Heater Fault heater 1 will not reset.

Phaedrux

Sorry for the delay. Reviewing the thread.

akrogolf

dc42

@akrogolf I suspect you either have an intermittent short in the hot end between sensor 2 and the heater (possibly via the hot end metalwork) or you have had electrostatic discharge (ESD) between the hot end metalwork and the sensor wiring. The Duet temperature inputs can normally tolerate a short but do not always tolerate ESD.

My suggestions:

Ground the hot end metalwork to Duet ground, either directly to the VIN ground wire or indirectly through a high value resistor to any Duet ground connection. This will prevent extrusion causing a build up of static charge.
Test all three temperature inputs of the Duet 3 Mini using either a thermistor or PT1000 sensor that is not mounted in a hot end, or using a fixed resistor. They should give the same reading to within a few degrees. If the input that sensor 2 was connected to turns out to be faulty then it may be possible to rescue it by replacing the series resistor.

akrogolf

@dc42 I totally rewired everything. I did as you suggested for new wiring (ordered a new board).

I tested the temp inputs, i get no reading on 1 or 2, and 0 works. If i were to replace said resistor.... where would i find information on this?

Anything about a warranty claim?

dc42

@akrogolf if inputs 0 works but 1 and 2 don't then it could be that the series resistors for both input 1 and 2 have failed because of ESD or a short on the hot end. The series resistors are R60, R61 and R62 for inputs 0, 1, 2 respectively. They are 2.2K 0.1% tolerance 0402 size resistors. You could replace the faulty ones with 2.2K 1% tolerance resistors, at the cost of slightly less accuracy when using PT100 sensors.

These resistors are located close to the temperature connectors. Here is an extract from the PCB layout:

I suggest that you test the resistors with a multimeter before removing them. Bear in mind that lead-free solder tends to develop a tin oxide coating, so it can be hard to get a good contact between the multimeter probes and the resistors.

I find that the easiest way to remove 0402 components is to use a soldering iron with a bit that is just large enough to cover both ends of the component. Preferably, place the Duet on a hot plate heated to between 100C and 125C and allow it to heat up. Put some fresh flux-cored solder on the soldering iron bit and immediately apply it to the component. When the solder melts, surface tension will usually cause the component to stick to the bit and it will lift off when you remove the soldering iron.

To solder a new 0402 component in place, I normally clean the solder off one of the pads using solder wick and then apply no-clean flux to both pads. Using a fine-tipped soldering iron bit I heat the pad I didn't clean and with fine tweezers I push the new resistor on to that pad. Remove the soldering iron and let the solder set. Then solder the other end.

Alternatively, if the old resistors have failed open circuit, you can leave them in place and solder the new resistors on top of them.

You haven't indicated in your profile which country you are in; but if it happens to be the UK then I can do this for you. Otherwise, you may have a hackspace or makerspace local to you where you can find someone more experienced to help you.

It's also possible to use hot air soldering equipment to desolder and solder the resistors, but in this case the plastic parts of the temperature connectors must be removed first, otherwise the hot air will melt them.

akrogolf

@dc42 I don't really have time to do this type of repair. I have 2 boards that are not in use. Is there anythign duet can do as far as warranty replacments?

I have 4 boards total - all duet 5 mini - 2 of them are described in this thread. A third just started doing this:

Your Duet rejected the HTTP request: page not found
Check that the SD card is mounted and has the correct files in its /www folder

... I reformatted a new card and tried the help section in https://forum.duet3d.com/topic/6798/your-duet-rejected-the-http-request-page-not-found.

with no luck.

So now I just have the 1 board working on 1 printer..

akrogolf

@dc42 I get this error when trying to remount the SD card - it does this for 2 different cards.

WiFi module is connected to access point *********, IP address 192.168.68.107
Error: M21: Cannot initialise SD card 0: Card is unusable
ok
M21;
Error: M21: Cannot initialise SD card 0: Card is unusable
ok

Also the usb connection seems to interrupt when I power on the machine - as opposed to just being powered through the usb.

Phaedrux

@akrogolf said in Heater Fault heater 1 will not reset.:

Is there anythign duet can do as far as warranty replacments?

Can you give a listing of your boards and their faults and where and when they were purchased?

akrogolf

@Phaedrux

They were purchased from fillastruder.

202106-0131 : both hotend temp sensor inputs do not work.

202106-0138 : cannot connect to Wi-Fi. Cannot connect to pc with usb cable. Most things do not work

The other was is still mount to the machine: I get the error listed above. Seems to be as card socket doesn’t work.

Phaedrux

@akrogolf said in Heater Fault heater 1 will not reset.:

The other was is still mount to the machine: I get the error listed above. Seems to be as card socket doesn’t work.

Also from June 2021?

akrogolf

@Phaedrux all purchase feb 2022, wasn’t installed untill November 2022.

I bought a single replacement with new chip this year but that one is working - only one of 4 that is.

Phaedrux

Please send an email to warranty@duet3d.com and CC your reseller. Include a link to this forum thread and the details of your original purchase. You'll receive a reply with a form to fill out.