论文部分内容阅读
“软”故障就是时有时无,反反复复的故障现象。维修时,想找故障原因时,故障现象没了;等你不修了,故障又出现,常使人感到头痛。其情形大致可分为三种:一是因振动故障反复;二是因工作时间延长而故障出现,冷机一段时间后开机又正常,工作一段时间后故障重现;三是故障随机出现,变化无规律。第一种情形的原因是:焊点松脱或虚焊、插件松动,元件引脚折断或因氧化而锈断,印刷板断裂,可变电阻及转换开关接触不良等。可人为地振动怀疑部分或轻轻拨动可疑元件及连线,同时观察故障现象有无变化,确定故障点。
“Soft” fault is sometimes no, repeatedly failure phenomenon. Maintenance, looking for the cause of the malfunction, the failure of the phenomenon; waiting for you not to repair, the fault appeared again, often make people feel a headache. The situation can be roughly divided into three types: First, because of repeated vibration failure; Second, due to prolonged working hours and failure, the cold machine after a period of boot and normal, after a period of time to reproduce the fault; Third, the random failure, changes Irregular. The first case is due to: solder joints loose or Weld, loose plug, component pins broken or due to oxidation and rust, broken printing plate, variable resistance and switch poor contact. Can be artificial vibration suspicious part or gently dial suspicious components and connections, while observing the phenomenon of any change in failure to determine the point of failure.