Originally Posted by
stridera
I actually checked that. The hub is definitely at 5v. I know it supports up to 3A, so I wondered if there was no current limiting features on the board so it was accepting the full 3amps and frying it. Not sure. Also, I plugged the hub in first and tried to plug in the board while it was powered on (for the first board.) I think I saw a spark, as it touched the usb port. Makes me think there is a power differential. They're both plugged into the same place so there should be a common ground, but I'm not sure. Before the second board, I tested everything I could.
Colin is letting me RMA this one last time and I'm afraid to plug it in. (If I fry it again, it'll be a $80 fix each time.)
Do you guys have it plugged in via USB while the power jumper is on standalone? I really don't want to make this a sddisk only printer. :/ Maybe I'll grab one of my arduino unos and test each motor and switch.