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Where should I connect the 2016 cathode contact?


jeong won lee
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Hi. I'm a user living in South Korea.20220209_183606.thumb.jpg.53dd2b03d71cfa6931746198c2c0370b.jpg

The RPM suddenly became unstable.
I changed the 9v battery to a new one, but it just says that the battery is weak and it doesn't start.
If I connect the external power, the engine will start. The RFM is unstable.
If you turn off the external power, the engine will turn off.
It's because of the negative electrode. Is it because of this?
I don't remember where the cathode paper was.
I'd like to know where to connect.

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