Removal Sequence; Electrostatic Discharge; Generating Static - Compaq Presario,Presario 1200-XL101 User Manual

Model XL2, XL201, XL202, XL203, XL204, XL205, XL212, XL220, XL222, XL223,
XL3, XL301, XL302, XL303, XL304, XL305, XL307, XL310, XL311,
XL312, XL314, XL320, XL323, XL325, XL326, XL327, XL330

Removal Sequence

This chapter describes the removal and replacement process for the Presario 1200XL Series
Notebook.

Electrostatic Discharge

When removing or replacing parts, be careful to discharge static electricity before touching the
internal Notebook components. A sudden discharge of static electricity from a finger or other
conductor can destroy static-sensitive devices or microcircuitry. Often the spark is neither felt nor
heard, but damage occurs. An electronic device that has been exposed to electrostatic discharge
(ESD) may not seem to be affected and work perfectly throughout a normal cycle. Although it may
function normally for a period of time, it may have been degraded in the internal layers, reducing its
life expectancy.
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.

Generating Static

The table below shows the amount of static electricity generated during common activities
associated with servicing computers.
Event
Walking across carpet
Walking across vinyl floor
Motion of bench worker
Removing DIPS from plastic tubes
Removing DIPS from vinyl trays
Removing DIPS from styrofoam
Removing bubble pack from PCBs
Packing PCBs in foam-lined box
Ä Ä Ä Ä
CAUTION: As little as 700 Volts can degrade Notebook components. Be sure to
ground yourself before touching the Notebook or its subassemblies.
P N M
RESARIO OTEBOOK AINTENANCE AND
Presario 1200 Series
Electrostatic Voltage
S G 1200 S
ERVICE UIDE ERIES
Relative Humidity
10% 40%
35,000V 15,000V
12,000V 5,000V
6,000V 800V
2,000V 700V
11,500V 4,000V
14,500V 5,000V
26,000V 20,000V
21,000V 11,000V
50%
7,500V
3,000V
400V
400V
2,000V
3,500V
7,000V
5,000V
R S 1
EMOVAL EQUENCE