oliq

I don't have anything to add to the many updates you've listed here, but just wanted to say do keep us up to date on your build of this ultimate machine!

Thanks, I'm on the 8580s and I bought some copper heat sinks for them so perhaps I'll just leave my fan disconnected. Be interested if any users of other chips have found quieter fans.

Tried a few fans for my MB6582 build, they are all pretty noisy. Anyone recommend one that doesn't sound louder than my computer?

What are your tips and techniques for programming sounds? I've been messing around with the synth for a while and using it for some nice sounds, but I don't feel I've mastered the unusual architecture of this synth yet, despite some very nice happy accidents. This morning I started to get my head around wavetables, and while they seem powerful I'm still not sure how to make the best use of them. Alongside the presets thread I thought it might be good to start a thread sharing tips...

And here's the finished box =). All working very nicely now.

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.

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.

@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.

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...

@jayteeThanks, really helpful, will reply on the power supply issue on the power supply thread. Sorry for confusing things with multiple threads!

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...

@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.

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.

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?

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.