The lower section of the top front panel houses the air ﬁlter, which cleans intake air drawn in by the

blower. Three cutouts in the top of the panel contain semiopaque black plastic windows, through

which the three system

LEDs are visible when they are on. EMI shielding surrounds the entire outer edge of the top front

panel. The shielding acts as a spring, and compresses when you push the panel into the chassis to

keep the panel ﬁtted tightly into the chassis opening.

The bottom front panel is vented and covers the lower area of the top front panel that houses the air

ﬁlter. The bottom front panel ﬁts over the lower section of the top front panel and attaches to the

chassis with ball studs. You must remove the bottom front panel before you can remove the top front

panel. You can remove the bottom front panel while the system is operating to access or clean the

air ﬁlter, but always turn system power off before removing the top front panel.

The chassis panels provide shielding against electromagnetic interference (EMI) and work with the

blower and air ﬁlter to maintain a constant ﬂow of cooling air through the chassis. Replace the

chassis panels if they become warped or broken.

UPPER

POWER LOWER

POWER NORMAL

Cisco 7000

H1336a

Captive screws

FrameFilter

(gray)

Cisco 7000 and Cisco 7507 LED Board Replacement Instructions 3

Product Overview

LED Board Location and Description

The LED board contains the three LEDs that report system software (normal) and power supply

(upper power and lower power) status through semiopaque panels on the front of the chassis.

Figure 2 shows the three system status indicators.

Figure 2 System Status Indicators (Front-Panel LEDs)

The LED board is mounted to the backplane on a horizontal plane near the top of the chassis interior

(shown edge-on in Figure 4). The board slides into two brackets mounted to the front of the

backplane, and a connector on the rear of the LED board mates with a connector on the backplane.

Figure 3 LED Board

UPPER

POWER LOWER

POWER NORMAL

Cisco 7000

UPPER

POWER LOWER

POWER NORMAL

H1407a

H1387a

LED board

brackets

Board locking

LED board

spring Backplane connector

LEDs

LED board

4Cisco 7000 and Cisco 7507 LED Board Replacement Instructions

Product Overview

Two pins in the brackets and a metal spring that butts up against the ceiling of the chassis keep the

board in place. (See Figure 3.) You must remove the top front chassis panel to access the LED board.

Carefully follow the top front chassis panel removal instructions to avoid damaging the LEDs or the

LED board.

Figure 4 Internal Chassis Front View (Showing the LED Board Location)

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 LED Board Replacement Instructions 5

Prerequisites

Prerequisites Before you begin an 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 pratichestandard perla prevenzionediincidenti.

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.

6Cisco 7000 and Cisco 7507 LED Board Replacement Instructions

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.

•Always turn all power supplies off and disconnect power cords before removing the top front

chassis panel. 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 guidelines that follow 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 translation 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 translation of this safety warning, refer to the section

“Chassis Warning—Disconnecting Telephone-Network Cables” on page 15.)

Caution Always handle an LED board by the edges only; avoid touching the board components,

traces, or connector pins.

Preventing Electrostatic Discharge Damage

Electrostatic discharge (ESD) damage, which occurs when electronic boards or components are

improperly handled, can result in complete or intermittent failures. The processor modules each

comprise a printed circuit board that is ﬁxed in a metal carrier. Electromagnetic interference (EMI)

shielding, connectors, and a handle are integral components of the carrier. The LED board, however,

isnot intendedto be handledand hasno frame orshielding. Handlethe LEDboard by theedges only;

never touch the board components, traces, or connector pins.

Following are guidelines for preventing ESD damage:

•Always use an ESD strap and ensure that it makes good skin contact.

Cisco 7000 and Cisco 7507 LED Board Replacement Instructions 7

Removing and Replacing the Front Chassis Panels

•When removing or installing an LED board, connect the equipment end of the ground strap to an

unpainted surface of the chassis, such as the vertical metal frame that is exposed when the front

chassis panels are removed.

•Handle boards by the edges only; avoid touching the board components, traces, or connector

pins.

•Place a removed board component-side-up on an antistatic surface or in a static shielding bag. If

you are returning the board to the factory, immediately place it in a static shielding bag to avoid

ESD damage.

•Avoid contact between the board and clothing. The wrist strap only protects the board from ESD

voltages on the body; ESD voltages on clothing can still cause damage.

Note For safety, periodically check the resistance value of the antistatic strap. The measurement

should be within the range of 1 and 10 megohms.

List of Parts and Tools

You need the following tools to replace a front chassis panel or an LED board:

•If you are replacing the top front chassis panel or the LED board, you need a 3/16-inch ﬂat-blade

or Number 2 Phillips screwdriver to remove the top front chassis panel. 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.

•If you are replacing an LED board, you need an antistatic mat, foam pad, or bag for the removed

board (immediately place a removed board into an antistatic bag if you will return it to the

factory)

No tools are required to remove or replace the bottom front panel or the LED board.

Removing and Replacing the Front Chassis Panels

You must remove the top and bottom front chassis panels to access the chassis interior to replace the

LED board. Carefully follow the instructions for removing and replacing the top front panel; 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 translation 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 translation of this safety

warning, refer to the section “Electric Shock Warning” on page 17.)

Note The following warning is for units with DC-input power supplies.

8Cisco 7000 and Cisco 7507 LED Board Replacement Instructions

Removing and Replacing the Front Chassis Panels

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 translation 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 5.)

Step 3 On the top front panel, use a screwdriver to loosen the two captive screws at the bottom

edge of the panel frame.

Figure 5 Removing the Bottom Front Panel

Step 4 Place one hand against the top front center of the panel to brace it. (See Figure 6a.) The top

of the panel acts as a pivot point when you pull the bottom out and away from the chassis.

UPPER

POWER LOWER

POWER NORMAL

Cisco 7000

H1335a

Cisco 7000 and Cisco 7507 LED Board Replacement Instructions 9

Removing and Replacing the Front Chassis Panels

Figure 6 Removing the Top Front Panel

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 6a.)

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 6a.) 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 6b.)

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 7a on page 11.)

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 7a.)

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 7a) and pivot the bottom

of the panel toward the chassis until the panel frame meets the chassis. (See Figure 7b.)

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 7c.)

Cisco 7000

UPPER

POWER LOWER

POWER NORMAL

Cisco 7000

UPPER

POWER LOWER

POWER NORMAL

H1459a

10 Cisco 7000 and Cisco 7507 LED Board Replacement Instructions

Removing and Replacing the Front Chassis Panels

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 7d.)

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 7e.) 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 LED Board Replacement Instructions 11

Removing and Replacing the Front Chassis Panels

Figure 7 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

12 Cisco 7000 and Cisco 7507 LED Board Replacement Instructions

Removing and Replacing the LED Board

The LED board slides horizontally into two mounting brackets near the top of the chassis interior

and connects directly to the backplane. You must turn all system power off and remove the top and

bottom front chassis panels to access the chassis interior.

Warning Read the installation instructions before you connect the system to its power source. (For

translation of this safety warning, refer to the section “Installation Warning” on page 19.)