Whats wrong?

peirof

Hi,

The answers:

What revision Duet is it? It's written on the top of the PCB, probably 1.03 if it is a recent purchase.

Duet 2 v1.03

After you send the G91 followed by the G1 S2 X10 command, are there any messages on the GCode Console tab of DWC?

None

After you send those commands, does the stepper motor lock and become difficult to move by hand, or is it still easy to move by hand? (Only move the carriages slowly by hand).

They move smooth

Please confirm that you have nothing connected to the Duet expansion connector.

Confirmed, i have nothing connected

dc42

Are you able to measure the voltage between the ENN pin of the expansion connector and ground? It should be +3.3V with just USB power provided, and fall to 0V shortly after VIN power is applied.

There is another thread about a similar problem at https://forum.duet3d.com/topic/5956/webcontrol-usb-connecting-leds-light-up-but-motors-not-turning/8.

peirof

Hi,

Measure voltage with USB connected. NO?

With steppers of, i have to read aprox 3.3V
With steppers moving, i have to read 0.0V

Correct?

Pins to check

link to Pins to check

peirof

Hi...

i have measure, and have 2.926V....

There is some system of check steppers drivers???

dc42

@peirof said in Whats wrong?:

Hi,

Measure voltage with USB connected. NO?

With steppers of, i have to read aprox 3.3V
With steppers moving, i have to read 0.0V

Correct?

link to Pins to check

Those are the correct pins to check. With USB power only supplied, you should get 3.3V between them. When you apply VIN power, it should drop to 0V.

peirof

hi,

i have do....

1- With Usb only power..... V=1.72
2- If i power on..... V=2.92
3- If i power off.... Voltage drops slow until 1.72

dc42

Those figures are not right. I think we need to exchange your Duet and examine it to see what is wrong.

peirof

can you give me instructions?

dc42

If you bought it from Duet3d then please complete the form at https://docs.google.com/forms/d/e/1FAIpQLSdyf6gGP_ncZachWi2HH7qx1kc5TE9WeEbz83VFBckm1JBXbQ/viewform. Otherwise, contact whoever you bought it from.

dc42

Hi @peirof, I've just experienced a very similar fault on one of my bench test systems. So I suspect a firmware issue. I am investigating it now.

dc42

@dc42 said in Whats wrong?:

Hi @peirof, I've just experienced a very similar fault on one of my bench test systems. So I suspect a firmware issue. I am investigating it now.

Hmm, I can't reproduce the problem since I reset the board. But i definitely had a similar issue: firmware thinking that everything was normal, but motors not turning.