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danieljack
I remember I tried moving the motor by hand slowly while it's powered on, and I believe I was able to move it.
I didn't measured the voltage on the motors, just the ohms.
When powered on, it should be very difficult to turn a stepper motor.
When I suggested checking voltage, I meant the outputs from the stepper driver. When powered on and not moving, you should see +12V across at least one pair of wires to the motor.
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And something else I remembered now, I tested last night with all the drivers in (4) and 3 stepper motors..the ramps and the LCD didn't turned on, but after I removed 2 drivers and 1 stepper, the ramps and arduino worked fine :/. Maybe when I fried my Arduino voltage regulator, one of the drivers died as well. How should I check each driver if they are still good, or what was the problem causing the board not to turn on ?
Sounds like the power supply isn't coping, which seems unlikely for a 550W supply. Maybe there's a dead short? Or a failed power transistor?
Sorry, this is about the limit of my electronic knowledge. Hopefully someone more knowledgeable will step in with more advice.
Frank