Vintage Synth Repair

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

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

Thanks for your help, I appreciate it. Now I can point the repair 
man in the right direction. 


Cheers,
The Beatbox Gestapo




--- In vintagesynthrepair@yahoogroups.com, "toorglick" 
<toorglick@y...> wrote:
> 
> 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

--- toorglick <toorglick@...> wrote: 
> 
> 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.
> 

Hi

I was very interested in this, I have a Cheetah MS6
that has something similar. Could this fault occur on
an MS6?

Thanks

David Monckton


	
	
		
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