Oberheim OB-Xa Lower Board Issue

Jacob Hunt · Post by **Jacob Hunt** » Thu Sep 19, 2013 4:50 am

Hey everybody, I have an Ob-Xa that isn't behaving just right. The bottom voice cards (1-4) do not respond to filter tracking, sync, or f-env controls. The pins the voice cards sit on have completely wrong voltages for these controls. Sync actually puts out a negative voltage rather than +15, and tracking has a very small amount of voltage on it. What could be causing this? If anybody can help me I'd be very grateful. Thanks!

Also, I have an Arp Omni that I'm not sure about. Should it's minimum release time be around a second or more? It seems like the notes blend alot more than they should.

Jacob Hunt · Post by **Jacob Hunt** » Tue Sep 24, 2013 8:40 am

Well, it turns out the problem was from a bad voice card. I took out the problematic voice card, and the other three on the lower motherboard started behaving like normal. Now I just have to figure out what is going on with this last voice card, and the Oberheim will be just about 100% healthy..

synthparts · Post by **synthparts** » Wed Sep 25, 2013 1:07 am

I have a few working OBXa voice cards (with or without CEM chips) if you want just swap it out...

Jacob Hunt · Post by **Jacob Hunt** » Fri Sep 27, 2013 6:18 am

Thanks, but I probably won't be able to afford a whole new card, but I know I'll need at least one CEM for this card, the 3310. But now a whole new problem has come up, making the entire synth almost completely useless for now.

Oberheim OB-Xa Lower Board Issue

Oberheim OB-Xa Lower Board Issue

Re: Oberheim OB-Xa Lower Board Issue

Re: Oberheim OB-Xa Lower Board Issue

Re: Oberheim OB-Xa Lower Board Issue