The working principle of colour TV supply source circuit and fault analysis were described. Some maintenance examples are helpful for repairing other switch supply source circuits.
介绍了彩显电源电路的基本原理及故障的分析和维修实例，对维修其它开关电源电路具有借鉴作用。
2
The paper introduces some examples of repairing mineral machinery parts with manual arc surfacing.
介绍了用手工电弧堆煌的方法修复一些矿山机械零件的实例。
3
This article introduces the failure situation, failure analysis, failure inspection and repairing on the basis of examples, also it illuminates the refitting for AC arc welding machines.