Module Removal And Replacement; Overview; Esd Precautions; Preventing Electrostatic Discharge - Lenovo ThinkSystem DS Series Hardware Installation And Maintenance Manual

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Module removal and replacement

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. Certain procedures refer to related documentation. See
of these documents and where to find them online.
NOTE: CRU replacement procedures are grouped by chassis form factor.
• For 2U12 and 2U24 CRU replacement, see
• For 5U84 CRU replacement, see

ESD precautions

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.
• Use conductive field service tools.
116 Module removal and replacement
"CRU replacement for 2U chassis" (page
"CRU replacement for 5U chassis" (page
"Related documentation" (page 14)
117).
133).
for a list