duet 3 unresponsive on VIN



  • Hi,

    When supplied with 24v from power supply Duet3 6HC seems non-responsive. All voltage LED indicators are solid, but no ethernet connection is established.

    When VIN 24v is turned off and the Duet3 6HC is powered over USB I get the two lower voltage lights steady, but an ethernet connection is established immediately and DWC comes online.

    What can I check?

    Thanks


  • Moderator

    @hikkakaru Please post a picture of the voltage LED indicators under VIN power, and under USB power. Also, please post a picture of your Duet board and PSU wiring.

    Ian



  • Will do.

    I went back to the machine and flicked the power on and it established a connection to ethernet no problem..

    as I have a feeling this problem is going to be intermittent, i'll snap some pictures. Going to have to wait til the next failure for a snap of the LEDs.



  • Powered the machine off and back on the proceed with further configuration and ran into the unresponsive situation again. Here are some photos.

    The LED photo is hard to read, all 4 LEDs up top are lit, no USB LED, and a dim DIAG led.

    24v PSU with V+ going from 2 terminals to VIN & Out0 IN, 2 wires from V- going to GND and Out0 IN GND.

    PXL_20201020_112228053.jpg PXL_20201020_112255998.jpg PXL_20201020_112547189.jpg PXL_20201020_112558843.jpg PXL_20201020_112610362.jpg


  • administrators

    The dim DIAG LED means the firmware has not started up. That should normally happen only after the ERASE jumper has been fitted (in which case the USB interface will offer the Bossa port), or while the RESET button is pressed. IMO it's worth erasing the firmware and reinstalling it using Bossa to see if that fixes it, especially if it was running pre-release firmware.



  • @dc42 That's interesting. I powered off right now and tapped the reset key a few times; when I powered back on it came on no problem -- might I be experiencing a sticky reset button somehow?



  • @dc42 said in duet 3 unresponsive on VIN:

    IMO it's worth erasing the firmware and reinstalling it using Bossa to see if that fixes it, especially if it was running pre-release firmware.

    OK, will do. I have tried flashing the firmware with DWC successfully, but with no avail to the problem. is a Bossa reflash more thorough?


  • administrators

    @hikkakaru said in duet 3 unresponsive on VIN:

    @dc42 That's interesting. I powered off right now and tapped the reset key a few times; when I powered back on it came on no problem -- might I be experiencing a sticky reset button somehow?

    Does the reset button feel normal, i.e. a slight "click" when you press it?



  • @dc42 I didn't notice any strange feeling mechanically. Seemed fine to me, but system came up after playing with it while off.

    Probably just coincidence, if I keep power cycling it seems I get a successful boot about 40% of the time.

    I've also yet to experience an unsuccessful boot via USB power.. so that leads me to believe the switch itself is fine.


  • administrators

    @hikkakaru said in duet 3 unresponsive on VIN:

    OK, will do. I have tried flashing the firmware with DWC successfully, but with no avail to the problem. is a Bossa reflash more thorough?

    Only in that it re-flashes the fuse bit that sets the bootloader mode.

    I guess another possibility is that the RESET pullup resistor is missing. If you have a multimeter, try measuring the voltage between the two pins of the EXT_RESET connector. It should be 3.3V.



  • This post is deleted!


  • @dc42 said in duet 3 unresponsive on VIN:

    If you have a multimeter, try measuring the voltage between the two pins of the EXT_RESET connector. It should be 3.3V.

    those two pins, when it's in the dim LED mode, are putting out 0.2vdc for me. I haven't tested it when booted.



  • picture of booted via usb. Never any problems booting over USB voltage. Notice the active ethernet port.

    EXT_RESET still puts out 0.2vdc while booted up via USB.PXL_20201020_120930855.jpg



  • I will reflash firmware with Bossa when I awake in a few hours.

    Any tips or tricks in the mean time are appreciated.


  • administrators

    @hikkakaru said in duet 3 unresponsive on VIN:

    I will reflash firmware with Bossa when I awake in a few hours.

    Don't bother, there is definitely something wrong with the reset circuit on your board. I suspect that either R30 (which is close to the green VSSA fuse) is missing, or there is a weak solder bridge under the EXT_RESET connector.

    I approve a warranty replacement for your Duet 3. Please accept my apologies on behalf of Duet3D for the inconvenience this has caused you.



  • oh okay.
    Thanks for your time and diagnostics. I'll get that started ASAP.


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