Samsung CK3366ZR4X/BWT Service Manual

1. Some semiconductor (“solid state”) devicesare easily damaged by static electricity. Suchcomponents are called ElectrostaticallySensitive Devices (ESDs); examples includeintegrated circuits and some field-effecttransistors. The following techniques willreduce the occurrence of component damagecaused by static electricity.2. Immediately before handling any semiconductor components or assemblies, drain theelectrostatic charge from your body bytouching a known earth ground. Alternatively,wear a discharging wrist-strap device. (Besure to remove it prior to applying power—this is an electric shock precaution.)3. After removing an ESD-equipped assembly,place it on a conductive surface such asaluminum foil to prevent accumulation ofelectrostatic charge.4. Do not use freon-propelled chemicals. Thesecan generate electrical charges that damageESDs.5. Use only a grounded-tip soldering iron whensoldering or unsoldering ESDs.6. Use only an anti-static solder removal device.Many solder removal devices are not rated as“anti-static”; these can accumulate sufficientelectrical charge to damage ESDs.7. Do not remove a replacement ESD from itsprotective package until you are ready toinstall it. Most replacement ESDs arepackaged with leads that are electricallyshorted together by conductive foam,aluminum foil or other conductive materials.8. Immediately before removing the protectivematerial from the leads of a replacement ESD,touch the protective material to the chassis orcircuit assembly into which the device will beinstalled.9. Minimize body motions when handlingunpackaged replacement ESDs. Motions suchas brushing clothes together, or lifting a footfrom a carpeted floor can generate enoughstatic electricity to damage an ESD.Precautions1-4 Samsung Electronics1-3 Precautions for Electrostatically Sensitive Devices (ESDs)