Mega 2560 + ramps 1.4 + tb6600 + grbl = false. Pls help!

Hi all pro,

I am new in CNC. I have connected mega + ramps + tb6600 as enclosed photo.

I used grbl 1.1 mega 2560 version, selected the right port (COM 3), the right board (mega 2550) in Arduino IDE. Uploading firmware was ok.

But when I tried to test it by using Universal GCode Sender manually, but the motor didn't spin

Did I miss out something. Pls helpppppp



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