Hi To All,

I have had my CNC stored away for about a year and a half. I took it back out to continue working and found two axises not working. After doing all the testing of boards and circuitry, I came to the conclusion that new PIC16F628A were needed.

Here's the current scenario:

1. Of the 3 original chips, 1 still works. The other 2 dead.
2. When I put the working chip into the other motor drivers the drivers function as they should.
3. Purchased 3 new chips, burned them and verified the data.
4. Placed new chips into the drivers and they don't step properly.
5. Removed new chip from one driver and put the working old chip into driver, still works as it should.

I never seen anything like this in my life. Does anyone out there have a clue what's going on here or have another procedure to detect problem?

Thanks Crawford