IBM Medium J11, Руководство по установке и обслуживанию оборудования

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Chapter 7. Module removal and installation
Overview
This chapter provides procedures for replacing CRUs (customer-replaceable units), including precautions,
removal instructions, installation instructions, and verification of successful installation. Each procedure
addresses a specific task.
Note: Unless otherwise noted within a passage pertaining to a particular CRU, the replacement procedure
should be completed within 3 minutes of the removal of a defective module. Do not remove a faulty
module unless you have the replacement module available and ready for insertion into the slot.
ESD precautions
Precautions and preventive measures when handling or installing electrostatic-sensitive parts.
Overview
Before you begin any of the procedures, consider the following precautions and preventive measures.
Preventing electrostatic discharge
To prevent electrostatic discharge (ESD) from damaging the system, be aware of the precautions to
consider when setting up the system or handling parts. A discharge of static electricity from a finger or
other conductor may damage system boards or other static-sensitive devices. This type of damage may
reduce the life expectancy of the device.
CAUTION: Parts can be damaged by electrostatic discharge. Follow these precautions:
• Avoid hand contact by transporting and storing products in static-safe containers.
• Keep electrostatic-sensitive parts in their containers until they arrive at static-protected
workstations.
• Place parts in a static-protected area before removing them from their containers.
• Avoid touching pins, leads, or circuitry.
• Always be properly grounded when touching a static-sensitive component or assembly.
• Remove clutter (plastic, vinyl, foam) from the static-protected workstation.
Grounding methods to prevent electrostatic discharge
Several methods are used for grounding. Adhere to the following precautions when handling or installing
electrostatic-sensitive parts.
CAUTION: Parts can be damaged by electrostatic discharge. Use proper anti-static protection:
• Keep the replacement CRU in the ESD bag until needed; and when removing a CRU from the
enclosure, immediately place it in the ESD bag and anti-static packaging.
• Wear an ESD wrist strap connected by a ground cord to a grounded workstation or unpainted
surface of the computer chassis. Wrist straps are flexible straps with a minimum of 1 megohm (±
10 percent) resistance in the ground cords. To provide proper ground, wear the strap snug
against the skin.
• If an ESD wrist strap is unavailable, touch an unpainted surface of the chassis before handling
the component.
• Use heel straps, toe straps, or boot straps at standing workstations. Wear the straps on both feet
when standing on conductive floors or dissipating floor mats.
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