Duet 2 Wifi fried?
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I am running duet 2 wifi board on e3d toolchanger.
I have all 4 tools on my device and needed to rebuild tool 2 due to a print failure that clogged up the hotend.
When I picked up tool 2 and proceeded to turn on the hotend heater it became unresponsive. I was re-using a heater component I had recovered from another tool for my rebuilt hotend, which was connected to a new thermistor same part cooling fans and hotend fans.
I shut down the printer and powered it again and it is only showing a blue LED light. The blue led light that was coming on was the one at the same level as the motor connections and not near the sdcar. I couldn't connect to the printer any more. Web interface was not up.
I then proceeded to plug in the usb cable to my laptop after verifying that the sdcard was not corrupted.
Wifi came back up and I was able to connect to my printer. The 2 led lights on duet 2 near sdcard slot lighted up and appeared to look ok. I even attempted to home the printer but that operation failed, which I expected since 5v doesnt have enough power for that.
I also measured the voltage at the dc power out to the duet 2 , when the blue light was on and it was 24v .
Any help would be appreciated to trouble shoot this further.
Thx
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@incurio It sounds most likely that the 5V regulator may have blown. This may have been caused by a short in tool wiring, hard to say. Check this guide for diagnosis https://docs.duet3d.com/User_manual/Troubleshooting/Duet_wont_respond and post a good, clear image of the board, particularly the area around the 3.3V and 5V regulators, U2 and U3. Replacement parts are available, see https://docs.duet3d.com/en/User_manual/Troubleshooting/Parts#voltage-regulators-1
Ian
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@droftarts here is photo when powered up using the micro USB
There is a red led light on near left side of image, I hadn't noticed that before.
Will fixing this require soldering work to replace fuse?
Thx
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@incurio I can't see any obvious signs of damage on the 5V and 3.3V regulators, but that doesn't necessarily mean that they are okay. The lit LED is the Z endstop indicator LED, see https://docs.duet3d.com/Duet3D_hardware/Duet_2_family/Duet_2_WiFi_Ethernet_Hardware_Overview#led-indications
You appear to have a Z endstop plugged in (though no X or Y endstop?), so it's probably not relevant.It's difficult to tell what is at fault. I would disconnect everything, then power the board only via mains power. If the 5V and 3.3V LEDs come on, and using a multimeter you can read 5V and 3.3V on some pin that provides these, it's probably a short in the wiring. If they don't, it could still be a short, but it has caused the failure of at least one of the regulators, probably the 5V regulator.
Ian
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@droftarts I measured the resistance of the heating element and it showed very little resistance 0.3 , I think this is the culprit. It is the only used component that I used.
Assumming this is correct, what is the fix for this? Do you have a part I should look for to attempt a fix?
thx
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@incurio If the heating element shorted, probably the main fuse has blown, rather than the voltage regulator. Check the 7.5A fuse by the power input.
Ian
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Here is 7.5A fuse and 1.5A side by side.
I think 7.5A is blown. Not sure about 1.5A it looks clean.
I checked the 15A fuse also and it looks clean it has a connecting metal strip
Please Advise,
Thx
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@incurio I replaced 7.5 and 1.5 fuse and it is working, thx
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undefined dc42 marked this topic as a question
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undefined dc42 has marked this topic as solved
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@incurio The 7.5A fuse is definitely blown. The other fuse is for the fans, and looks okay; it should be a 1A fuse.
Ian
