Precaution; Safety Precautions - Samsung HT-D4500 Service Manual

1. Precaution

1. Precaution
Follow these safety instructions while servicing the ESD to prevent damage and to protect against potential hazards
such as electrical shock and X-rays.

1.1. Safety Precautions

1) When reinstalling the chassis and its assemblies, be sure to restore all of the protective devices, including the control
knobs and the compartment covers.
2) Make sure that there are no cabinet openings through which people (particularly children) can make contact with
dangerous internal components.
3) Design Alteration Warning:
Never alter or add to the mechanical or electrical design of the unit.
Example: Do not add auxiliary audio or video connectors. Such alterations might create a safety hazard.
Also, any design changes or additions will void the manufacturer's warranty.
4) Leakage Current Hot Check
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).
With the unit completely reassembled, plug the AC cord directly into a 120V AC outlet. With the unit's power switched
from the ON to the OFF position, measure the current between a known ground and all exposed metal parts.
Known Grounds - Earth
Known Metal parts - screwheads, metal cabinets, etc.
DEVICE
UNDER
TES T
EXPO S ED METAL
SU RFACES
2-WIRE CORD
ALSO TES T WITH
PLUG REVER S ED
(US ING AC
ADAPTER P LUG
AS R EQ UIRED)
Figure 1.1 AC Leakage Test
1-1
Figure 1.1 AC Leakage
LEAKAGE
(READING
CURRENT
SH OULD NOT BE
TES TER
ABOVE 0.5mA)
TES T ALL
Test:
EARTH
GROUND
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