Help! Steppers losing steps and making a racket under slow feed..

[fasteddy]

Thanks John..

Best idea yet, have been eying up the board with my most suspicious glare and wondering how to check it... Just need to figure out which is step and dir on the driver connections..

Steve..

[John S]

On which driver, the step3 or the 752 ?
If you get it wrong you won't blow one, it will just do one step everytime you change direction.