Recently configured a Rambo, programmed with Marlin 1.0.0 RC2. Worked fine, motors, temp, monitor, etc.
Turned the Hotend on, and watched as it climbed to 177C.
Then noticed that my USB cable was hot (starting to melt), and the USB port on the Rambo was melted.
I did have the Power select jumper set to PSU.
Any ideas what could have caused this?
Does the jumper have to be set to USB if you don't have an SD and are programming from the pc?
Thanks for any help.