Ender 2 Pro failed with SerialException

What is the problem?

After 10 hours of printing a large model, OctoPrint failed with USB "SerialException" error.
dmesg in Pi says:

[Mon Jan  2 17:11:12 2023] ch341-uart ttyUSB0: usb_serial_generic_read_bulk_callback - urb stopped: -32
[Mon Jan  2 17:11:12 2023] ch341-uart ttyUSB0: usb_serial_generic_read_bulk_callback - urb stopped: -32
[Mon Jan  2 17:11:12 2023] usb 1-1.4: USB disconnect, device number 3
[Mon Jan  2 17:11:12 2023] usb 1-1.4: failed to send control message: -19
[Mon Jan  2 17:11:12 2023] ch341-uart ttyUSB0: ch341-uart converter now disconnected from ttyUSB0
[Mon Jan  2 17:11:12 2023] ch341 1-1.4:1.0: device disconnected
[Mon Jan  2 17:11:13 2023] usb 1-1.4: new full-speed USB device number 4 using xhci_hcd
[Mon Jan  2 17:11:13 2023] usb 1-1.4: New USB device found, idVendor=1a86, idProduct=7523, bcdDevice= 2.64
[Mon Jan  2 17:11:13 2023] usb 1-1.4: New USB device strings: Mfr=0, Product=2, SerialNumber=0
[Mon Jan  2 17:11:13 2023] usb 1-1.4: Product: USB Serial
[Mon Jan  2 17:11:13 2023] ch341 1-1.4:1.0: ch341-uart converter detected
[Mon Jan  2 17:11:13 2023] usb 1-1.4: ch341-uart converter now attached to ttyUSB0

New Ender 2 pro, 4.2.3 board, Marlin 2.0.6.1, Pi 4B with 4 GB RAM and original power supply, "not cheap" 0.9 meter USB cable (5V Pin not masked) plugged into Pi USB 2.0 connector. 115200 baud set.

What did you already try to solve it?

I am going to order another USB cable, but did not find one (which looks to be "pro") with ferrite, yet.

Have you tried running in safe mode?

No. I have only a few plugins installed and it looks like a failure on the hardware level.

Systeminfo Bundle

octoprint-systeminfo-20230102214530.zip (242.5 KB)

Additional information about your setup

Pi 4B, OctoPi 0.18.0, OctoPrint 1.8.6.

Any hints?

Is 5V Pin masking needed for this printer? The printer display does not light up when the Pi is connected and the printer is off.

Thanks!

I would suggest that you try masking the 5V its a good practice for all printers. It would also at least rule out the board somehow pulling the 5v down.

Also check your USB cable connections, Is the connection solid, could it be getting moved(wiggled) and that is causing it to disconnect? The log suggests that it disconnected and was almost immediately connected again.

1 Like

Thanks for your quick reply.

I have now ordered a shorter USB cable with ferrite and also the 5V disconnect adapter "Power BLough-R".