Discussion about the Korg PolySix synthesizer

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@yahoo.com> wrote:

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> 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> , 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 
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