Please kind Duet people, repair Duet 3 board

chrishornby

The Duet 3 is a great board so simple to set up and use but today mine stopped working. No 5v and no 3.3v for no apparent reason. I contacted E3D where I got it from and they said to post here. Well on closer inspection I found that a tiny nut had landed on the board and I didn't see it so I don't know how long it had been there but eventually it appears to have done its work and the board no longer functions. So this is a plea to Duet to please tell me where to send the board and to repair it. I freely admit that there is no manufacturer fault and it is entirely because to my carelessness. No magic smoke so I don't think the fault is too severe. So not a guarantee claim.

A Former User

Where are you based?

Also if you upload some pictures of the board we might help you diagnose the issue,

It could also be worth trying to power the Duet from USB to see if it works (that will confirm the 3.3v regulator is ok at least, and that you could probably buy an external 5v source instead of repairing the board which may take some time with lockdowns etc)

edit: if it works from USB then another option is to get a Raspberry Pi and change the jumpers to power the Duet from the Pi. Unless you have lots of 5v sensors/fans/etc that'll probably work just fine

chrishornby

Hi
I am based in Portland Dorset. The board works fine when connected to a USB power supply.

The Pi does not power the board. If I change the link from 5v>SBC to SBC>5v and power the pi, it doesn't power the board. I can't find the DUET 3 specific instructions for this in the documentation so maybe I am doing it wrong.

When I connect the 24v Vin, all LEDs flash rapidly, whether the USB power is connected or not.

Surely the Board is not going to be able to supply enough current to the steppers if I just power it with the 5v. Doesn't it need the Vin supply too?

powered by USB.JPG

droftarts

@chrishornby said in Please kind Duet people, repair Duet 3 board:

The Pi does not power the board. If I change the link from 5v>SBC to SBC>5v and power the pi, it doesn't power the board. I can't find the DUET 3 specific instructions for this in the documentation so maybe I am doing it wrong.

See https://duet3d.dozuki.com/Wiki/Duet_3_Mainboard_6HC_Hardware_Overview#Section_5V

You need jumpers on "5V->SBC" and the "SBC->5V*" pins.

Ian

chrishornby

Thanks Ian, that worked! (But still cant get Vin to behave)

droftarts

@chrishornby check fuse?

Ian

chrishornby

Both fuses okay

dc42

I can probably fix it, but I won't have time for at least a week. It probably needs a new AOZ1284 chip, which I don't have.

A Former User

The Pi does not power the board. If I change the link from 5v>SBC to SBC>5v and power the pi, it doesn't power the board. I can't find the DUET 3 specific instructions for this in the documentation so maybe I am doing it wrong.

Sorry, I should have included a link to the docs.
https://duet3d.dozuki.com/Wiki/Duet_3_Mainboard_6HC_Hardware_Overview#Section_5V

When I connect the 24v Vin, all LEDs flash rapidly, whether the USB power is connected or not.
Surely the Board is not going to be able to supply enough current to the steppers if I just power it with the 5v. Doesn't it need the Vin supply too?

Yes, you'd need Vin as well, but from the first post saying you didn't have 5v and 3v3 I assumed Vin was ok, and supplying external 5v might be an alternative to repairing it if the issue was limited to 5v.

I don't think removing the int_5v_en jumper will make much difference and if our resident superhero can fix it then you're home ~~free~~ relatively inexpensively.

chrishornby

@bearer thanks. Please can i have an address to send it to? Time is not too much of an issue as i have put a trusty skr board into my mpcnc as a temporary replacement.

chrishornby

@dc42 sorry i replied to the wrong person. Please can you let me know where to send it?Thanks so much.

chrishornby

@dc42 If its the AOZ1284 would it be possible to bypass it with an off the shelf buck converter? It looks too small and fiddly for me to replace. What I would really like to do is return it to E3D from whom I purchased it for repair. But they just refer me to this forum. I don't really understand how they organise support. Is this forum monitored by the manufacturer? Is anyone able to give me a returns address. Sorry to sound confused, but the reason I purchased this was to avoid getting a cheap Chinese board which I could just throw away if it did not work too well. Just thinking of the planet I guess and wanting to support UK industry. Please be kind to a senior citizen who was raised in an age when stuff was repaired.

A Former User

@chrishornby said in Please kind Duet people, repair Duet 3 board:

I don't really understand how they organise support. Is this forum monitored by the manufacturer?

dc42 is the manufacturer
(edit: seems the forum has lost the signature usually added to his posts, but he'll probaby try to source the needed chip when he has time and get back to you)

If its the AOZ1284 would it be possible to bypass it with an off the shelf buck converter?

thats essentially what I had you try with USB, but seems the damaged chip affects Vin.

dc42

@chrishornby, I've replied by chat message.

chrishornby

Thanks! Replied.

zapta

@chrishornby said in Please kind Duet people, repair Duet 3 board:

I don't really understand how they organise support. Is this forum monitored by the manufacturer?

This forum and the duet3d.com domain that contains it are owned by the manufacturer. Look for users with Administrator or Moderators near their names.