Oberheim OB-Xa tont Tune

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Spyros12
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Oberheim OB-Xa tont Tune

Post by Spyros12 » Thu Apr 30, 2020 6:14 pm

None of the voices will tune after replacing a problematic Lm324n at the bender board. Before the replacement the Oberheim worked like a charm. My technician replaced all of the electronic components at the bender board and the problem still occurs.
I unplugged the bender from the synth and run it without it and the voices were tuning.
I took it to two different technicians there are no other in my country, none could find what's the cure for my problem.
The whole instrument is cleaned and sprayed.
Do you have any ideas?
The photo is from the bender circuit.
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gweston
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Re: Oberheim OB-Xa tont Tune

Post by gweston » Mon May 18, 2020 5:15 am

Did the recalibrate the voice cards after rebuilding the bender box? I changed the pot on the pitch bender and had to recalibrate.

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