Samsung 2220WM - SyncMaster - 22" LCD Monitor Manual de serviço - Página 4
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Precautions
Follow these safety, servicing and ESD precautions to prevent damage and to protect against potential hazards
such as electrical shock.
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Safety Precautions
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Warnings
1. For continued safety, do not attempt to modify the
circuit board.
2. Disconnect the AC power and DC power jack
before servicing.
1-1-2
Servicing the LCD Monitor
1. When servicing the LCD Monitor, Disconnect the AC
line cord from the AC outlet.
2. It is essential that service technicians have an
accurate voltage meter available at all times.
Check the calibration of this meter periodically.
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Fire and Shock Hazard
Before returning the monitor to the user, perform
the following safety checks:
1. 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.
2. 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.
3. 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).
Figure 1-1. Leakage Current Test Circuit
4.
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,
screw heads 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.
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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.
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