Might have killed my Duet

Exerqtor

I just managed to shit the bed bigtime, was about to apply some Dimafix to the bed and somehow the sponge part came of with the cap.

So when i turned the Dimafix bottle upside down to apply it to the bed i just poored it out everywhere, and some splatter apparently managed to hit the Duet (WiFi 1.03), now either X or Y (corexy machine) do anything if i try to home the machine The bed moves down, but then nothing.

I flipped the switch and powered of the machine as soon as it happened and waited for everything to flash off before i turned it on again. Any pointers to how i should proceed with the diagnosing what actually need fixing.

Should i try to pull out the complete card and clean it with some IPA and hope it's a "intermittent" short somewhere?

chrishamm

@exerqtor Since you can still start it up and move at least one axis, it doesn't seem too bad yet. This means the +5V and +3.3V rails are still alive. In any case, I'd go ahead and try to clean everything up as well as possible.

Can you explain what exactly happens when the bed stops moving, do you lose connection to DWC/PD too?

kb58

You can try washing the board in distilled water, then putting it in a warm area to dry. That said, were any changes made to the printer before the failure? It's highly unlikely that Dimafix is causing the problem, but try the above.

Exerqtor

@chrishamm said in Might have killed my Duet:

@exerqtor Since you can still start it up and move at least one axis, it doesn't seem too bad yet. This means the +5V and +3.3V rails are still alive. In any case, I'd go ahead and try to clean everything up as well as possible.

Can you explain what exactly happens when the bed stops moving, do you lose connection to DWC/PD too?

Yeah it seems like it's "just" the X and Y drives that ain't responding. The reason for the bed going down and stopping is that it's a part of the homing routine. So thats totally normal behaviour so to say (bed down 5mm, home X/Y, move to X/Y probe point for probing Z and then probe Z) DWC and PD is still responding and nothing strange happening. Since the X/Y axis don't get homed i get an error prompt that axis don't get homed etc.

So it looks like it's isolated to the X/Y movement

@kb58 said in Might have killed my Duet:

You can try washing the board in distilled water, then putting it in a warm area to dry. That said, were any changes made to the printer before the failure? It's highly unlikely that Dimafix is causing the problem, but try the above.

Nope no changes at all. I had just finshed a print and removed it from the bed, hence why i was about to apply some more Dimafix.

chrishamm

@exerqtor You may have blown two stepper drivers then. Perhaps try to remap XY to other stepper drivers (possibly by unplugging the Z/E motors while the machine is off) using M584 in your config.g (don't forget to change the corresponding M569 lines as well if necessary) and check if that lets you home XY again.

Before you do so, I'd check if the endstop states are reported correctly via the object model explorer (see sensors -> endstops).

Exerqtor

@chrishamm yeah i fear that those two are dead I had to go out for the day so i can't really check anything before tomorrow.

But i'll pull out the board and spray it down with electronics cleaner and blow it with compressed air and look for visible damages before i plug it back in

Exerqtor

Dodged the bullet this time!

Took the board out and cleaned it off repeated times with some Würth electronics cleaner and blowdried it with compressed air.

When i hooked it back up again everything except the Y stepper moved. Turned out that the Dimafix had soaked into a allready bad crimp on the molex connector, so with that re-cripmed it's now all good again