Hi. Charlie. Thanks for that. I'll give that a go. The 6090 machine is a Stepmores. It's a Serial port connection. When fired up from cold if looking at the Breakout board the green strip leds light in sequence depending which axis you're moving. Within under a minute some of those leds dim and the X and Z axis is very rough if moving at all Y axis still smooth, so I'm assuming that the board has the issue.... Regards Ronnie.