I have a problem with my Extruder Board from tech Zone, it's able to drive the Extruder Stepper when the Heater is off and when the heater just starts up, but as soon as the heater reaches a high temperature (around 150). The Stepper just hums and there is no movement, just LEDs blinking. I tried changing the speed and pwm, setting the pwm using M113 and letting the board control it, to no avail. I also implemented some of the changes suggested in the Tech Zone electronics wiki (linking the ground the mother board and the extruder board). The A3949 on the extruder board does not seem to be overheating either.
Any suggestions would be appreciated.
Thanks
Tayeb