Samsung CB21N112TZXXEC, Service Manual

1-1 Safety Precautions  (Continued)

9. High voltage is maintained within specified

limits by close-tolerance, safety-related 
components and adjustments.  If the high 
voltage exceeds the specified limits, check
each of the special components. 

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 warranty.

11. Hot Chassis Warning:

Some TV receiver chassis are electrically 
connected 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 isolation
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 secondary ground system is not 
isolated from the AC power line. The two
ground  systems are  electrically 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 original specifications.  Always 
determine the cause of damage or overheat-
ing, 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 spacing 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. 

16. Picture Tube Implosion Warning:

The picture tube in this receiver employs
“integral implosion” protection.  To ensure
continued implosion protection, make sure
that the replacement 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 picture tube by its neck.   Some 
“in-line” picture tubes are equipped with a 
permanently attached deflection yoke; do not
try to remove such “permanently 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 features and the protection they
give might be lost if the replacement compo-
nent differs from the original—even if the
replacement is rated for higher voltage,
wattage, etc.  

Components that are critical for safety are
indicated in the circuit diagram by shading,  
(      ) or (      ). 

Use replacement components that have the

same ratings, especially for flame resistance
and dielectric strength specifications. 
A replacement part that does not have the
same safety characteristics as the original
might create shock, fire or other hazards. 

Precautions

1-2

Samsung Electronics

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