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Repair Siel Mono Vintage Analog Synthesizer Reparatur

Repair Siel Mono Vintage Analog Synthesizer Reparatur

Repair Siel Mono Vintage Analog Synthesizer Reparatur
Here's a Siel Mono Vintage Analog Synthesizer that came in "not working". Ok, some faults are too easy to find. The wires in the mains plug were just loose...
Repair Siel Mono Vintage Analog Synthesizer Reparatur
But playing the synthesizer and looking inside showed signs of heavy corrosion. I suggested my client to do a full restoration and he agreed. 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).
Repair Siel Mono Vintage Analog Synthesizer Reparatur
I started to clean the contacts...
Repair Siel Mono Vintage Analog Synthesizer Reparatur
And finally they looked like this:
Repair Siel Mono Vintage Analog Synthesizer Reparatur
I continued with fader/slider cleaning, which I did my usual way. Open, cleaning, closed, test...
Repair Siel Mono Vintage Analog Synthesizer Reparatur
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 am available silder.
Repair Siel Mono Vintage Analog Synthesizer Reparatur
Next was the switch panel. These contacts work similar to the keyboard contacts. They also looked black, heavily corroded.
Repair Siel Mono Vintage Analog Synthesizer Reparatur
Repair Siel Mono Vintage Analog Synthesizer Reparatur
After cleaning they looked nice and shiny and they work great again.

Caution


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!