My team has a DR4B, and the top motors will go down but not up. Any advice?
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What do you mean by go down? Can you explain more completely? If you mean that your lift is unable to move up and can only move down, are you using rubber bands to offset the weight of your lift? If done right your motors shouldn’t have to lift your lift at all and will only really have to overcome it inertia.
It turns out it was just a bad cortex port. Sorry about that!