开机瞬间有高压、随即关机，测场块+V供电为8V，测场块高热，测限流电阻R420变大为1Ω，换场块STV9379，电阻R420后一切正常。（场块STV9379 ②脚为+12V，④脚为-12V；故障点：场块N401，电阻R420） |
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