@diy-o-sphere yes, I have seen this jumper.I have tried both ways. If I connect the control wire to + 5v or to the gnd depending on the position of the jump, the relay works. But PS_ON, whether I put the EXT 5V jumper or not, does not control the relay. I specify that I put M80 in Config.g and that I also tried to send it by YAT. Despite an OK response nothing happens. Do you know a method to test the operation of PS_on on the card?

@nurgelrot . Hello thanks for your advice. Here pictures. I dont think it's a voltage problem. I have tried to connect the relay in wire (white on the picture) to EXP1 (5V) and the relay has worked. ![alt text]

Hello, I have a CR10 printer and my board is fire down. I have bought a duet2wifi to replace it. I try to make an auto power off :

I upgrade firmware to 3.2.
When i send M80 PS_ON state dont change. What is wrong ?