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PCB板维修

手上有一块比例阀的PCB板,由于只有只一块不能完全将它破坏,所以只能在线测量,这是比例阀的图片及唯一的一点技术手册图片,具体故障是比例阀报警上电后发热严重,然后还有进气阀已打开但出气口未检测到压力,亲们支个招该怎么弄

 

下边是实物及PCB