Hello,
I was practising when my Duo X simply switched off for no apparent reason. Now it doesn’t power up anymore.
I opened the box to see if there was any sign of damage but didn’t find any.
I unplugged the main board and tried to power it up separately. The network leds are on and after a few seconds I can hear the typical relay click. So I can suppose the main board works.
However I can’t verify it because nothing shows on the browser interface.
There is 12V power on the controller board connector.
There is no damage sign on the controller board.
Do you have any suggestions from here to make the Duo usable again ?
Is there any easy repair ? for example is there a fuse somewhere that I could check ? can I order a new controller board ? (assuming that the controller board would be faulty and not some other complex problem).
thanks.
I really doubt there is a fuse in these units or, since you seem to have opened the casing already, you would have seen it.
Now, if the LEDs on the ethernet connector are on (or flicking) and the relay clicks, there is power going in so your issue is somewhere else.
If you can, try another power supply, maybe the one you have now has an issue and does not deliver enough juice to power the hole unit…
Unfortuntely, aside from that, you will most likely have to send it for repairs.
thanks, I tried different power units.
also fuses can be very small and almost invisible, I had an Elektron Octatrack repaired by installing a real big fuse to bypass the miniature original one.
I submitted a support form two weeks ago and got no answer at this point. Has anybody here got his unit repaired at some point ? do you think I can keep hope ?
I was in contact with them several years ago, because one of my displays on my Duo broke.
They responded very fast, but that was at MODs high time.
At the current state I wouldn’t bet on your chances, but lets not loose hope yet.
Could you maybe make a short video on the powering up cycle, so we see and hear the current state, and maybe make a few photos from the insides?
Without a schematic it will be hard, but there is a slim chance someone recognizes something or has an idea how to test further.
here are photos of the inside.
I can’t post videos here ; the main board alone seems to function normally, but when assembled with the controller board it doesn’t show any sign of activity.
we recently got @jon back on the support seat, so hopefully your support email is going to handled soon.
if not just reply to the previous email with a link to this forum topic.
@falkTX I purchased his damaged duo x from denisp and it has been fixed to work properly.
But one of the components of the Q7, has burned out and I can’t find the model number. I looked at the open source version of the PCB and found that the files are not the same, so I don’t know what the Q7 component is, can you tell me and I’ll go buy it and replace it.
Can you decipher the model number on the U4 IC?
Looking at that datasheet could yield the typical schematic and the transistor to use.
just curious, how did you fix the unit ? happy to see it shipped successfully !
When I received the duoX, I purposely opened the cover of the duoX, and then accessed my repair-specific power supply to power on and check it, and soon there was smoke coming from somewhere, and it was supposed to be the power supply part, so I immediately removed all the structural screws and went to check them out one by one, and replaced some of the more commonly used components. I then realized that the power supply that arrived with the delivery was also bad. I came to the conclusion that the power supply was faulty before, which then caused the power supply circuit to be in a state of damaged high resistance, and by shorting it with a high current, it directly shorted out this high resistance and broke it down, and then by replacing these broken down components, the duoX was able to work.
It occurs to me that I can check DUOX’s github history of changes, and after checking the bom file, I see that the Q7 is a SI2312, and I’ve already purchased the component, so I’ll swap it in when the time comes.
