HP Z840 Maintenance and Service Guide - Page 57

Recommended ESD, Static shielding

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● Avoid contact with pins, leads, or circuitry. ● 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 flexible 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 fit 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 floors or dissipative floor 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 fixtures made of static-safe materials when fixtures must directly contact dissipative surfaces. Keep work area free of nonconductive materials, such as plastic assembly aids and Styrofoam. Use field service tools (such as cutters, screwdrivers, and vacuums) that are conductive. Recommended ESD ● prevention materials and equipment ● ● ● ● ● ● Antistatic tape ● Antistatic smocks, aprons, and sleeve ● protectors Conductive bins and other assembly or ● soldering aids ● Conductive foam ● Conductive tabletop computers with a ground cord of one megohm ± 10% ● resistance ● Static-dissipative table or floor mats with a hard-tie to ground ● Field service kits ● Static awareness labels Wrist straps and footwear straps providing one megohm ± 10% resistance Material-handling packages Conductive plastic bags Conductive plastic tubes Conductive tote boxes Opaque shielding bags Transparent metallized shielding bags Transparent shielding tubes Service considerations 47

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●
Avoid contact with pins, leads, or circuitry.
●
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
flexible
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
fit
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
floors
or dissipative
floor
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
fixtures
made of static-safe materials
when
fixtures
must directly contact dissipative
surfaces.
●
Keep work area free of nonconductive
materials, such as plastic assembly aids and
Styrofoam.
●
Use
field
service tools (such as cutters,
screwdrivers, and vacuums) that are
conductive.
Recommended ESD
prevention materials
and equipment
●
Antistatic tape
●
Antistatic smocks, aprons, and sleeve
protectors
●
Conductive bins and other assembly or
soldering aids
●
Conductive foam
●
Conductive tabletop computers with a
ground cord of one megohm ± 10%
resistance
●
Static-dissipative table or
floor
mats with a
hard-tie to ground
●
Field service kits
●
Static awareness labels
●
Wrist straps and footwear straps providing one
megohm ± 10% resistance
●
Material-handling packages
●
Conductive plastic bags
●
Conductive plastic tubes
●
Conductive tote boxes
●
Opaque shielding bags
●
Transparent metallized shielding bags
●
Transparent shielding tubes
Service considerations
47