Samsung MH026FPEA Training Manual

Also see for MH026FKEA: User manual User manual Installation manual Service manual Service manual

103Samsung Electronics8-4 PCB Inspection8-4-1 Cautions for Part Replacement8-4-2 ProcedureThe parts should be replaced in the following procedure.1. The human body carries much static electricity. Beforetouching a part for repair, replacement or the similarpurpose, be sure to touch a grounded metallic portion byhand to let the static electricity go through the metallicportion to the earth.Especially when handling any micro computer or IC,carefully remove such static electricity before touchingthem.2. When repairing any part on a work bench, be sure toplace an insulative sheet on the bench and always keepthe sheet surface neat without any metal fragments.If any such fragment touches a part, a secondary troublewill possibly be caused in the part.3. Before replacing any parts, be sure to turn off the powersupply. If such replacement is done with the power supplykept on, an electric shock, short circuit or destruction of apart may result.4. During replacement or repair of a part, carefully handle it: The printed circuit board has fine lead wires (jumperwires) and glass-made parts (diode) on its substrate.So if a circuit board is roughly handled, such lead wiresand parts will be easily broken or damaged by bendingor shock.5. When soldering the lead wires of any new part, be sureto polish them using an emery paper or the like beforesoldering them.Since the lead wires of any new part are covered with anoxide film, solder cannot adhere to the lead wires if notpolished.6. When soldering any part, care should be exercised not toapply any high-wattage soldering iron to the part for along time. Some parts are of so low a heat resistancethat they may be broken or have the properties changedif a soldering iron is so applied (Otherwise, the patternmay possibly be separated and raised).7. The heat of the soldering iron should be transferred tothe entire object to be soldered. If the solder pieces arenot well fused due to insufficient transfer of the heat fromthe soldering iron, no satisfactory electrical continuity canbe assured even if the soldered objects appear wellconnected to each other.8. The solder used should be limited to a minimum.If excessive solder is used, it will cause inter-patterncontact, which may cause 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.