Samsung AQ07A1VE Service Manual

Also see for AQ07A1VE: Installation manual Owner's instructions Service manual

Contents

Samsung Electronics 5-75-3 PCB Inspection5-3-1 Cautions for Part Replacement5-3-2 ProcedureThe parts should be replaced in the following procedure.1. The human body carries much staticelectricity. Before touching a part for repair,replacement or the similar purpose, be sureto touch a grounded metallic portion byhand to let the static electricity go throughthe matallic portion to the earth.Espectially when handling any microcomputer or IC, carefully remove such staticelectricity before touching them.2. When repairing any part on a work bench,be sure to place an insulative sheet on thebench and always keep the sheet surfaceneat without any metal fragments. If anysuch fragment touches a part, a secondarytrouble will possibly be caused in the part.3. Before replacing any parts, be sure to turnoff the power supply. If such replacement isdone with the power supply kept on, anelectric shock, short circuit or destruction ofa part may result.4. During replacement or repair of a part,carefully handle it : The printed circuitboard has fine lead wires (jumper wires) andglass-made parts (diode) on its substrate.So if a circuit board is roughly handled, suchlead wires and parts will be easily broken ordamaged by bending or shock.5. When soldering the lead wires of any newpart, be sure to polish them using an emerypaper or the like before solding them.Since the lead wires of any new part arecovered with an oxide film, solder cannotadhere to the lead wires if not polished.6. When soldering any part, care should beexercised not to apply any high-wattagesoldering iron to the part for a long time.Some parts are of so low a heat resistancethat they may be broken or have theproperties changed if a soldering iron is soapplied (Otherwise, the pattern maypossibly be separated and raised).7. The heat of the soldering iron should betransfered to the entire object to be soldered.If the solder pieces are not well fused due toinsufficient transfer of the heat from thesoldering iron, no satisfactory electricalcontinuity can be assured even if thesoldered objects appear well connected toeach other.8. The solder used should be limited to aminimum. If excessive solder is used, it willcause inter-pattern contact, which maycause malfunction of the circuit.The repair is completed.Check the operation of the new part.Replace it with a new part.Detach the faulty part.Check for any faulty part.