I had a short circuit by accident so the LM7805 blow up letting the 12 volt through.
I changed the faulty LM7805 but the Steppers still don`t work so there is something else faulty.
I still can connect to the board with printrun and read the heater temperature.
One of the four pololu`s is getting very hot as soon as i connect the 12V. (dead i think)
Another pololu does have 0,0V on the Vref (also dead i think)
The two pololu`s left do have normal Vref and don`t get very hot.
Is there a guide available how to test a pololu (by voltage or resistor value) and to test where on the sanguino (1.3a) the problem is ?
mfg Chri