Samsung 732N Service Manual

Also see for 732NPLUS: User manual User guide Service manual

1 Precautions1-21-2-1 General ServicingPrecautions1. Always unplug the unit’s AC power cord from the ACpower source and disconnect the DC Power Jack beforeattempting to:(a) remove or reinstall any component or assembly, (b)disconnect PCB plugs or connectors, (c) connect a testcomponent in parallel with an electrolytic capacitor.2. Some components are raised above the printed circuitboard for safety. An insulation tube or tape is sometimesused. The internal wiring is sometimes clamped toprevent contact with thermally hot components. Reinstallall such elements to their original position.3. After servicing, always check that the screws,components and wiring have been correctly reinstalled.Make sure that the area around the serviced part has notbeen damaged.1. Immediately before handling any semiconductorcomponents or assemblies, drain the electrostatic chargefrom your body by touching a known earth ground.Alternatively, wear a discharging wrist-strap device. Toavoid a shock hazard, be sure to remove the wrist strapbefore applying power to the monitor.2. After removing an ESD-equipped assembly, place it on aconductive surface such as aluminum foil to preventaccumulation of an electrostatic charge.3. Do not use freon-propelled chemicals. These cangenerate electrical charges sufficient to damage ESDs.4. Use only a grounded-tip soldering iron to solder ordesolder ESDs.5. Use only an anti-static solder removal device. Somesolder removal devices not classified as “anti-static” cangenerate electrical charges sufficient to damage ESDs.4. Check the insulation between the blades of the AC plugand accessible conductive parts (examples: metal panels,input terminals and earphone jacks).5. Insulation Checking Procedure: Disconnect the powercord from the AC source and turn the power switch ON.Connect an insulation resistance meter (500 V) to theblades of the AC plug.The insulation resistance between each blade of the ACplug and accessible conductive parts (see above) shouldbe greater than 1 megohm.6. Always connect a test instrument’s ground lead to theinstrument chassis ground before connecting the positivelead; always remove the instrument’s ground lead last.6. Do not remove a replacement ESD from its protectivepackage until you are ready to install it. Mostreplacement ESDs are packaged with leads that areelectrically shorted together by conductive foam,aluminum foil or other conductive materials.7. Immediately before removing the protective materialfrom the leads of a replacement ESD, touch theprotective material to the chassis or circuit assembly intowhich the device will be installed.Caution: Be sure no power is applied to thechassis or circuit and observe allother safety precautions.8. Minimize body motions when handling unpackagedreplacement ESDs. Motions such as brushing clothestogether, or lifting your foot from a carpeted floor cangenerate enough static electricity to damage an ESD.1-3 Electrostatically Sensitive Devices (ESD) PrecautionsSome semiconductor (solid state) devices can be easily damaged by static electricity. Such components are commonly calledElectrostatically Sensitive Devices (ESD). Examples of typical ESD are integrated circuits and some field-effect transistors. Thefollowing techniques will reduce the incidence of component damage caused by static electricity.1-2 Servicing PrecautionsWARNING: An electrolytic capacitor installed with the wrong polarity might explode.Caution: Before servicing units covered by this service manual, read and follow the Safety Precautions sectionof this manual.Note: If unforeseen circumstances create conflict between the following servicing precautions and any of the safetyprecautions, always follow the safety precautions.Downloaded from www.Manualslib.com manuals search engine