Safety Precautions - Samsung CS21A530FL Service Manual

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 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 that no gaps exist between the cabinets for children to insert their fingers in to prevent children from receiving electric
shocks. Gaps mentioned above include ventilation holes of a too great magnitude between the vaccum tube and the cabinet
mask, and the improper installation of the rear cabinet.
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).
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.
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 earthed 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 earthed 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 regular ones immediately.
When any damage or overheating is detected, correct this immediately and make a regular check of possible errors.
Samsung Electronics
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LEAKAGE
(READING SHOULD
DEVICE
CURRENT
UNDER
TESTER
TEST
TEST ALL
EXPOSED METAL
SURFACES
2-WIRE CORD
ALSO TEST WITH
PLUG REVERSED
(USING AC ADAPTER
PLUG AS REQUIRED)
Precaution
NOT BE ABOVE
0.5mA)
EARTH
GROUND
1-1