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Oberheim OB-Xa Vintage Analog Synthesizer Reparatur Service

21. Februar 2021

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Repair Oberheim OB-Xa Vintage Analog Synthesizer Reparatur Service

Another Oberheim OB-Xa restoration. This one came in with the usual issues. Keyboard wasn't fully working and needed to be cleaned. PSU wanted to have an overhaul. All potentiometers and buttons needed a precise cleaning, etc...

Some control voltages weren't working correctly. Then I located this dead TL084 OpAmp IC.

One OSC wasn't working. I found one dead CEM3340 oscillator IC. Luckily there is a today's replacement reissue IC. But unfortunately this didn't track the same way then the other. I had to modify the OSC resistor network to get the right tracking.

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!

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