Hi everyone, sorry to bother you — I need some help. I gathered the courage and decided to replace the 8 encoders on my Machinedrum Mk1. Now, when I turn encoder C and G, and when I use the push function on encoder E, they trigger the LFO button, trig 5, and trig 13. Could anyone give me some hints or ideas on how to debug this and track down the issue? Thank you very much in advance — I’d really appreciate any help.
Issue video recording - https://drive.google.com/file/d/1Gck0kGKRF1U5P7fMUhAvjITy9SkXnIUP/view?usp=sharing
Hi, I don’t know if I can help but if you show a high res image of the solder side of the board it will be easier to troubleshoot.
First I’d try reseating the cables betwen the PCBs just to make sure that 2 contacts aren’t touching which is then in turn shorting the wrong things to ground as a group when those encoders are used.
Otherwise, it does sound like you have a bridged connection somewhere so you’d need to follow the traces and see if they meet anywhere like at an IC. If it were disturbed and the solder is lifting, it might need to be reflowed. If you suspect you’ve found the culprit you might gently press on the ic while testing the functions and see if the behavior stops.
If you can’t identify the issue visually, you could carefully desolder those encoders one at a time and test the functionality in between to see if the issue stops, however I don’t know how the machine will behave on a software level if it can detect that the encoder is missing, but I suspect that it will probably still boot up.
There is no service manual or info from elektron about these so if you aren’t confident to work on it further, I’d find a good local electronics tech and ask them to take a look.
The quick answer is that it’s very difficult to troubleshoot electrical stuff resulting from a bad install over the internet and unless there’s a glaring issue photos won’t help, but having a photo of the work is more likely to yield useful opinions than only having the video showing the malfunction.
If it were me, I’d run test mode by holding down func while powering on and then release it when the startup menu apears and run the error test. See how the encoders and trigs behave during the keys test portion (after checking the results of the error test just press buttons and turn knobs and the screen will display the name of the button or encoder).
Write down anything that you learn from the keys test and any errors displayed, and then go from there.
Good luck
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