Discussion about the Korg PolySix synthesizer

Aha! Are you satisfied all the components are in the right place and of the
right value? I keep looking at your board and I can¹t see anything obvious.
Do you want some comparison voltages from a working board so you can gauge
your own readings?

BTW. Don¹t worry about the battery gaff, easy enough mistake to make.
However, make sure that you haven¹t flattened it (i.e. It still gives you 3V
at the terminals).

Cheers,
Andy


On 21/08/2010 20:18, "Daniel A" <apophis93@yahoo.com> wrote:

>  
>  
>  
>    
> 
> 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 <mailto:PolySix%40yahoogroups.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>
>>> <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>
>>>>> > >>> <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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