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Siel Mono Vintage Analog Synthesizer. Condition „not working". Ok, some faults are too easy to find. The wires in the mains plug were just loose...
Playing the synthesizer and looking inside showed signs of heavy corrosion. Starting with the keyboard and the keyboard contacts. They were heavily corroded. Just have a look to the bus bar (the long thick solid wire, which appears black).
I started to clean the contacts...
After cleaning they looked like this:
I continued with fader/slider cleaning, which I did my usual way. Open, cleaning, test...
One slider was broken and had to be replaced. Since there was no NOS (new old stock) available I had to build my own version out of an available silder.
Next was the switch panel. These contacts work similar to the keyboard contacts. They also looked black, heavily corroded.
After cleaning they looked nice and shiny and they worked great again.
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!