Compaq 470013-444 Deskpro EX Series of Personal Computers Maintenance&Serv - Page 20

Preventing Electrostatic Damage to Equipment, Personal Grounding Methods and Equipment

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3.1.2 3.1.3 3.1.4 Preventing Electrostatic Damage to Equipment Many electronic components are sensitive to ESD. Circuitry design and structure determine the degree of sensitivity. The following proper packaging and grounding precautions are necessary to prevent damage to electric components and accessories. ! To avoid hand contact, transport products in static-safe containers such as tubes, bags, or boxes. ! Protect all electrostatic parts and assemblies with conductive or approved containers or packaging. ! Keep electrostatic sensitive parts in their containers until they arrive at static-free stations. ! Place items on a grounded surface before removing them from their container. ! Always be properly grounded when touching a sensitive component or assembly. ! Avoid contact with pins, leads, or circuitry. ! Place reusable electrostatic-sensitive parts from assemblies in protective packaging or conductive foam. Personal Grounding Methods and Equipment Use the following equipment to prevent static electricity damage to equipment: ! Wrist straps are flexible straps with a minimum of one-megohm +/- 10% resistance in the ground cords. To provide proper ground, a strap must be worn snug against bare skin. The ground cord must be connected and fit snugly into the banana plug connector on the grounding mat or workstation. ! Heel straps/Toe straps/Boot straps can be used at standing workstations and are compatible with most types of shoes or boots. On conductive floors or dissipative floor mats, use them on both feet with a minimum of one-megohm +/- 10% resistance between the operator and ground. Static Shielding Protection Levels Method Antistatic plastic Voltage 1,500 Carbon-loaded plastic 7,500 Metallized laminate 15,000 Grounding Workstations To prevent static damage at the workstation, use the following precautions: ! Cover the workstation with approved static-dissipative material. Provide 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 at static-free workstations. ! Turn off power and input signals before inserting and removing connectors or test equipment. 3-2 Removal & Replacement Preliminaries

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3-2
Removal & Replacement Preliminaries
3.1.2
Preventing Electrostatic Damage to Equipment
Many electronic components are sensitive to ESD. Circuitry design and structure
determine the degree of sensitivity. The following proper packaging and grounding
precautions are necessary to prevent damage to electric components and accessories.
!
To avoid hand contact, transport products in static-safe containers such as tubes,
bags, or boxes.
!
Protect all electrostatic parts and assemblies with conductive or approved
containers or packaging.
!
Keep electrostatic sensitive parts in their containers until they arrive at static-free
stations.
!
Place items on a grounded surface before removing them from their container.
!
Always be properly grounded when touching a sensitive component or assembly.
!
Avoid contact with pins, leads, or circuitry.
!
Place reusable electrostatic-sensitive parts from assemblies in protective packaging
or conductive foam.
3.1.3
Personal Grounding Methods and Equipment
Use the following equipment to prevent static electricity damage to equipment:
!
Wrist straps
are flexible straps with a minimum of one-megohm +/- 10%
resistance in the ground cords. To provide proper ground, a strap must be worn
snug against bare skin. The ground cord must be connected and fit snugly into the
banana plug connector on the grounding mat or workstation.
!
Heel straps/Toe straps/Boot straps
can be used at standing workstations and are
compatible with most types of shoes or boots. On conductive floors or dissipative
floor mats, use them on both feet with a minimum of one-megohm +/- 10%
resistance between the operator and ground.
Static Shielding Protection Levels
Method
Voltage
Antistatic plastic
1,500
Carbon-loaded plastic
7,500
Metallized laminate
15,000
3.1.4
Grounding Workstations
To prevent static damage at the workstation, use the following precautions:
!
Cover the workstation with approved static-dissipative material. Provide 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 at static-free workstations.
!
Turn off power and input signals before inserting and removing connectors or test
equipment.