eq3-2 controller

[guodong]

Changed all the transistors and finally repaired

[bojan]

This looks like one of the motor coils or cable for motor are at fault ( I am assuming the motor is stepper).

[guodong]

Thanks, bojan

It's a stepper motor. The motor coils looks ok. The way I burnt was: I turn on the power to controller before plugging in the cable to motor. Do you have any suggestion? Probably have to change the transistors. Still trying to solve it today

Cheers
Gordon

Originally Posted by bojan

This looks like one of the motor coils or cable for motor are at fault ( I am assuming the motor is stepper).

[bojan]

Yes, you should try to change the transistors, however they are supposed to be protected from voltage spikes like that generated by plugging/unplugging cables by diodes (next to transistors)... Is anything on the board too hot? (careful, you may burn your fingertips!)
How about cable?

Originally Posted by guodong

Thanks, bojan

It's a stepper motor. The motor coils looks ok. The way I burnt was: I turn on the power to controller before plugging in the cable to motor. Do you have any suggestion? Probably have to change the transistors. Still trying to solve it today

Cheers
Gordon