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从故障诊断的角度分析印刷电路板的原理图，建立了电路板的诊断信息流模型。模型反映了试验之间及试验与故障之间的观察关系。基于该模型讨论了印刷电路板的故障诊断问题，实例说明了模型的有效性。同时该模型具有一定的处理多故障的能力。
From the perspective of fault diagnosis PCB schematic diagram, the establishment of a circuit board diagnostic information flow model. The model reflects the observed relationship between tests and between tests and failures. Based on the model, the fault diagnosis of printed circuit board is discussed. The example shows the validity of the model. At the same time the model has a certain ability to deal with multiple faults.