Compaq 7000 Series Maintenance And Service Manual page 27

Compaq Presario Internet PC 7000 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
affected at all and will work perfectly throughout a normal cycle. Or it may function
PREPARATION FOR
normally for a while, then degrade in the internal layers, reducing its life expectancy.
ASSEMBLY
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
GRAPHICS CARD
Generating Static
EXPANSION CARD
(Modem or Network
The table below shows the different amounts of static electricity generated by different
Card)
activities.
1394 CARD
MEMORY MODULE
Event
HARD DRIVE
DISK DRIVE Walking across
carpet
REMOVING THE TOP
DOOR
Walking across
vinyl floor
REMOVING THE CD
STORAGE DOOR
(Lower Front Panel -
Motions of bench
Open the CD Storage
worker
Door)
OPTICAL AND MASS
Removing DIPS
STORAGE DEVICES
from plastic tubes
(CD, CD-RW and/or
TROUBLESHOOTING
JUMPER AND SWITCH INFORMATION
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
United States
REMOVAL AND REPLACEMENT PROCEDURES
ILLUSTRATED PARTS CATALOG
SPECIFICATIONS
55%
7,500 V
3,000 V
400V
400 V