Precaution; Safety Precautions - Samsung PS43D490A1XZN Service Manual

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 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 PDP
module and the cabinet mask, and the improper installation of the rear cabinet.
Errors may occur when the resistance is below 1.0MΩ or over 5.2MΩ. In these cases, make sure that the device is
repaired before sending it back to the customer.
3) Check for Electricity Leakage (AC Leakage Test)
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).
DEVICE
UNDER
TEST
TES T ALL
EXPOSED ME TAL
SUR FACES
2-WIRE CORD
ALSO TES T WITH
PLUG REVERSED
(US ING AC
ADAPTER PLUG
AS REQU IRED)
Figure 1.1 AC Leakage Test
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 reinserting it. Measure the voltage between the chassis and the ground again.
Copyright© 1995-2011 SAMSUNG. All rights reserved.
LEAKAGE ( R E A D I N G
CURREN T
SHOULD NOT BE
TESTER
ABOVE 0.5mA)
EARTH
GROUND
1. Precaution
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