Dell 1700FP Manuel d'entretien - Page 3

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1 Precautions

Follow these safety, servicing and ESD precautions to prevent damage and to protect against potential hazards such as

electrical shock.

1-1 Safety Precautions

1-1-1 Warnings

For continued safety, do not attempt to modify the

circuit board.

Disconnect the AC power and DC Power Jack

before servicing.

When the chassis is operating, semiconductor

heatsinks are potential shock hazards.

1-1-2 Servicing the LCD Monitor

When servicing the LCD Monitor, remove the static

charge by connecting a 10k ohm resistor in series

with an insulated wire (such as a test probe)

between the chassis and the anode lead.

(Disconnect the AC line cord from the AC outlet.)

It is essential that service technicians have an

accurate voltage meter available at all times. Check

the calibration of this meter periodically.

1-1-3 Fire and Shock Hazard

Before returning the monitor to the user, perform the

following safety checks:

Inspect each lead dress to make certain that the

leads are not pinched or that hardware is not

lodged between the chassis and other metal parts in

the monitor.

Inspect all protective devices such as nonmetallic

control knobs, insulating materials, cabinet backs,

adjustment and compartment covers or shields,

isolation resistor-capacitor networks, mechanical

insulators, etc.

Leakage Current Hot Check (Figure 1-1): WARNING:

Do not use an isolation transformer during this test.

Use a leakage current tester or a metering system

that complies with American National Standards

Institute (ANSI C101.1, Leakage Current for

Appliances), and Underwriters Laboratories (UL

Publication UL1410, 59.7).

1700FP

DEVICE

UNDER

TEST

EXPOSED METAL

2-WIRE CORD

ALSO TEST WITH

PLUG REVERSED

(USING AC ADAPTER

PLUG AS REQUIRED)

Figure 1-1. Leakage Current Test Circuit

With the unit completely reassembled, plug the AC

line cord directly into a 120V AC outlet. With the

unit's AC switch first in the ON position and then

OFF, measure the current between a known earth

ground (metal water pipe, conduit, etc.) and all

exposed metal parts, including: metal cabinets,

screwheads and control shafts. The current

measured should not exceed 0.5 milliamp. Reverse

the power-plug prongs in the AC outlet and repeat

the test.

1-1-4 Product Safety Notices

Some electrical and mechanical parts have special

safety-related characteristics which are often not

evident from visual inspection. The protection they give

may not be obtained by replacing them with

components rated for higher voltage, wattage, etc. Parts

that have special safety characteristics are identified by

on schematics and parts lists. A substitute

replacement that does not have the same safety

characteristics as the recommended replacement part

might create shock, fire and / or other hazards. Product

safety is under review continuously and new

instructions are issued whenever appropriate.

(READING SHOULD

NOT BE ABOVE 0.5mA)

LEAKAGE

CURRENT

TESTER

TEST ALL

SURFACES

EARTH

GROUND

1-1