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电路完全按着SLVA369A做的，目前24V输入，准备输出正负12V，但是现在正电压输出20V，负电压输出-4V，正负电源后端无负载，目前无从查起，焊接了两块，症状一样，谁遇到过类似问题，分享下经验，另求专家帮忙找下原因？
