HP Armada 1100 Armada 1100 Family of Personal Computers Maintenance and Servic - Page 68

Table 4-2. Static-Shielding Protection Levels, Preventing Electrostatic Damage to Equipment

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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: o Protect all electrostatic parts and assemblies with conductive or approved containers or packaging. o Keep electrostatic-sensitive parts in their containers until they arrive at static-free stations. o Place items on a grounded surface before removing them from their container. o Always be properly grounded when touching a sensitive component or assembly. o Place reusable electronic-sensitive parts from assemblies in protective packaging or conductive foam. Use transporters and conveyors made of antistatic belts and metal roller bushings. Mechanized equipment used for moving materials must be wired to ground and proper materials selected to avoid static charging. When grounding is not possible, use an ionizer to dissipate electric charges. Removing Batteries Compaq recommends that you remove all batteries from the computer before beginning the disassembly procedures. Failure to do so could cause damage to computer components. Preventing Damage to Drives To prevent static damage to hard drives, use the following precautions: o Handle drives gently, using static-guarding techniques. o Store drives in the original shipping containers. o Avoid dropping drives from any height onto any surface. o Handle drives on surfaces that have at least one inch of shock proof foam. o Always place drives with the PCB assembly side down on the foam. Grounding Methods The method for grounding must include a wrist strap or a foot strap at a grounded workstation. When seated, wear a wrist strap connected to a grounded system. When standing, use footstraps and a grounded floor mat. Table 4-2. Static-Shielding Protection Levels Method Voltages Antistatic Plastic 1,500 Carbon-Loaded Plastic 7,500 Metallized Laminate 15,000

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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:
o Protect all electrostatic parts and assemblies with conductive or
approved containers or packaging.
o Keep electrostatic-sensitive parts in their containers until they arrive
at static-free stations.
o Place items on a grounded surface before removing them from their
container.
o Always be properly grounded when touching a sensitive component or
assembly.
o Place reusable electronic-sensitive parts from assemblies in protective
packaging or conductive foam.
Use transporters and conveyors made of antistatic belts and metal roller
bushings.
Mechanized equipment used for moving materials must be wired to
ground and proper materials selected to avoid static charging. When
grounding is not possible, use an ionizer to dissipate electric charges.
Removing Batteries
Compaq recommends that you remove all batteries from the computer before
beginning the disassembly procedures. Failure to do so could cause damage
to computer components.
Preventing Damage to Drives
To prevent static damage to hard drives, use the following precautions:
o Handle drives gently, using static-guarding techniques.
o Store drives in the original shipping containers.
o Avoid dropping drives from any height onto any surface.
o Handle drives on surfaces that have at least one inch of shock proof
foam.
o Always place drives with the PCB assembly side down on the foam.
Grounding Methods
The method for grounding must include a wrist strap or a foot strap at a
grounded workstation. When seated, wear a wrist strap connected to a
grounded system. When standing, use footstraps and a grounded floor mat.
Table 4-2. Static-Shielding Protection Levels
===========================================================================
Method
Voltages
===========================================================================
Antistatic Plastic
1,500
Carbon-Loaded Plastic
7,500
Metallized Laminate
15,000
===========================================================================
Preventing Electrostatic Damage to Equipment