Originally Posted by randyf1965 Argh! I give up!!!!!
I reflowed some solder joints that didn't look good.... now it doesn't work. seeing the same resistance readings as my other 2 boards!!!
example gnd to R5 was 10k now 3 meg
I can trace the 5volt and 12 (my stepper voltage) around the board but haven't had time to sit down and theoritically figure voltage drops, etc .
Anyone have this circuit in a simulator that could be used to produce test points for a given voltage?
I have checked for shorts and traced out the board. without a known good board to get readings off I don't know how the lm18245 and the pic react to taking resistance readings
Are the LM18245's very susceptible to static damage in circuit?
Pic's are 16f628a's and I have tried 3 different motors... same buzzing |
try altering the tuning of the motors in mach2 , if using the jog function in cont mode , by pressing the direction key the motor moves one step each time you press in the same direction then your motors are correct , however
stepper motors need to be tuned to get the best step rate you may be , this is just trial and error but try first of all lowering the speed right down , then if all is ok , bring the slider up bit by bit untill the motor shudders , you then have passed the optimun point , so just bring it back down untill it runs again
i would check the pcb resistance readings without the pic in place
it's much easier .
if you have MSN etc perhaps we can talk you through checking it
although i am in the UK
Dave