suzonka

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I have tried to adjust my 420 charger with this you tube video , I don't know if turning the pots to the left or right will decrease the out put voltage to one of the cells on a #3S 2200 lipo
I have tried to monitor the voltage with a digital meter and I still can not see any adjustment change, can any one help me .thank you please see this video..

https://www.youtube.com/watch?v=t9Xk16HVhZA