newbe help. just loaded mach3 I did the driver test it was Ok.set all the parameters. went to tune the motors. the arrow keys change the dros for the correct axis but the steppers wont run . I lowered the speed that didn't help. I took a voltmeter measured between pins 2-18,19 20 21 22 23 I read 3.3 volts is that to low? Why didn't that change when I pressed different arrow keys