Sorry, we'd not be sure what would have happened. If a Futaba servo is working correctly, and other Futaba servos work correctly, then the receiver may not be at fault. If the speed control is a Futaba unit, then we'd consider it necessary to check both the speed control and the receiver. If only non-Futaba equipment has a problem, then there may be nothing wrong at all.

Without a comprehensive checkup, we really can't give you a positive answer.