Electrostatic Discharge - Compaq PRESARIO 5000 SERIES Maintenance And Service Manual

Compaq Presario Internet PC 5000 Series Computers
PRODUCT DESCRIPTION
REMOVAL AND REPLACEMENT
PROCEDURES

Electrostatic Discharge

Electrostatic
Discharge
A sudden discharge of static electricity from a finger or other conductor can destroy
Service
static-sensitive devices or microcircuitry. Often the spark is neither felt nor heard, but
Considerations
damage occurs. An electronic device exposed to electrostatic discharge (ESD) may not be
Preparation for affected at all and will work perfectly throughout a normal cycle. Or it may function
Disassembly
normally for a while, then degrade in the internal layers, reducing its life expectancy.
Serial Number
Networks built into many integrated circuits provide some protection, but in many cases,
the discharge contains enough power to alter device parameters or melt silicon junctions.
Side Access Panel
Generating Static
Graphics Card
The table below shows the different amounts of static electricity generated by different
Expansion Card
activities.
(Modem or Network
Card)
1394 Card
Memory Module
Hard Drive
Disk Drive
Removing the Top
Door
Removing the CD
Storage Door
(Lower Front Panel -
Open the CD Storage
Door)
Optical and Mass
TROUBLESHOOTING
JUMPER AND SWITCH
Event
Walking across carpet
Walking across vinyl floor
Motions of bench worker
Removing DIPS from
plastic tubes
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INFORMATION
(Return to Service Considerations)
Relative Humidity
10% 40%
35,000 V 15,000 V
12,000 V 5,000 V
6,000 V 800 V
2,000 V 700 V
Removal and Replacement Procedures
ILLUSTRATED PARTS CATALOG
SPECIFICATIONS
55%
7,500 V
3,000 V
400V
400 V
United States