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时好时坏电气故障的分析
各种时好时坏电气故障从概率大小来讲大概包括以下几种情况：
1.接触不良
板卡与插槽接触不良、缆线内部折断时通时不通、线插头及接线端子接触不好、元器件虚焊等皆属
此类;
2.信号受干扰
对数字电路而言，在特定的情况条件下，故障才会呈现，有可能确实是干扰太大影响了控制系统使
其出错，也有电路板个别元件参数或整体表现参数出现了变化，使抗干扰能力趋向临界点，从而出
现故障;
3.元器件热稳定性不好
从大量的维修实践来看，其中首推电解电容的热稳定性不好，其次是其它电容、三极管、二极管、
IC、电阻等;
4.电路板上有湿气、积尘等。
湿气和积尘会导电，具有电阻效应，而且在热胀冷缩的过程中阻值还会变化，这个电阻值会同其它
元件有并联效果，这个效果比较强时就会改变电路参数，使故障发生;
5.软件也是考虑因素之一
电路中许多参数使用软件来调整，某些参数的裕量调得太低，处于临界范围，当机器运行工况符合
软件判定故障的理由时，那么报警就会出现。
八、怎样快速查找元器件资料
现代的电子产品五花八门，元器件种类日益繁多，何止万千，在电路维修中，尤其工业电路板维修
领域，许多元器件乃见所未见，甚或闻所未闻，另外即使某款板子手头的元器件的资料齐全，但要
在电脑里将这些资料一一翻阅分析，倘没有一个快捷查寻之法，则维修效率就要大打折扣，工业电
子维修领域，效率就是金钱，跟效率过不去就是跟口袋的钞票过不去。
我们该当庆幸生在这个伟大的时代，互联网的弗远*，令世界每一处角落似乎都伸手可及，免费
的资讯无处不在，人人尽可伸手，无甚欢迎。所以大家一定好好利用互联网这个强大的工具会让你
更加轻松！
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