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

[David G Dixon]

I concur 1000% with MC.  Plus, even just shorting two adjacent pins on some
chips with the careless application of your DMM probe can destroy chips --
I've done it myself, and I design synthesizers!

Leave it to the professionals, lest you end up with a $3000 pile of useless
plastic. 

> -----Original Message-----
> From: synth-diy-bounces at dropmix.xs4all.nl 
> [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of 
> Michael E Caloroso
> Sent: Saturday, February 21, 2015 4:21 PM
> To: tprivitera at nc.rr.com
> Cc: synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] Ideas on resonance problem on single OB-Xa voice
> 
> > 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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