Vintage Synth Repair

MKS-30, beautiful sounding box.  Unfortunately, it uses the same 
chips that the Juno106 does, and thus can succumb to the dreaded 
vca/vcf failure.  Have you done any diagnostics to determine which 
voices are failing?  Just because you change a patch, it doesn't mean 
different voices are failing.

Do a chromatic run up the keyboard and see if different notes fail.  
It should be in the order of every 2 voices fail, and should not be 
related to the actual notes you're playing.



--- In vintagesynthrepair@yahoogroups.com, "beatboxgestapo" 
<beatboxgestapo@y...> wrote:
> 
> Hi, 
> 
> I have a Roland MKS-30 that is acting weird. I am hoping someone 
> here can help me with it.
> 
> I use a Roland A-33 controller with my MKS-30.
>  
> The problem is when playing a patch from the MKS-30, certain keys 
do 
> not sound when they are pressed. If I change to a new patch, those 
> notes will now sound, but others will not. It is a very random 
thing 
> each time I use it.( only a few notes on the keyboard will not 
> sound, but they are always different.)
> For instance it is sometimes a "D" and an "F", then I change the 
> patch, and it is a "G" and a "E" that do not sound .
> I have other Roland sound modules, and do not experience the same 
> thing with them (so I know it is not the A-33 controller ).
> I also used another midi keyboard to control the MKS-30 and still 
> have the same problem.
>  
> Has anyone ever experienced this problem, or heard about this 
> happening to MKS-30 users ?
> Any assistance is greatly appreciated.
> 
> Thanks,
> The Beatbox Gestapo