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维修家用电器等免不了要更换元器件。然而,如果所换上去的元器件存在质量问题,则将给维修者带来很大的麻烦。现举例说明。例1.一台三无37SYC—2型彩电,开机呈“三元”,但有“吱吱”声。检查发现行管(2SD869)“c—e”间已呈短路状态,从而引起了电源的保护。测主电源电压110V正常,查行输出级负载电路无明显短路现象,遂换上同型号行管,开机试验,声像均正常。熟料约一小时左右。故障重复出现,行管又被烧穿。行管再次损坏引起了笔者的重视,为慎重起见,换上行管后在其集电
Maintenance of household appliances will inevitably have to replace the components. However, if there is a quality problem with the components being replaced, it will be very troublesome for the maintenance person. Here is an example. Example 1. A three-color 37SYC-2 color TV, boot was “ternary”, but “creak” sound. Inspection found that the tube (2SD869) “c-e” has been a short circuit between the state, causing the power protection. Measure the main power supply voltage of 110V normal, check the output line load circuit no significant short-circuit phenomenon, then put on the same model line control, boot test, the sound image is normal. Clinker about an hour. Repeated failure occurred, the line was burned again. I am responsible for damage again caused the author’s attention, for the sake of caution, after the change in charge of its power