HP Z440, Z640, and Z840 Workstation Series - Maintenance and Service Guide

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Avoid contact with pins, leads, or circuitry.
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Place reusable electrostatic-sensitive parts from assemblies in protective packaging or
nonconductive foam.
Personal grounding
methods and
equipment
Use the following items to help prevent ESD damage:
●
Wrist straps — These are exible straps with a maximum of one megohm ± 10% resistance in the
ground cords. To provide a proper ground, wear the strap against bare skin. The ground cord must
be connected and t snugly into the banana plug connector on the grounding mat or computer.
●
Heel straps, toe straps, and boot straps — These can be used at standing computers and are
compatible with most types of shoes or boots. On conductive oors or dissipative oor mats, use
them on both feet with a maximum of one megohm ± 10% resistance between the operator and
ground.
Static shielding
materials
Static shielding materials provide the following levels of protection.
Method
Antistatic plastic
Carbon-loaded plastic
Metalized laminate
Voltage
1,500V
7,500V
15,000V
Grounding the work
area to prevent static
damage
●
Cover the work surface with approved
static-dissipative material. Use a wrist strap
connected to the work surface, and properly
grounded tools and equipment.
●
Use static-dissipative mats, foot straps, or
air ionizers to give added protection.
●
Handle electrostatic-sensitive components,
parts, and assemblies by the case or PCB
laminate. Handle them only in static-free
work areas.
●
Disconnect power and input signals before
inserting and removing connectors or test
equipment.
●
Use xtures made of static-safe materials
when xtures must directly contact dissipative
surfaces.
●
Keep work area free of nonconductive
materials, such as plastic assembly aids and
Styrofoam.
●
Use eld service tools (such as cutters,
screwdrivers, and vacuums) that are
conductive.
Recommended ESD
prevention materials
and equipment
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Antistatic tape
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Antistatic smocks, aprons, and sleeve
protectors
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Conductive bins and other assembly or
soldering aids
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Conductive foam
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Conductive tabletop computers with a
ground cord of one megohm ± 10%
resistance
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Static-dissipative table or oor mats with a
hard-tie to ground
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Field service kits
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Static awareness labels
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Wrist straps and footwear straps providing one
megohm ± 10% resistance
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Material-handling packages
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Conductive plastic bags
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Conductive plastic tubes
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Conductive tote boxes
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Opaque shielding bags
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Transparent metallized shielding bags
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Transparent shielding tubes
Service considerations 47