Ive just replaced my drive board with the TB6560 board and i'm getting some stepper motor hum and squeal when the motors are at idle.I'd like to make sure of the voltage at the board but not sure where or if there are any check points .I had a mechatronics 3 axis board which i really liked and was so easy to check and adjust for each axis, but it burned out a few weeks ago.If it is not a voltage problem might it be something else? i have tryed different dip settings but no luck. Thanks by the way the machine is a 3 axis routing maching.