Samsung HT-X250 Service Manual

Also see for HT-X250: Firmware update guide Instruction manual Instruction manual Instruction manual Service manual

Samsung Electronics1-21-1 Safety Precautions (Continued)7. Components, parts and wiring that appearto have overheated or that are otherwisedamaged should be replaced with partsthat meet the original specifications.Always determine the cause of damage oroverheating, and correct any potentialhazards8. Observe the original lead dress, especiallynear the following areas: Antennawiring, sharp edges, and especially theAC and high voltage power supplies.Always inspect for pinched, out-of-place,or frayed wiring. Do not change thespacing between components and theprinted circuit board. Check the ACpower cord for damage. Make sure thatno wires or components touch thermallyhot parts.9. Product Safety Notice:Some electrical and mechanical partshave special safety-related characteristicswhich might not be obvious from visualinspection. These safety features and theprotection they give might be lost if thereplacement component differs from theoriginal--even if the replacement is ratedfor higher voltage, wattage, etc.10 Components that are critical for safety areindicated in the circuit diagram byshading, or . Use replacementcomponents that have the same ratings,especially for flame resistance anddielectric strength specifications. Areplacement part that does not have thesame safety characteristics as the originalmight create shock, fire or other hazards.1-2 Servicing Precautions1. Servicing precautions are printed on thecabinet. Follow them.2. Always unplug the unit's AC power cordfrom the AC power source beforeattempting to: (a) Remove or reinstall anycomponent or assembly, (b) Disconnect anelectrical plug or connector, (c) Connect atest component in parallel with anelectrolytic capacitor.3. Some components are raised above theprinted circuit board for safety. Aninsulation tube or tape is sometimes used.The internal wiring may be clamped toprevent contact with thermally hotcomponents. Reinstall all such elements totheir original position.4. After servicing, always check that thescrews, components and wiring have beencorrectly reinstalled. Make sure that theportion around the serviced part has notbeen damaged.5. Check the insulation between the blades ofthe AC plug and accessible conductive parts(examples: metal panels, input terminalsand earphone jacks).6. Insulation Checking Procedure: Disconnectthe power cord from the AC source andturn the power switch ON. Connect aninsulation resistance meter (500V) to theblades of the AC plug.The insulation resistance between eachblade of the AC plug and accessibleconductive parts (see above) should begreater than 1 megohm.7. Never defeat any of the B+ voltageinterlocks. Do not apply AC power to theunit (or any of its assemblies) unless allsolid-state heat sinks are correctly installed.8. Always connect a test instrument's groundlead to the instrument chassis groundbefore connecting the positive lead; alwaysremove the instrument's ground lead last.PrecautionsWarning1: First read the "Safety Precautions" section of this manual. If some unforeseen circumstance creates a conflictbetween the servicing and safety precautions, always follow the safety precautions.