Cisco 7000 User manual

Copyright © 1993, Cisco Systems, Inc.1
All rights reserved.
Doc. No. 78-1060-01 Rev. A0
Cisco 7000 Front Chassis Panel and
LED Board and Replacement
Cisco Part Numbers MAS-7KTFP, MAS-7KBFP, MAS-7KLED
This document contains instructions for replacing the top and bottom front chassis
panels and the LED board in the Cisco 7000. 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:
■“Obtaining Technical Assistance,” page 2
For installation problems that you cannot resolve, this section provides instructions
for obtaining technical assistance and lists the information you need before you call
■“Product Overview,” page 2
Brief physical and functional descriptions of the front chassis panels and the LED
board
■“Prerequisites,” page 5
Safety guidelines to prevent injury to yourself or damage to the equipment, and the
tools and parts you will need for these installations
■“Removing and Replacing the Front Chassis Panels,” page 7
Procedures for removing and replacing the front chassis panels to replace damaged
panels or to access the front interior of the chassis to replace internal components
■“Removing and Replacing the LED Board,” page 10
Procedures for removing and replacing a failed LED board, and for restarting the
system and verifying that the new LED board is installed correctly and functioning
properly
Warning: You must turn OFF all system power and remove the front chassis panels
to access the LED board. The system backplane, which is exposed when the front panels
are removed, carries dangerous current levels. Before opening the chassis, read “Safety
Guidelines” on page 5 to avoid injury.

2Cisco 7000 Front Chassis Panel and LED Board and Replacement
Obtaining Technical Assistance
This document contains instructions for replacing the Cisco 7000 LED board
(MAS-7KLED) and the top and bottom front chassis panels (MAS-7KTFP and
MAS-7K-BFP). If you encounter problems that you are unable to resolve, contact a
service representative or the Technical Assistance Center (TAC) for assistance. You can
phone the TAC at 800 553-2447, or send e-mail to [email protected].
Before you call a service representative, have the following information ready:
■Date you received the Cisco 7000
■Chassis serial number (located on a label on the right rear deck of the chassis)
■Type of installation or upgrade you are performing
■Title and Doc. No. of this document (from the front page)
■Brief description of the problem you are having
■Brief explanation of the steps you have taken to isolate and resolve the problem
■Maintenance agreement or warranty information
Refer to the Cisco 7000 Hardware Installation and Maintenance publication for complete
system installation and startup procedures, and for physical descriptions of chassis
components.
Product Overview This section describes the LED board and the top and bottom front chassis panels.
Top and Bottom Front Chassis Panels
The top and bottom front chassis panels each comprise a plastic injected-molded bezel
onametalframe.Thetopfrontpanelcoverstheentirefrontchassisopeningandattaches
to the bottom of the chassis frame with two captive screws (see Figure 1). 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 semi-opaque black plastic
windows, through which the three system LEDs are visible when they are lit. 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
panelandattachestothechassiswithballstuds. Youmustremovethebottom frontpanel
before you can remove the top front panel.
You can removethebottomDfrontpanelwhilethesystemisoperatingtoaccessorclean
the air filter, but always turn system power off before removing the top front panel.

Cisco 7000 Front Chassis Panel and LED Board and Replacement 3
Figure 1 Chassis Top Front Panel, Shown with Bottom Front Panel Removed
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.
LED Board Description
The LED board contains the three LEDs that report system software (Normal) and
power supply (Upper Power and Lower Power) status through semi-opaque panels on
the front of the chassis. Figure 2 shows the three system status indicators.
Figure 2 System Status Indicators (Front-Panel LEDs)
UPPER
POWER LOWER
POWER NORMAL
Cisco 7000
H1336a
Captive screws
FrameFilter
(gray)
UPPER
POWER LOWER
POWER NORMAL
Cisco 7000
UPPER
POWER LOWER
POWER NORMAL
H1407a

4Cisco 7000 Front Chassis Panel and LED Board and Replacement
The LED board is mounted to the backplane on a horizontal plane near the top of the
chassis interior (shown edge-on in Figure 3). 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 Cisco 7000 Internal Chassis Components, Front View
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 4). 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.
H1334a
LED board 
(mounted on horizontal
plane in chassis)
LED board spring
LEDs
Arbiter board
connector
Blower power
connection
Blower air ducts to
interface processor 
compartment

Cisco 7000 Front Chassis Panel and LED Board and Replacement 5
Figure 4 LED Board
Prerequisites Before you begin an installation, review the safety guidelines in this section to avoid
injuring yourself or damaging the equipment.
Safety Guidelines Thefollowing guidelineswillhelptoensureyour safety andprotecttheequipment. 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 lightening storm.
■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.
H1387a
LED board
brackets
Board locking
pin
LED board
spring Backplane connector
LEDs
LED board

6Cisco 7000 Front Chassis Panel and LED Board and Replacement
Preventing Electrostatic Discharge (ESD) Damage
Electrostatic discharge (ESD) damage, which occurs when electronic boards or
componentsareimproperlyhandled, can resultin complete orintermittentfailures.The
RP, SP, and IPs 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, is not intended to be handled and
has no frame or shielding. Handle the LED board by the edges only; never touch the
board components, traces, or connector pins.
Caution: Always handle an LED board by the edges only; avoid touching 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.
■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 Mohms.
List of Parts and ToolsYou 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 No. 2 Phillips screwdriver to remove the top front chassis
panel. Earlier chassis (the first several hundred shipped) use slotted screws, and later
chassis use 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.

Cisco 7000 Front Chassis Panel and LED Board and Replacement 7
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 accessing the chassis interior, turn all power supply switches OFF
(O) and unplug the power cord. When the power is ON (|), high current (100A) is
exposed on the backplane and around the power supply and wiring harnesses.
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).
Figure 5 Removing the Bottom Front Panel
UPPER
POWER LOWER
POWER NORMAL
Cisco 7000
H1335a

8Cisco 7000 Front Chassis Panel and LED Board and Replacement
Step 3: On the top front panel, use a screwdriver to loosen the two captive screws at
the bottom edge of the panel frame.
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.
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 Figure6a). Because
ofthe tightly compressedEMI shielding, youwillhavetousesignificantforce
to pull the bottom of the panel outward. However, be careful that you do not
pullthe panel morethan twoinchesawayfromthechassis,or youcandamage
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 6a).
Cisco 7000
UPPER
POWER LOWER
POWER NORMAL
Cisco 7000
UPPER
POWER LOWER
POWER NORMAL
H1459a
ab

Cisco 7000 Front Chassis Panel and LED Board and Replacement 9
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
Cisc
Guide tab slides up into
slot in chassis
a
bc
d
Cisco 7000
UPPER
POWER LOWER
POWER NORMAL
e

10Cisco 7000 Front Chassis Panel and LED Board and Replacement
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
chassisopening.Failuretoalignthepanelatthis pointcanresultinequipment
damage when performing the next step.
Step 4: Pushthe panel upward topush the tabs into theslots (see Figure7a)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: Whenthepanel is flush against the frontof the chassis, push the panel upward
until the bottom of the panel is level with the bottom of the chassis opening
(see Figure 7c).
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
frontsidesofthe panel areflushagainstthefrontofthechassis(see Figure 7d).
You will have to use significant force to compress the EMI shielding enough
tofit into the opening. If the panel resists,pull it slightly downwardandmake
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.
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: Before accessing the chassis interior, turn the power switch to OFF (O)
and unplug the power cord. The backplane carries dangerous current levels.