Having depended on the analysis of case content characteristic and FTA (Fault Tree Analysis) characteristic, the paper propounded a method to express printing machine fault case, which is called four elements method based on FTA. Finally, the paper took an example to explain how to express fault case by the method. From the example we could found that this method had a good hiberarchy and easy maintenance, and for necessary of the printing machine fault diagnosis.
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机译：依靠案例内容特征和FTA（Fault Tree Analysis）特征的分析，提出了一种表达印刷机故障案例的方法，称为基于FTA的四要素法。最后，以一个实例来说明该方法如何表达故障案例。从示例中我们可以发现，该方法具有良好的层次结构，易于维护，对于打印机的故障诊断是必要的。
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