Discussion about the Korg PolySix synthesizer

I'll try asap and let you know!
Thanks

Aniello

--- In PolySix@yahoogroups.com, Andrew Jury <andy@...> wrote:
>
> Hi Aniello,
> 
> If you are trying to set up Œinit clear¹ (reset) with the 56K resistor on
> the test point on the power supply all the LEDS should come on without any
> exceptions. You are basically setting the point where /REST on the CPU goes
> low. Rotate too far and the output from the comparator is always low and
> thus all the LEDs are lit in reset mode. If LEDs are changing from on to off
> then I would suggest you have a problem with with data/PIO bus. Start at
> connector CN10 and make sure the wiring from here to the KLM 371 (right-hand
> top panel PCB) is all sound. If you have a logic probe or a scope you will
> find this very usually for measure state on these lines and whether you have
> connectivity. If this is a acid damaged repaired 367, then go back and take
> a look at track continuity around where the old battery used to be, around
> IC30/31 and even under the CPU socket. This is a favourite place for unseen
> acid damage to lurk!
> 
> I would strongly suggest you look at these problem first before you attend
> to the MG issues.  IC21 and IC16 (or parts of) form an astable with part of
> a a timing constant in C19. However, don¹t forget that IC21 is a
> transconductance amplifier and is controlled by a current on pin 16. So you
> should also test the controlling circuitry from the demultiplexor downwards,
> as well!
> 
> Cheers,
> Andy 
> 
> On 08/07/2010 16:28, "aniello iaccarino" <ani.bliss@...> wrote:
> 
> >  
> >  
> >  
> >    
> > 
> > 
> > 
> > Hi Andy
> > I'm working on the original KLM367 board.
> > 
> > Cheers
> > Aniello
> > 
> > --- In PolySix@yahoogroups.com <mailto:PolySix%40yahoogroups.com> , Andrew
> > Jury <andy@> wrote:
> >> >
> >> > Are you working on an original KLM-367 or trying to calibrate the clone
> >> > board?
> >> > 
> >> > Cheers,
> >> > Andy
> >> > 
> >> > 
> >> > On 05/07/2010 22:26, "aniello.iaccarino" <ani.bliss@> wrote:
> >> > 
> >>> > >  
> >>> > >  
> >>> > >  
> >>> > >    
> >>> > > 
> >>> > > Hi Friends
> >>> > > I recently did the adjustment procedure and I found two problems.
> >>> > > 
> >>> > > The first is: not all the leds BANK A-D, PROGRAMS 1-8, MANUAL and TAPE
> >>> > > ENABLE lights up when i turn VR1 from left to right, but every time I
> >>> > > pass a certain point of VR1 leds light up in different combinations.
> >>> > > [[-(]
> >>> > > 
> >>> > > I have to say that I can proceed to the calibration procedure anyway.
> >>> > > But I don't know If the result of the calibration procedure  could be
> >>> > > better if all leds light up instead some of them.
> >>> > > 
> >>> > > The second i found is that when I regulate MG speed I can't obtain a
> >>> > > cycle of 10-40 sec, but just 4 sec,  a very short cycle.  [[-(]
> >>> > > For this problem have I to check IC21 and C19?
> >>> > > 
> >>> > > Any suggestion?  [:D]
> >>> > > 
> >>> > > Thanks
> >>> > > 
> >>> > > Aniello
> >>> > > 
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> >>> > > 
> >>> > >  
> >>> > >    
> >>> > > 
> >>> > > 
> >> > 
> >> > 
> >> > 
> >> > [Non-text portions of this message have been removed]
> >> >
> > 
> >  
> >    
> > 
> > 
> 
> 
> 
> [Non-text portions of this message have been removed]
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