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  1. Yesterday
  2. MB6582 Control Surface troubleshooting

    It's working! 2 dud LEDs in the matrix was causing the CS to misinterpret button presses. Didn't realise they were dud for ages. 
  3. MB6582 Control Surface troubleshooting

    Back to my issue with menu, shift, and navigation right of the display buttons not working. Iv'e replaced shift registers, replaced all the transistors for the switches, and checked all joints in that area. Still no luck fixing the problem and I'm at a loss now what to do next.
  4. One MB-6582, One Power Supply: a Tutorial

    @jayteeIt was still dropping the 5v to 1v, but eventually I fixed the problem. I am not entirely sure where it was as I went through a very long process of checking for shorts and reseating ICs. Anyway, it's working now, I have sound from my two SIDs, information on my screen and lights on my control surface. Now to sort out the buttons that still aren't working, so will return to my CS troubleshooting on the other thread.  Thanks @jayteeand @Hawkeyefor you help with this one. It was a total pain but I have come out the other side with a better understanding of how this machine works thanks to your advice.
  5. [FS] MB 6582 with 4 SIDs

    The item is still available but i am not at home for another few weeks. Since a few people were asking, i will post an update as soon as i am back in germany.
  6. One MB-6582, One Power Supply: a Tutorial

    If you’re only briefly showing continuity when you first connect your probe (ie you get a short beep but then everything seems good) then it’s probably fine. That will often happen because your meter is charging a capacitor, allowing current to flow, which very briefly looks like continuity to the meter.
  7. One MB-6582, One Power Supply: a Tutorial

    My first test showed constant continuity between the ground and 5v. Some checking and fixing a couple of suspect looking joints and it's now just showing continuity briefly when I first connect the probe. I've disconnected the control surface and that's fine, the short is on the main board. Also took of the DC convertor and that's working fine on it's own directly connected to the PSU I'm using. I guess it's just a case of continuing to hunt for a short on the main board. Visually I've inspected the whole thing and it's not obvious to me yet...
  8. MB6582 Control Surface troubleshooting

    @jayteeThanks, really helpful, will reply on the power supply issue on the power supply thread. Sorry for confusing things with multiple threads!
  9. Last week
  10. One MB-6582, One Power Supply: a Tutorial

    Ah, sorry, replied on your other thread, didn’t see that you had posted here and already gotten the same advice. 
  11. Thanks for the encouraging words! I feel like it *should* pretty much just work, but of course I’m sure there will be some hiccups along the way.  I think the Bass Engine will be particularly fun with CV and gate outputs. Lead engine seems like it adds basically an entire rack of modules to a modular system.
  12. MB6582 Control Surface troubleshooting

    Doublecheck first to see if any two of the regulator’s three legs are short-circuited (three total continuity tests). If the other rails are good, sounds like it may be a short between 5V and gnd? If you find a short, you may or may not need to replace the regulator; some are well protected and will just start working again while others will fry. If you don’t find a short between two probably still failed for a reason so probably worth it to triple-check your work (jewler’s loupe can be had for cheap on eBay!)   Otoh, sometimes shit fails for no apparent reason and it’s just a bad part that needs replacing. Or sometimes you accidentally shorted something while working and didn’t realize it till later. Or some other freak occurance that borks your work but otherwise won’t happen again. So don’t stress too much if you can’t find an obvious fault. Try replacing it and if it fails again, then at least you’ve established a pattern and have a better idea what to look for. And if it works, it works.
  13. One MB-6582, One Power Supply: a Tutorial

    Only had time for a quick test this evening, but yes, there's some continuity between 5v and ground. Now to hunt down the short...
  14. Troubleshooting midiphy SEQ v4+

    In complement for an external power supply and USB power management. With this circuits the external power has priority over USB power. It works fine cause this is the one there is on all arduino uno board, so well improved. And I did the same thing on the dipBoardF4 external power module and use it. Best regards Bruno
  15. One MB-6582, One Power Supply: a Tutorial

    @HawkeyeThanks! Ah yes I did that, thanks for clarifying the terminology. My external PSU is still delivering 12v without being connected, and also 12v coming into the power in jack on the PCB when it is connected. I'll check for shorts where I was working when I get home later. I suspect it is the base board as I was trying to track down another problem and resoldering some joints just before it happened.
  16. One MB-6582, One Power Supply: a Tutorial

    PS: if you are not using an external switching voltage regulator, please forget my recommendation to test it "unloaded", as that is impossible, sorry for the confusion, hehe! :) Next up then would be to measure between 5V and GND and separate the boards to find on which board the problem is. Many greets! Peter
  17. One MB-6582, One Power Supply: a Tutorial

    @oliq sorry if it was unclear, if you have not done it before, the idea was just disconnect the PSU from your MB6582 and measure the voltages the PSU provides "unloaded", without being attached to any device. I'd half expect that you don't have a problem with the switching voltage regulator itself, as these are often normally protected against a lot of things like shorting, overcurrent, overtemperature... That way you can find out, if the PSU really has a problem or (and that in conjunction with measuring resistance between 5V and GND rails) if one of the boards (baseboard or CS) has a problem. In the best case, you would just remove the short (when you find it) and the PSU should continue to work, no replacement of the voltage regulator necessary. Many greets and good luck! Peter
  18. One MB-6582, One Power Supply: a Tutorial

    Thank you both, really appreciate your ideas. I'll have a look at implementing them tonight. Just wanted to ask what you mean Peter about running the PSU unloaded, how would I do that? Sorry for my ignorance! I've removed the ICs for now to avoid damage.
  19. Troubleshooting midiphy SEQ v4+

    Thank you latigid on and antichambre , i'm going to work on it :)
  20. One MB-6582, One Power Supply: a Tutorial

    @the_duckchild agreed on a potential unwanted short, it can happen quickly - @oliq could you measure resistance between 5V and GND with a multimeter? What happens if you run the PSU unloaded? Does it still hover at 1V and the switcher gets hot? If that happens, you've killed the switching regulator, but i'd think this probably would not happen often, i'd rather expect a problem on the board. If you can separate control surface from baseboard, recommend to do that, to find the short :). Many greets and good luck! Peter
  21. Hi jaytee, am a bit restricted on time at the moment with all the ongoing documentation, but just wanted to tell you, that i am with you and will try to replicate your setup a bit later on, if you manage to get it going! As we are using a normal AOUT implementation with MAX5500s and standard DOUT digital gates, i hope it should work somehow with the MB6582. The SSM2044 bassline demos here sound too awesome not to try: :) - and we should be able to do this in "modern" eurorack world now, i'd be really keen to combine a SID stereo pair with a pair of Polivoks filters :) Have a good time and best regards! Peter
  22. One MB-6582, One Power Supply: a Tutorial

    argh, I feel your pain when you're so close to finished! Maybe recheck any new soldering you did do with a magnifying glass? - the 5v rail runs a LOT of places, so any changes you've made it's not impossible they're shorting something somewhere that's causing it. I definitely did this once or twice in what seemed like innocuous places. It's really easy to accidentally ground the ribbon cables for example.  
  23. One MB-6582, One Power Supply: a Tutorial

    Thanks for this tutorial. I followed and had a working power supply on my unit. I have just been doing some final troubleshooting of the switches on the control surface and the power supply has failed. I've still got 9v on the 9v rail, but only 1v on the 5v rail and the switching regulator is getting really hot. I hadn't been changing anything in the power supply area, just messing with the control surface. I did plug a stereo jack into the core 1 socket right before this happened. My thinking is I need to replace that switching regulator for 5v, but I'm cautious to understand what caused this. It does appear to be still doing something, just outputting well below the voltage it should.  Any thoughts?
  24. Troubleshooting midiphy SEQ v4+

    Thanks for the info!
  25. MB6582 Control Surface troubleshooting

    Thanks, I tried Q1-Q4 to no success. Tracing the switches I am fairly sure that it must be one of the transistors, either/both t5 and t6 as they are both in the path for those switches and more delicate than other components. I've ordered some replacements so will try them.  Unfortunately my power supply (Option E) now seems to have failed. The 5v rail has dropped to around 1v and the switching regulator is getting really hot. I wasn't doing any reworking of the power supply section so I am a bit baffled as to what has happened with it. 12v is coming into the machine fine, and the 9v rail is OK. I'm wondering if the regulator for 5v is broken, although it's still doing something as I get some voltage out of it and it's heating up in use. Wondering if I should replace the 5v regulator, but I'm cautious about what has caused this.
  26. Bumping this thread again now that the modules are available. Anyone familiar enough with the MB SID CV/gate outputs to know how potentially conflicting assignments work? Any other insight re: the questions in my last post? I guess I can always build the modules and just see what happens but it would be nice to have some idea of expected behavior.
  27. Troubleshooting midiphy SEQ v4+

    Hi, there's no problem with that. 2 cases, device says "I'm here!" or host polls something like "are you here?"... In both cases the device always waits for a stable power to say something. No need of a complicated solution. Best regards Bruno
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