Whoops! Short to ground, now Duet WiFi won't boot.
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If the green 3.3V LED is lighting up when you apply USB power, it's worth trying the erase jumper to see if you can get the Bossa port to appear. There have been a few instances of users getting over-voltage on the 3.3V rail which has fried the SD card and the WiFi module, but the MCU has survived with just the firmware erased or corrupted.
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Well, if that's the last ditch effort, I think we can assume that the board is done. I haven't seen any wires damaged except the motor ones, but I am thinking that there must have been also a short to the Z probe. (Hope that doesn't mean that the Z probe is also fried, but I will probably operate on that assumption. $300 CAD in electronics cooked because I didn't implement my $15 CAD drag chain. There's an expensive lesson.
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if you don't have a working paneldue port then you've got nothing to loose by trying the erase jumper.
did you measure the 3.3v value?
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Oky, multimeter tests all voltages as close as I can tell with my multimeter. 3V3, 5V and VIN all within expected spec.
Erase jumper tried. No change. No USB.
Stick a fork in 'er gents.
So I'll spend a bit of time looking for my spare board. Ironically the reason that I hve a spare board is because I couldn't find it when it was time to install. This is actually my first board (Rev 1.03) which I bought another, and got a 1.04. Looks like this one likes to hide when I need it, so of course it'll turn up as soon as a new one arrives. Gotta wait for the 15th though, I spent my play budget on CNC parts.
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So I don't know that there's anything that I can do to resurrect this thing, so I'm considering it gone. My spare one was apparently among the things stolen from my car earlier this summer.
So I will be ordering a new one. but is there enough advantage to make it worth ordering a Duet 3 instead? I certainly don't need the extra motor drive for this printer. Well, this printer was designed pretty much tot he capabilities of the Duet 2, so more or less, it's probably best off with another. There is still that little niggling bit of doubt though.
And of course, as always the next printer is on the drawing board. (Or, more accurately, in the CAD folder.) Always a learning experience, I learned more things from building this printer, and I believe that I am ready to move to the next design to be even better. Maybe this one will make use of the Duet 3, but I have not run into any issues with my current one that I think it will be taken out of service when the new one is built. Then again, that's what I though about my MBOT clone when I built this, and I can't even remember when I took the hotend apart. It certainly hasn't been used, probably since last summer.
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I think in this case you'd probably be best served by another Duet 2 if you don't require any of the expandability options of the Duet 3 (though the Duet 2 still has some advantages over the Duet 3 in some ways). The Duet 2 remains the primary consumer targeted board. The Duet 3 might also be a bit harder to find at the moment.
The Duet 3 mini 5+ might fit the bill if you wanted to wait a bit longer and want some more modern features.
https://forum.duet3d.com/topic/17409/duet-3-mini-5-initial-announcement?_=1599755114620
https://duet3d.dozuki.com/Wiki/Comparison_of_Duets_vs._other_32-bit_controller_boards
https://duet3d.dozuki.com/Wiki/The_Duet_family_of_motion_control_electronics
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From your description we can conclude that the processor has certainly failed. Unfortunately, the over voltage that killed the processor may well have killed all the stepper drivers too. So IMO it's not worth trying a processor replacement, given that it is tricky to do.
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Spool3D (Authorized Canadian reseller) says that they have the 3s in stock.
I don't think that I need the 3 just yet, and with the 2, I should be up and running again faster, I just need to re-do all that wiring to the hotend and install that drag chain. While I'm at it, I'll replace those Chinese LEDs that turned yellow and are running at about 20% brightness. Unfortunately, I think that all I have on hand are more of the same ones, but, at least they should do for a few more months before they turn yellow too. Also on the to-do list is to install the 12V adapter for 12V fan power, sitting next to the drag chain. I think that I'll install a small PCB on the hot end with jumpers to connect motor, Z probe, heater and fans. The trick will be setting it up so that one cannot plug the wrong things in. Maybe something like a DIN connector would be better. Still have time to make that decision. Probably 12V power is next. While I'm at it, I'll re-tune the 24V power, it was creeping up to 24.4 there.
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Well, at least there is a bit of good news. My IR height sensor appears to still be functional. By no means an exhaustive test, but just plugged it into 5V power. LED flashes 4 times to indicate an error, but that's because the output is left floating. Bringing the sensor towards the table, the LED comes on at about the correct height, so the sensor itself seems to be functioning correctly. That saves me some cash if I don't need to replace it.
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Wow. It's probably been almost 2 years since my old printer has done anything, but I think I'll have it working as soon as my Amazon order gets here today.
The other order will be tomorrow. A new Duet 2 Wifi with external antenna. I wasn't having reception problems before, so probably not necessary, but it''s what was in stock.
My spare board is gone. So is the Pi that I had programmed to manage many of the PanelDue functions, so I caved and bought the PanelDue controller and a 5" touchscreen. No idea how I'm going to mount it right now, but I'll think of something.
