[sdiy] Ideas on resonance problem on single OB-Xa voice

[Michael E Caloroso]

We all have to start somewhere.  If you are not an EE and you want to
learn to fix a synth, then learn it on something simple.  An OB
polysynth is a rocket.  Tim is damn lucky he did not blow
irreplaceable ICs like $$$ CEMs or 3080s.

I have seen too many vintage synths damaged beyond repair due to
novice repair jobs.  Many repairs cannot be fixed over the internet.
Is it so harsh to defer repairs to qualified techs?

MC

On 2/22/15, Rutger Vlek <rutgervlek at gmail.com> wrote:
> Hi MC,
>
> In principle I agree with you, but your message is a bit harsh I think. And
> in this case not exactly appropriate, as Tim seems to be a rather careful
> guy that just likes to learn. We all had our "first times" when fixing a
> synth, didn't we? And we all mess up occasionally (hopefully not too often).
> If we had never attempted, all those synths would be left broken either
> way.
>
> Best,
>
> Rutger
>
> ps. Tim, good to hear! Keep the OB in good shape and enjoy a fine piece of
> synth :).
>
> On 22 feb 2015, at 01:20, Michael E Caloroso wrote:
>
>>> I'm not that good at reading schematics.
>>
>> Please do not try to fix this yourself.  Stop right now and take it to
>> a competent repair tech.  Too many of these wonderful vintage
>> synthesizers have been destroyed by incompetent repair jobs and repair
>> techs are starting to refuse botched DIY repair jobs.  A repair job
>> like this is seldom trivial and cannot be fixed over the internet.  If
>> you cannot grasp complex systems such as polyphonic analog synths or
>> correctly interpret a schematic, you will do more damage and your
>> repair bill will be higher.  The circuits have many complex
>> interactions.  A problem can be deceptive and may actually have
>> another cause somewhere else.  Complex systems need complex tools.  A
>> DMM is going to tell you little.  Oscilloscopes and other test
>> instruments are not easy tools to use and it is easy to use them the
>> wrong way.  "Professional driver" disclaimer...
>>
>> There's a reason these things are labeled NO USER SERVICEABLE PARTS
>> INSIDE.
>>
>> MC
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