Sine the arms are working, we know the EZ-B v4 is working, so it is something with the H-Bridge. Since you confirmed the wiring to the V4, I think you should open the chassis of your roli and check the cabling on the H-Bridge.

Instructionsn for opening the Roli are here https://synthiam.com/Tutorials/Lesson/47 in the fuze replacement lesson.

The other thing to check is that the +5v regulator button is depressed. I could see that leaving that up could be a simple mistake that could be made in manufacturing.

Take pictures of the connections inside so we can confirm the wiring (note: although the power connections were correct on mine, the wiring harness for the motors and pwm was exactly backwards, so we do know there have been some assembly errors).

See this H-bridge tutorial of Rich's for information about proper wiring of this H-bridge: https://synthiam.com/Community/Questions/4096

Alan

it seems to be wired correctly and the button is depressed.

Hmm there may be a wiring issue. in my picture the green lead is on the left and the black and white leads on the right - should it be switched?

Can you take a closer photo of the H-Bridge connections?

i will start my own thread as to not hijack @stephenhoey

same issue, but with smoke...

Here it is - sorry for the poor quality on the first one.

Doube check the connections are as follows;

Black is on ENA (extreme left on back row of pins) Green is on ENB (extreme right on the back row of pins) White is on In1 (extreme left on front row of pins) Grey is on In2 (Second pin from left on front row of pins) Purple is on In3 (Third pin from left on front row of pins) Blue is on In4 (extreme right on front row of pins)

They mis-wired the power connector. The red power wire should be in VCC not +5. The little switch (s1) should be in the down position.

Everything else appears to be correct.

Here is mine, which works. Note, my control harness is wired backwards, so I fixed it on the EZ-B rather than the H-Bridge, but the power on mine is correct.

Alan