600W DC-Input Power Supply Replacement Instructions 5
Prerequisites
Preventing Electrostatic Discharge 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 (or SSP), 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 for handling 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:
•
Always use an ESD-preventive 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.
Warning
For safety, periodically check the resistance value of the antistatic strap. The
measurement should be between 1 and 10 megohm.
Tools Required
This section lists the tools you will need to complete these replacement procedures.
Have the following tools available so that you can complete the replacement without interruption:
•
3/16-inch flat-blade screwdriver to loosen the captive screws on the chassis cover panel
•
Number 1 Phillips screwdriver to remove the M3 Phillips screw on the power harness cover (you
must remove the power harness cover to replace the power supply)
•
Number 2 Phillips screwdriver to remove the M4 Phillips screw on the power supply
•
Antistatic mat or antistatic foam pad for the fan tray
•
Your own ESD grounding strap or the disposable ESD-preventive strap that is included with all
spares
If the chassis is mounted in an equipment rack, ensure that there is at least 1 foot of clearance at the
noninterface processor end to remove the power supply or fan tray, both of which you must pull
straight out of the chassis. If a power strip or other equipment obstructs access, you must remove the
chassis from the rack before replacing the component.
