Cisco 7505 Инструкции по замене Руководство - Страница 8
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Replacing Components
Preventing Electrostatic Discharge (ESD) Damage
Electrostatic discharge (ESD) damage, which can occur when electronic boards or components are
handled improperly, can result in complete or intermittent failures. The RP, SP, and interface
processors each comprise a printed circuit board that is fixed in a metal carrier. EMI shielding,
connectors, and a handle are integral components of the carrier. However, the fan control board is a
printed circuit board that is not intended to be handled and has no frame or shielding. Handle a
processor module or fan tray by the metal frame or carrier only; avoid touching the board
(particularly avoid touching any components, traces, or the metal fingers on the edge connector).
Following are guidelines for preventing ESD damage:
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•
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•
•
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Caution
should be between 1 and 10 megohms.
Replacing Components
Figure 2 shows the location of each internal components inside the noninterface processor end of the
chassis. To access the power supply and fan tray, you must remove the chassis cover panel and
expose the chassis interior. Two captive slotted screws secure the cover panel to the chassis. The fan
tray slides into the right side of the chassis (when viewing the chassis from the noninterface
processor end). A single M4 Phillips panhead screw anchors a tab on the tray to the chassis frame.
An edge connector on the fan control board also snaps into a socket connector on the backplane. To
remove the fan tray, you need only remove the M4 screw that anchors the tray to the interior chassis
frame. You cannot replace individual fans; if a fan fails, you must replace the whole fan tray
assembly. The power supply rests on the floor of the chassis, under the card cage and backplane. Two
M3 Phillips screws secure the power supply to the interior chassis frame. The power harness cover
shields the power harness, which carries DC voltages from the power supply to a polarized connector
on the backplane. Because the power harness cover straddles both the power supply and backplane
cover, you must remove it to access the power supply. A tab at the bottom of the power harness cover
fits into a slot in the chassis floor; a single Phillips screw secures the top of the power harness cover
to the backplane cover. To remove the power supply, you need to disconnect the modular AC power
cable, remove the power harness cover, disconnect the power harness from the backplane, and
remove the two M4 Phillips screws. The noninterface processor end of the power supply has handles
for pulling the supply out of the chassis.
8 600W AC-Input Power Supply and Fan Tray Replacement Instructions
Always use an ESD wrist strap or ankle strap and ensure that it makes good skin contact.
When removing or installing a fan tray, connect the equipment end of a ground strap to an
unpainted surface of the chassis, such as a handle on the power supply.
When removing or installing a power supply, connect the equipment end of a ground strap to the
chassis ground screw on the interface processor end of the chassis, or to an unpainted surface
inside the noninterface processor end of the chassis, such as the chassis frame.
Handle printed circuit boards, such as the arbiter, by the edges only; avoid touching the board
components, traces, or connector pins.
Place removed printed circuit boards or components that contain boards on an antistatic surface
or in a static shielding bag. Place a removed board component-side-up; place a removed
processor module or fan tray board-side-up.
If you are returning a replaced part to the factory, immediately place it in a static shielding bag
to avoid ESD damage to the board.
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.
For safety, periodically check the resistance value of the antistatic strap. The measurement