文章简述了电视机场扫描电路的组成和工作原理，在此基础上分析了电视机场扫描电路的检修方法及其常见故障的维修，并给出了具体的维修实例。
This paper briefly states the composition of TV field scanning circuit and its working principles, on which the common breakdowns and how to repair are analyzed and some examples are given.
对SHW190焊机的常见故障进行了详细的分析，并讲述了具体的检修和维护方法。
The common failure of SHW190 series welding machine is analyzed in detail, also the troubleshooting and solutions is put.
介绍汽车电动风扇的控制原理和结构特点，分析一般常见故障的检修方法。
This paper introduces the control principles and the structural specialities of the auto electric fan and the inspection ways of its common faults.
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