Did you check the audio out board........can you make a basic patch
with osc,filter,vca

If the machine sounds with a basic patch, the tape is bad or
incomplete...you should be able to grab the vca knob and raise it to
hear sound.......if you cannot hear the sound of the basic patch, your
audio out board may not be seated or connected.

I think some of those machines had an audio upgrade to stereo and this
could be the culprit.
Derrick

On 5/30/09, lawjcrg < lawjcrg@... > wrote:
> Hello: at the cost of a small fortune, I've just successfully restored an
> OBX-A that was left for scrap. My repair (surprisingly) had a backup tape
> of the presets from another obxa that had come through his shop. Listening
> to the presents that loaded in and comparing them to the preset chart in the
> owner's manual shows that most of these are the factory presets (there may
> be a couple of the other owern's patches thrown in). Here's my issue. for
> patch A3 and the last two groups (CD and ACD) if I push the patch
> combinations, different lights light up, indicating to me that the patch is
> actually loaded and the synth has turned on the various parameters that make
> up that particular patch, e.g, saw versus other waves, unison or not, s/h or
> not, etc.--but NO SOUND comes out. What does this indicate There is
> something wrong with the memory patch of the synth for those patches
> Something else Thanks in advance for any suggestions.
>
>