Compaq 1800 Guía para resolver problemas descargar pdf (Pagina 69)

RESARIO

OTEBOOK

AINTENANCE

AND

ERVICE

UIDE

1800 S

ERIES

EMOVAL

AND

EPLACEMENT

Presario 1800 Series

Models: XL180, XL181, XL182, XL183, XL185,

and XL190, XL191, XL192

Removal and Replacement

This chapter details removing and replacing each component of the Presario 1800XL units.

Electrostatic Discharge

When removing or replacing parts, be careful to discharge static electricity before touching

the Notebook’s internal components. A sudden discharge of static electricity from a finger

or other conductor can destroy static-sensitive devices and microcircuitry. Often the spark

is neither felt nor heard, but damage occurs. An electronic device exposed to an

electrostatic discharge may not seem affected and it may work perfectly throughout a

normal cycle. However, the discharge degrades internal layers, which reduces the operating

life of the device. 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.

The table below shows the amount of static electricity generated during common activities

associated with servicing computers.

ÄÄ

CAUTION: As little as 700 Volts can degrade Notebook components. Be sure to

ground yourself before touching the Notebook or its subassemblies.

Generated Electrostatic Voltage

Activity

Relative Humidity

10% 40% 50%

Walking across carpet 35,000 V 15,000 V 7,500 V

Walking across vinyl floor 12,000 V 5,000 V 3,000 V

Motions of bench worker 6,000 V 800 V 400 V

Removing DIPS from plastic tubes 2,000 V 700 V 400 V

Removing DIPS from vinyl trays 11,500 V 4,000 V 2,000 V

Removing DIPS from styrofoam 14,500 V 5,000 V 3,500 V

Removing bubble pack from PCBs 26,000 V 20,000 V 7,000 V

Packing PCBs in foam-lined box 21,000 V 11,000 V 5,000 V

1 2 ... 64 65 66 67 68 69 70 71 72 73 74 ... 124 125

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Compaq 1800 Guía para resolver problemas Pagina 69

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