Cisco 7000 and 7507 LED Board MAS-7KLED Manual - Halaman 6

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Cisco 7000 and 7507 LED Board MAS-7KLED Manual

Preventing Electrostatic Discharge (ESD) Damage

List of Parts and Tools

6Cisco 7000 Front Chassis Panel and LED Board and Replacement

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

components are improperly handled, can result in complete or intermittent failures. 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.

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 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.