Discussion about the Korg PolySix synthesizer

R74 was salvaged from the old board. The pad you see is the old pad. The new board is fine. I will clean that part up.

- Daniel

--- In PolySix@yahoogroups.com, Andrew Jury <andy@...> wrote:
>
> Hi Daniel,
> 
> I have just been having a really good look at the pictures you posted. The
> right-hand side of R74 looks like the pad sheared away from the board. Might
> be an illusion, but can you check continuity around the this component? If
> it is not is circuit it would certain stop you calibrating it!
> 
> I¹ll carry on look and see what I can see...
> 
> Cheers,
> Andy
> 
> 
> On 21/08/2010 17:23, "Daniel A" <apophis93@...> wrote:
> 
> >  
> >  
> >  
> >    
> > 
> > Thanks Andy for the help.
> > 
> > I am the opposite I prefer Daniel ;)
> > 
> > - Daniel
> > 
> > --- In PolySix@yahoogroups.com <mailto:PolySix%40yahoogroups.com> , Andrew
> > Jury <andy@> wrote:
> >> >
> >> > Hi Daniel,
> >> > 
> >> > Is it Dan or Daniel? I have a friend call Dan and you never call him Daniel
> >> > because he doesn¹t like it!
> >> > 
> >> > Back to business. I see what you mean now I have the picture in front of >>
> me.
> >> > I was looking at the power supply end, hence the mix up.
> >> > 
> >> > The lone wire is to exclusively provide the anode of D1 (MG LED) with +5v.
> >> > The cut in the track is to disconnect this end of the LED from the main +5v
> >> > rail which comes in on a side connector. This looks like a factory mod. All
> >> > my Polys have it! Make sure the lone wire runs from the it¹s current
> >> > location, back to the power supply and disconnect the other wire you have
> >> > added. Don¹t ask me why they chose to run the LED bias voltage on a
> >> separate
> >> > wire? They must have had their reasons...
> >> > 
> >> > As for the Œ367 problems. I will study the pictures in depth in a moment...
> >> > 
> >> > Be back soon...
> >> > 
> >> > Andy
> >> > 
> >> > 
> >> > On 21/08/2010 07:42, "Daniel A" <apophis93@> wrote:
> >> > 
> >>> > >  
> >>> > >  
> >>> > >  
> >>> > >    
> >>> > > 
> >>> > > Andy,
> >>> > > 
> >>> > > Here are links to pics of the Polysix boards in question:
> >>> > > 
> >>> > > 369 : Loose Blue wire and cut trace:
> >>> > > http://www.asurarecords.com/pics/polysix/IMG_1776.JPG
> >>> > > 
> >>> > > 367 :  Here is the build I have been working on, do note that Mouser
> >>> sent some
> >>> > > of the Metal-oxide resistors that are 1/2 watt vs 1/4 watt. There are 4
> >>> > > installed. I may go find 1/4 watt to replace but did not think this
> >>> factor
> >>> > > would affect the board. If I am wrong please let me know ;) If you see
> >>> > > anything else send me a note.
> >>> > > 
> >>> > > http://www.asurarecords.com/pics/polysix/IMG_1779.JPG
> >>> > > http://www.asurarecords.com/pics/polysix/IMG_1794.JPG
> >>> > > http://www.asurarecords.com/pics/polysix/IMG_1795.JPG
> >>> > > http://www.asurarecords.com/pics/polysix/IMG_1796.JPG
> >>> > > 
> >>> > > Thanks!
> >>> > > Daniel
> >>> > > 
> >>> > > --- In PolySix@yahoogroups.com <mailto:PolySix%40yahoogroups.com>
> >>> <mailto:PolySix%40yahoogroups.com> , Andrew
> >>> > > Jury <andy@> wrote:
> >>>>> > >> >
> >>>>> > >> > Daniel,
> >>>>> > >> > 
> >>>>> > >> > Do you mean R2? This is in the MG routing circuit! Suffice to say
> you
> >>>>> > >> > description of the reset adjustment sound correct. If the top panel
> >>>> > >> controls
> >>>>> > >> > are set to default and you switched the Œ367 to test, but you can¹t
> >>>>> get the
> >>>>> > >> > LEDs to positions 1 and 8 then have a very carefully examination of
> the
> >>>>> > >> > circuitry around IC33. If you have a logic probe confirm you have a
> pulse
> >>>>> > >> > train on data bus DO0-7 (pins 5 to 12). Also carefully verify all
> the
> >>>>> > >> > resistive values of the components around IC27 and make sure C28 is
> >>>>> > >> > correctly polarised. Also test the continuity of the test switch!
> If you
> >>>>> > >> > want a second eye on the board take a shot close up and post it for
> us to
> >>>>> > >> > see. Someone eagled eyed might see the problem.
> >>>>> > >> > 
> >>>>> > >> > If you still can¹t spot the problem. Let me know and I will measure
> some
> >>>>> > >> > voltages from a working board for you to compare with.
> >>>>> > >> > 
> >>>>> > >> > On my P6 the blue wire is tacked onto the left-hand side of J2. D1
> >>>>> is part
> >>>>> > >> > of a current limiting circuit before final 5v rail output.
> >>>>> Therefore, D1
> >>>>> > >> > should not be directly connected to the blue wire! The best place
> >>>>> is either
> >>>>> > >> > as I have described or sometime there is a pad on the output 5v
> >>>>> rail in the
> >>>>> > >> > top left-hand corner of the PSU.
> >>>>> > >> > 
> >>>>> > >> > Hope this helps,
> >>>>> > >> > Andy 
> >>> > > 
> >>> > >  
> >>> > >    
> >>> > > 
> >>> > > 
> >> > 
> >> > 
> >> > 
> >> > [Non-text portions of this message have been removed]
> >> >
> > 
> >  
> >    
> > 
> > 
> 
> 
> 
> [Non-text portions of this message have been removed]
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