Duet Maestro board unresponsive.

[jeffremiller]

Hello -
Not sure what I have done here. But my board seems "dead" I've disconnected every cable from the printer, an M3D Promega, and removed the board from its' mounting.

When connecting to USB, I get 3 red LEDs lit but the PC doesn't see the board (my tablet does see it as "Generic Billboard device) but I cannot seem to get it to register as a serial port (tried Windows and Mac)

Any thoughts on what to try? or is it just toasted?

[dc42]

Does the green LED indicating the presence of 3.3V power light up?

See https://duet3d.dozuki.com/Wiki/What_to_do_if_your_Duet_won't_respond.

[jeffremiller]

No... not when connected to USB only.

Nothing is connected to it

[dc42]

It sounds that your Duet has developed a fault on the 3.3V supply rail. As it is in a Promega, best talk to M3D.

[jeffremiller]

@dc42 Thanks - support ticket opened.

There is a small spot on the U2 regulator... I wonder if it grounded and popped the reg? I have done nothing to the printer other than change nozzles... but If I read the wiring correctly, that might have been enough to short something to ground.

Thanks

[dc42]

U2 is the 3.3V regulator. It normally survives having its output shorted to ground.