Samsung SMC-210 Service Manual page 3

Precautions
10) Design Alteration Warning:
Never alter or add to the mechanical or electrical
design of this 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 warran-
ty.
11) Hot Chassis Warning:
Some TV receiver chassis are electrically connect-
ed directly to one conductor of the AC power
cord. If an isolation transformer is not used, these
units may be safely serviced only if the AC power
plug is inserted so that the chassis is connected to
the ground side of the AC source.
To confirm that the AC power plug is inserted
correctly, do the following:Using an AC voltmeter,
measure the voltage between the chassis and a
known earth ground. If the reading is greater
than 1.0V, remove the AC power plug, reverse its
polarity and reinsert. Re-measure the voltage
between the chassis and ground.
12) Some TV chassis are designed to operate with 85
volts AC between chassis and ground, regardless
of the AC plug polarity.
These units can be safely serviced only if an isola-
tion transformer inserted between the receiver
and the power source.
13) Some TV chassis have a secondary ground system
in addition to the main chassis ground. This sec-
ondary ground system is not isolated from the
AC power line. The two ground systems are elec-
trically separated by insulating material that must
not be defeated or altered.
14) Components, parts and wiring that appear to
have overheated or that are otherwise damaged
should be replaced with parts that meet the origi-
nal specifications. Always determine the cause of
damage or overheating, and correct any potential
hazards.
15) Observe the original lead dress, especially near
the following areas: Antenna wiring, sharp edges,
and especially the AC and high voltage power
supplies. Always inspect for pinched, out-of-
place, or frayed wiring. Do not change the spac-
ing between components and the printed circuit
board. Check the AC power cord for damage.
Make sure that leads and components do not
touch thermally hot parts.
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16) Picture Tube Implosion Warning:
The picture tube in this receiver employs "inte-
gral implosion" protection. To ensure continued
implosion protection, make sure that the replace-
ment picture tube is the same as the original.
17) Do not remove, install or handle the picture tube
without first putting on shatterproof goggles
equipped with side shields. Never handle the pic-
ture tube by its neck. Some "in-line" picture tubes
are equipped with a permanently attached deflec-
tion yoke; do not try to remove such "permanent-
ly attached" yokes from the picture tube.
18) Product Safety Notice:
Some electrical and mechanical parts have special
safety-related characteristics which might not be
obvious from visual inspection. These safety fea-
tures and the protection they give might be lost if
the replacement component differs from the origi-
nal-even if the replacement is rated for higher
voltage, wattage, etc.
Components that are critical for safety are indicat-
ed in the circuit diagram by shading, (
Use replacement components that have the same
ratings, especially for flame resistance and dielec-
tric strength specifications. A replacement part
that does not have the same safety characteristics
as the original might create shock, fire or other
hazards.
) or ( ).