Blown driver



  • Doing a new build and been plugging in new stepper motors to test (all while switched off) just plugged old ones back in as needed to print a new end stop and managed to miss a pin 🀦

    Smell of smoke has now died down, showing a short to ground error now and Z axis dead.

    Are the drivers replaceable?

    In the meantime to use printer I want to repurpose E1 for Z axis, can anyone point to a guide for connecting both steppers to this? Really don't want to blow that getting my wiring wrong.



  • Yes, the drivers can be replaced. It requires a medium high level of skill with "hot air rework" techniques.

    If you choose to have someone do it, you are taking some risk that the function of the entire board could get worse. Hopefully, they will be able to replace the driver and everything will be back to original function; failing that, you could still have one dead driver, and worse case, adjacent parts of the board could be damaged. Don't let that scare you... it is more a "full disclosure" kind of thing.

    Depending on where you are in the world, here is a list of people who are willing to try:

    https://forum.duet3d.com/topic/13875/community-repairs?_=1589301380721



  • Do you have a part number / link for the driver? Couldn't see it listed under replacement parts page.

    Think I have killed stepper motors as well, 99% sure I've got series wiring correct, gives a short to ground error, plugging in individually (removed X carriage so can move independantly) with single wiring and they just grind and give short to ground error. Plugging another stepper runs fine.

    Is it likely I've fried steppers as well? When plugged in one motor was connected correctly, one was 1 pin down e.g. 2B N/C, 2A->2B, 1A->2A & 1B->1A.



  • @Via said in Blown driver:

    Do you have a part number / link for the driver?

    which board is it? the duet2wifi/ethernet uses TMC2660-PA and the Maestro TMC2224-LA i believe.



  • @bearer Cheers, sorry forgot to mention it's the Duet 2 WiFi

    Steppers definitely dead, expensive mistake! Although not as mad now and it is a good excuse to upgrade to the Duet 3 😈



  • @Via said in Blown driver:

    Duet 2 WiFi

    You might be able to get some low temp solder (like quick chip (138C)) to remove the blown driver without needing a hot air station, but you'd want to pre-heat the whole board in any case (another printer with a 100+C hot bed maybe?). But yeah, the parts aren't free and quick chip adds up; the Duet3 also comes at a premium though.



  • Drivers have that heat sink pad across their entire bottom... not what I'd recommend for someone's very first attempt at chip replacement, with so-so tools.

    Of coursd, @Via it is your choice, if you are comfortable trying, go for it. At the same time, recognize that the board can be damaged in the attempt.



  • @bearer said in Blown driver:

    TMC2660-PA

    TMC2660-PA does not have a thermal pad which is why its possible to remove it without hot air. (and if the option is not repairing it no big deal)



  • @bearer said in Blown driver:

    @Via said in Blown driver:

    Duet 2 WiFi

    You might be able to get some low temp solder (like quick chip (138C)) to remove the blown driver without needing a hot air station, but you'd want to pre-heat the whole board in any case (another printer with a 100+C hot bed maybe?). But yeah, the parts aren't free and quick chip adds up; the Duet3 also comes at a premium though.

    Just been doing the numbers on this myself. -
    Getting "Driver 0 short to ground" after stupidly plugging a motor in without shutting off the power first.
    The driver itself is cheap, but the associated bits add up.
    Still, a new board is about five times that cost here is Oz, so I figure it's worth a shot.

    parts.png



  • @OwenD said in Blown driver:

    but the associated bits add up

    ChipQuick stuff is pricey, but you can get generic Bi58Sn42 solder or paste for a fraction of the price, same with solder wick. Shouldn't need two sizes for this job, I use 2mm for 95% as its a good fit for the medium tip I use for wicking. I wouln't skimp on the flux and solder though, and due to the 2oz copper thickness preheating the board is essential.


  • administrators

    The most common reason for a driver to fail is that the stepper motor wires haven't been phased correctly.



  • @dc42 said in Blown driver:

    The most common reason for a driver to fail is that the stepper motor wires haven't been phased correctly.

    @dc42 I know there is a limit on how far you can productively "read backward" in a thread. In this case, the OP stated it was a wiring fault, connector plugged in "one pin off". So you are spot on, wiring, and the OP knows how to prevent it in the future.



  • Could that be made less fatal if turning the current right down to the minimum allowable until wiring is sorted out? But if you can't get a positive test without risking a failure then moot point i guess.



  • @dc42 said in Blown driver:

    The most common reason for a driver to fail is that the stepper motor wires haven't been phased correctly.

    Would that cause the driver to fail with a short to ground error?
    It so, it would help explain how it happened.
    I was changing an extruder and plugged the wrong motor into the X axis initially. The extruder I was replacing uses a different motor type.
    When I got the short to ground error I assumed I must have forgot to shut down before I plugged a motor in, even though I was β€œsure” I had.



  • I do have hot air station but only used to replace mosfets so I'm 50/50 if I will attempt to replace or just leave how is... in old printer (once I replace Z steppers).

    Duet3 in the post for new one πŸ˜‡



  • @Via said in Blown driver:

    50/50 if I will attempt to replace or just leave how is

    If you have hot air and a 2nd printer whose hotbed you can use to preheat the board it shouldn't be too bad. The Z driver is a little extra tricky with less physical clearance around the chip, still possible to shield the surrounding parts but a vacuum pickup helps a lot to pick up the bust driver. On the other hand if you can re-purpose it as is then enjoy the Duet3:)


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