Nah, turns out he had a duff servo AND sensor wire.
Thought it was odd as the output from the ESC for fan and RX is likely only 5-6v and a low amperage - and unlikely to work at all if connected reverse polarity - suppose the fan might run backwards, but the RX wire would simply not work as the signal and -ve are reversed.
Seen my nephew do this dozens of times after using his programming card.
"Uncle Julian, it's not working again..."
;-)
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Joo's Paint Kingmax Servos Optipower Yokomo
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