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Solton Programmer 24. The first issue was the missing main output. I suspected the relais which indeed was the first failure point. I temporarily bridged it, while looking for other issues.
Some instruments werent't playing and the Was a "constant" strings sounded like weird hanging notes. I could fix some problems by changing some logic and linear ICs. But bass was still not playing and strings had still these bad weird hanging notes.
Maybe an issue with the operating system (OS)?
And guess what... it was the Operating System that wasn´t working correct. So I burned three new fresh OS eproms and voila, the Project 24 was fully working.
There are lethal voltage exposed in electronic devices. Unless you know what you are doing, don’t try this. If you following along, you doing so at your own risk.
I’m documenting repairs for my reference and yours.
I do synth restorations and repair with a specialty in vintage synthesizers, drum computer and other vintage gear, based in Düsseldorf, GER. Get in touch about your synth situation!