User manual Samsung HPT4254X/XAA

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Precaution  
1. Precaution  
To avoid possible damage or electric shocks or exposure to radiation, follow the instructions below with regard to safety, instal-  
lation, 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.  
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.  
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 between the PDP module and the cabi-  
net mask, and the improper installation of the rear cabi-  
net.  
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.  
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.  
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.  
3.  
Check for Electricity Leakage (Figure 1-1)  
Warning: Do not use an insulated transformer for check-  
ing 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).  
7.  
Some TV chassis are shipped with an additional sec-  
ondary grounding system. The secondary system is  
adjacent to the AC power line. These two grounding  
systems are separated in the circuit using an unbreak-  
able/unchangeable insulation material.  
(
READING SHOULD  
NOT BE ABOVE  
0.5mA)  
LEAKAGE  
CURRENT  
TESTER  
DEVICE  
UNDER  
TEST  
TEST ALL  
EXPOSED METAL  
SURFACES  
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.  
2
-WIRE CORD  
ALSO TEST WITH  
PLUG REVERSED  
USING AC ADAPTER  
(
EARTH  
GROUND  
PLUG AS REQUIRED)  
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.  
Fig. 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.  
Samsung Electronics  
1-1  

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