@dc42 said in Problem on maestro:
My best guess is that something is going wrong with the +5V and/or +3.3V supply rails when you apply VIN power.
Does it do the same thing if you disconnect everything except VIN and USB from the Duet?
Does the A4403 chip (small square chip close to the VIN terminals) look OK?
By disconnecting everything, the same thing happens.
I looked with a magnifying glass and everything seems normal