Cisco 7000 and 7507 LED Board MAS-7KLED Инструкции по замене Руководство - Страница 6
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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.
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In addition, use the guidelines that follow when working with any equipment that is connected to
telephone wiring or other network cabling.
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Warning
activity. (For translation of this safety warning, refer to the section "Lightning Activity Warning" on
page 15.)
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Warning
with telephone-network voltages. (For translation of this safety warning, refer to the section
"Chassis Warning—Disconnecting Telephone-Network Cables" on page 15.)
Caution
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,
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.
Following are guidelines for preventing ESD damage:
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6 Cisco 7000 and Cisco 7507 LED Board Replacement Instructions
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.
Never install telephone wiring during a lightning storm.
Do not work on the system or connect or disconnect cables during periods of lightning
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.
Before opening the chassis, disconnect the telephone-network cables to avoid contact
Always handle an LED board by the edges only; avoid touching the board components,
Always use an ESD strap and ensure that it makes good skin contact.