The original joypad is not working

After connect the extra joystick to expansion slot ,the original p1 joypad is not working , the original p1 controller change to the joystick connect to expansion slot. After I reset the famicom ,the original p1 joypad still not working, how can i fix it?

이 질문에 답하세요 저도 같은 문제를 겪고 있습니다

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