Samsung 910B Panduan Servis - Halaman 2

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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.

1-1-2 Servicing the LCD Monitor

When servicing the LCD Monitor, 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).

DEVICE

UNDER

TEST

TEST ALL

EXPOSED METAL

SURFACES

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.

1 Precautions

(READING SHOULD

NOT BE ABOVE 0.5mA)

LEAKAGE

CURRENT

TESTER

EARTH

GROUND

1-1