Precaution.pdf part of Samsung Precaution Precaution.pdf, Samsung TV CS-29B850 Precaution.pdf text manual preview

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Precaution

1. Precaution
To avoid possible damages or electric shocks or exposure to radiation, follow the instructions below with regard to
safety,installation, service and ESD.

1-1 SafetyPrecautions
1. Make sure all protective devices are properly installed 5. Warning for Engineering Changes:
including non-metallic handles and compartment covers Never make any changes or additions to the circuit design
when installing or re-installing the chassis or chassis or the internal part for this product.
assemblies. Ex: Do not add any audio or video accessory connectors.
This might cause physical damage. Furthermore, any
2. Make sure that no gaps exist between the cabinets for changes or additions to the original design/engineering will
children to insert their fingers in to prevent children from invalidate the warranty.
receiving electric shocks. Gaps mentioned above include
ventilation holes of a too great magnitude between the 6. Warning - Hot Chassis:
vaccum tube and the cabinet mask, and the improper Some TV chassis are directly connected to one end of the
installation of the rear cabinet. AC power cord for electrical reasons.
Without insulated transformers, the product can only be
Errors may occur when the resistance is below 1.0 or repaired safely when the chassis is connected to the
over 5.2. In these cases, make sure that the device is earthed end of the AC power source.
repaired before sending it back to the customer.
To make sure the AC power cord is properly connected,
3. Check for Electricity Leakage (Fig. 1-1) follow the instructions below. Use the voltmeter to measure
the voltage between the chassis and the earthed ground. If
Warning: Do not use an insulated transformer for checking the measurement is over 1.0V, unplug the AC power cord
the leakage. Use only those current leakage testers or and change the polarity before re-inserting it. Measure the
mirroring systems that comply with ANSIC 101.1 and the voltage between the chassis and the ground again.
Underwriter Laboratory's specifications (UL1410, 59.7).
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
LEAKAGE (READING SHOULD
DEVICE CURRENT NOT BE ABOVE in the circuit using an unbreakable/unchangeable insulation
UNDER
TEST
TESTER 0.5mA) material.
TEST ALL
EXPOSED METAL 8. When any parts, material or wiring appear overheated or
SURFACES
damaged, replace them with new regular ones immediately.
2-WIRE CORD
When any damage or overheating is detected, correct this
ALSO TEST WITH immediately and make a regular check of possible errors.
PLUG REVERSED
(USING AC ADAPTER EARTH
PLUG AS REQUIRED) GROUND 9. Check for the original shape of the lead, especially that of
Fig. 1-1 AC Leakage Test the antenna wiring, any sharp edges, the AC power and
the high voltage power. Carefully check if the wiring is too
4. A high voltage is maintained within the specified limits using tight, incorrectly placed or loose. Never change the space
safety parts, calibration and tolerances. When voltage between the part and the printed circuit board. Check the
exceeds the specified limits, check each special part. AC power cord for possible damages. Keep the part or the
lead away from any heat-emitting materials.

Samsung Electronics 1-1
Precaution

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 bracketed 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.

1-2 Samsung Electronics
Precaution

1-2 ServicingPrecautions
Warning 1: First carefully read the "Safety Instruction" in this service manual.
When there is a conflict between the service and the safety instructions, follow the safety instruction at all times.

Warning 2: Any electrolytic capacitor with the wrong polarity will explode.

1. The service instructions are printed on the cabinet, and 7. Any B+ interlock should not be damaged.
should be followed by any service personnel. If the metal heat sink is not properly installed, no connection
to the AC power should be made.
2. Make sure to unplug the AC power cord from the power
source before starting any repairs. 8. Make sure the grounding lead of the tester is connected to
(a) Remove or re-install parts or assemblies. the chassis ground before connecting to the positive lead.
(b) Disconnect the electric plug or connector, if any. The ground lead of the tester should be removed last.
(c) Connect the test part in parallel with the electrolytic
capacitor. 9. Beware of risks of any current leakage coming into contact
with the high-capacity capacitor.
3. Some parts are placed at a higher position than the printed
board. Insulated tubes or tapes are used for this purpose. 10. The sharp edges of the metal material may cause physical
The internal wiring is clamped using buckles to avoid damage, so protect yourself by wearing gloves during the
contact with heat emitting parts. These parts are installed repair.
back to their original position.

4. After the repair, make sure to check if the screws, parts
or cables are properly installed. Make sure no damage is
caused to the repaired part and its surroundings.

5. Check for insulation between the blade of the AC plug and
that of any conductive materials (i.e. the metal panel, input
terminal, earphone jack, etc).

6. Insulation Check Process: Unplug the power cord from the
AC source and turn the switch on. Connect the insulating
resistance meter (500v) to the AC plug blade.

The insulating resistance between the blade of the AC plug
and that of the conductive material should be more than 1
.

Samsung Electronics 1-3
Precaution

1-3 StaticElectricityPrecautions
1. Some semi-conductive ("solid state") devices are vulnerable 5. Use only grounded-tip irons for soldering purposes.
to static electricity. These devices are known as ESD. ESD
includes the integrated circuit and the field effect transistor. 6. Use only anti-static solder removal devices.
To avoid any materials damage from electrostatic shock, Most solder removal devices do not support an anti-static
follow the instructions described below. feature. A solder removal device without an anti-static
feature can store enough static electricity to cause damage
2. Remove any static electricity from your body by connecting to the ESD.
the earth ground before handling any semi-conductive parts
or assemblies. Alternatively, wear a dischargeable wrist- 7. Do not remove the ESD from the protective box until the
belt. replacement is ready. Most ESD replacements are covered
(Make sure to remove any static electricity before with lead, which will cause a short to the entire unit due
connecting the power source - this is a safety instruction for to the conductive foam, aluminum foil or other conductive
avoiding electric shock) materials.

3. Remove the ESD assembly and place it on a conductive 8. Remove the protective material from the ESD replacement
surface such as aluminum foil to prevent accumulating lead immediately after connecting it to the chassis or circuit
static electricity. assembly.

4. Do not use any Freon-based chemicals. Such chemicals 9. Take extreme caution in handling any uncovered ESD
will generate static electricity that causes damage to the replacements. Actions such as brushing clothes or lifting
ESD. your leg from the carpet floor can generate enough static
electricity to damage the ESD.

CAUTION

These servicing instructions are for use by qualified
service personnel only.
To reduce the risk of electric shock do not perform any
servicing other than that contained in the operating
instructions unless you are qualified to do so.

1-4 Samsung Electronics
Precaution

1-4 InstallationPrecautions
1. For safety reasons, more than two people are required for 6. Keep the antenna far away from any high-voltage cables
carrying the product. and install it firmly. Contact with the high-voltage cable or
the antenna falling over may cause fire or electric shock.
2. Keep the power cord away from any heat emitting devices,
as a melted covering may cause fire or electric shock. 7. Check the basics of the screen test.antenna for areas with
no DTV signal.
3. Do not place the product in areas with poor ventilation -Image position/size, Tilt adjustment
such as a bookshelf or closet. The increased internal
temperature may cause fire.

4. Bend the external antenna cable when connecting it to the
product. This is a measure to protect it from being exposed
to moisture. Otherwise, it may cause a fire or electric shock.

5. Make sure to turn the power off and unplug the power cord
from the outlet before repositioning the product. Also check
the antenna cable or the external connectors if they are fully
unplugged. Damage to the cord may cause fire or electric
shock.

Samsung Electronics 1-5
MEMO

1-6 Samsung Electronics