Yeah, but I wasn't entirely sure what it meant.
So, cutting that trace means you can still use the USB, but the board thinks you're using a USB connection that's somewhere other than physically on the board? If it works better why not build it that way? Do you lose a function?
Is it supposed to NOT send voltage back through the USB when the PS is hooked up? It seems like it shouldn't, cuz that seems stupid. So what is going wrong on the board to allow it?
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The USB 5V VBUS is connected to the output of the 5V regulator. This is bad for the regulator and bad for the PC. Some users report the regulator getting very hot (because it is trying to power the PC), other users report the PC giving USB over current errors. Nophead and Nothinman recommend cutting the 5V track to the USB connector. The only downside is the board needs the 12V supply before it will do anything, but who cares?
An alternate fix for the 1.3a board is to cut the trace between the USB chip pin 4 and C13. This is functionally identical to building a Sanguinololu without the USB port and FT232RL and using an offboard USB-serial cable. The advantage over cutting the 5V trace at the USB connector is that the USB serial port doesn't disappear from the host PC when the printer is switched off, which can anger host software that is still running.
So, cutting that trace means you can still use the USB, but the board thinks you're using a USB connection that's somewhere other than physically on the board? If it works better why not build it that way? Do you lose a function?
Is it supposed to NOT send voltage back through the USB when the PS is hooked up? It seems like it shouldn't, cuz that seems stupid. So what is going wrong on the board to allow it?