Fixing broken USB in 3D printer (ATSAM3X8EA-AU / Arduino bootloader)

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repetier da-vinci Printer Firmware

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  • Repetier-Firmware-4-Davinci

    Repetier-Firmware-0.92 based for DaVinci printer (Beta - so far so good)

    • I've had an XYZ DaVinci 1.0A for a couple of years now, flashed with custom Repetier firmware and connected to OctoPi / OctoPrint. It worked fine, until a couple of month ago the USB connection started getting flaky and I needed to power-cycle the printer to get USB back. Now USB disappeared completely. The printer apparently still runs its firmware (it shows its menu on the LCD when turned on), but there's to USB connection to the Pi. Plugging the printer into a different computer shows no USB device / only USB errors in Linux dmesg. I've tried resetting the firmware via J37 which should put it into firmware upload mode (acting as an Arduino board), but still nothing. I used an oscilloscope to check and there's activity on the D+/D- lines, so the cable is good, but the printer mainboard isn't responding. I suspect the Atmel ATSAM3X8EA-AU that provides the USB to be broken (at least the USB part). I could change the chip, but am unsure if / how I can flash the blank chip with the new firmware (an Arduino bootloader?). If you have ideas what else I should check or clarify the firmware situation I'd be grateful! If you need mainboard images, tell me. I have no schematics though...

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