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1. Precaution
To avoid possible damage, electric shocks or exposure to radiation, follow the instructions below with regard to safety,
installation, service and ESD.
1-1 Safety Precautions
1. Make sure all protective devices are properly installed
including non-metallic handles and compartment covers
when installing or re-installing the chassis or chassis
assemblies.
2. Make sure there aren't any gaps between the front and
rear cover that anyone could insert they're fingers into
and receive any electrical shock. These gaps include
ventilation holes, cracks, etc.
Errors may occur when the resistance is below 1.0 ㏁ or
over 5.2 ㏁. In these cases, make sure that the device
is repaired before sending it back to the customer.
3. Check for Electricity Leakage (Figure 1-1)
Warning: Do not use an insulated transformer for
checking the leakage. Use only those current leakage
testers or mirroring systems that comply with ANSIC
101.1 and the Underwriter Laboratory's specifications
(UL1410, 59.7).
Fig. 1-1 AC Leakage Test
DEVICE
UNDER
TEST
TEST ALL
EXPOSED METAL
SURFACES
2-WIRE CORD
ALSO TEST WITH
PLUG REVERSED
(USING AC ADAPTER
PLUG AS REQUIRED)
4. A high voltage is maintained within the specified limits
using safety parts, calibration and tolerances. When
voltage exceeds the specified limits, check each special
part.
5. Warning for Engineering Changes:
Never make any changes or additions to the circuit
design or the internal part for this product.
Ex: Do not add any audio or video accessory
connectors. This might cause physical damage.
Furthermore, any changes or additions to the original
design/engineering will invalidate the warranty.
Samsung Electronics
(READING SHOULD
NOT BE ABOVE
LEAKAGE
0.5mA)
CURRENT
TESTER
EARTH
GROUND
6. Warning - Hot Chassis:
Some TV chassis are directly connected to one end of
the AC power cord for electrical reasons. Without
insulated transformers, the product can only be repaired
safely when the chassis is connected to the earth end of
the AC power source.
To make sure the AC power cord is properly connected,
follow the instructions below. Use the voltmeter to
measure the voltage between the chassis and the earth
ground. If the measurement is over 1.0V, unplug the AC
power cord and change the polarity before re-inserting it.
Measure the voltage between the chassis and the
ground again.
7. Some TV chassis are shipped with an additional
secondary grounding system. The secondary system is
adjacent to the AC power line. These two grounding
systems are separated in the circuit using an
unbreakable/unchangeable insulation material.
8. When any parts, material or wiring appear overheated or
damaged, replace them with new immediately. When
any damage or overheating is detected, correct this
immediately and make a regular check of possible
errors.
9. Check for the original shape of the lead, especially that
of the antenna wiring, any sharp edges, the AC power
and the high voltage power. Carefully check if the wiring
is too tight, incorrectly placed or loose. Never change the
space between the part and the printed circuit board.
Check the AC power cord for possible damages.
Keep the part or the lead away from any heat-emitting
materials.
10. Safety Indication:
Some electrical circuits or device related materials
require special attention to their safety features, which
cannot be viewed by the naked eye. If an original part is
replaced with another irregular one, the safety or
protective features will be lost even if the new one has a
higher voltage or more watts.
Critical safety parts should be marked with (
Use only regular parts for replacements (in particular,
flame resistance and dielectric strength specifications).
Irregular parts or materials may cause electric shock or
fire.
Precaution
).
!
1-1
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