own circuit board, power supply termination of a asm1117-5.0V chip , I would 9V, 1.5A power adapter plug is energized , the switch to "OFF" side, the measured power jack voltage of 9V, but will switch to the "ON" when the terminal voltage becomes 0V , do not know why , I hope to know the reasons for a favor , thank you !
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circuit board is shorted to ground (1.5A is not small, short-circuiting a serious fever ) , more likely to be a bad power adapter , no load capacity
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adapter is bad, profiteers · · · · · ·
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