Help with Problem X axis Stepper Please

[howser37]

Thanks Graeme, i will see if i can find the data sheet online.

I would say both chips have definately failed, the black plastic has popped in both cases and in the case of this particular chip i opened up the contol box fairly quickly and the place where it had popped was still melted and gooey. But like you say whether this failure resulted in blowing the track or wwhether the track blew as a result is a different matter. I will admit i was not particularly thorough last time i replaced the chip in checking the back of the pcb, i just tested the socket pins were gripping ok and only quickly scanned the back so it is possible that this crack was there prior to replacing the chip.

This failure did take out an 8 amp slow blow fuse on the power supply too