Cisco Systems MAS-7KLED User Manual

Doc. No.

78-1060-02

Cisco 7000 and Cisco 7507
LED Board Replacement Instructions

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.

Copyright © 1995

Cisco Systems, Inc.

All rights reserved.

The top and bottom front chassis panels comprise plastic bezels on a metal frame and should be
replaced ifthey 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 November1, 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.

1

Product Overview

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)

Cisco 7000

FrameFilter

H1336a

(gray)

UPPER

LOWER

NORMAL

POWER

POWER

Captive screws

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 removethe 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.

2 Cisco 7000 and Cisco 7507 LED Board Replacement Instructions

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)

Product Overview

UPPER
POWER

LOWER
POWER

NORMAL

UPPER

LOWER

POWER

NORMAL

POWER

Cisco 7000

H1407a

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

LED board
spring

Backplane connector

LED board

LEDs

LED board

brackets
Board locking
pin

H1387a

Cisco 7000 and Cisco 7507 LED Board Replacement Instructions 3

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 removethe top front chassis panel to access the LED board.
Carefully follow the top front chassis panel removalinstructions to avoid damaging the LEDs or the
LED board.

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

LED board spring

LED board
(mounted on horizontal
plane in chassis)

LEDs

Blower connection

Blower air ducts to

interface processor

compartment

4 Cisco 7000 and Cisco 7507 LED Board Replacement Instructions

H3898

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. Voordatu 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 Tämä varoitusmerkki merkitsee vaaraa. Olet tilanteessa, joka voi johtaa 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

Körperverletzungführen könnte. BevorSie mit der Arbeit an irgendeinemGerät 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
relativiaicircuiti elettrici ed essere 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
elektriskekretser innebærer, samt gjøre degkjent med vanlig praksis nårdet 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 LED Board 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.

• 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 ActivityWarning”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 intended to be handledand has no frameorshielding. Handle the LEDboard by the edges 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.

6 Cisco 7000 and Cisco 7507 LED Board Replacement Instructions