Compaq Presario 7400 Series Maintenance And Service Manual page 70

Compaq.com - Compaq Presario Maintenance and Service Guide - 7400 Series
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Removing DIPS from vinyl trays
Removing DIPS from Styrofoam
Removing bubble pack from PCBs
Packing PCBs in foam-lined box
NOTE: 700 volts can degrade a product!
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:
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.
Place reusable electrostatic-sensitive parts from assemblies into 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 grounded and constructed of materials selected to
avoid static charging. When grounding is not possible, use an ionizer to dissipate electric charges.
Preventing Damage to Drives
To prevent static damage to hard drives, use the following precautions:
Handle drives gently, using static-guarding techniques.
Store drives in the original shipping containers.
Avoid dropping drives from any height onto any surface.
Handle drives on surfaces that have at least one inch of shock-proof foam.
Always place drives 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
11,500 V 4,000 V
14,500 V 5,000 V
26,000 V 20,000 V
21,000 V 11,000 V
2,000 V
3,500 V
7,000 V
5,000 V