Desolder all three motors wires from the speed controller board.

Follow our soldering guide to learn how, or just to brush-up on your skills.

Be careful not to melt the plastic case bottom shell with your soldering iron or damage any electronic components.

When you're reassembling, solder the motor leads back in their original order. This may be different from the picture. Motors on arms across from each other have the same color order, so check the opposite arm for reference.