Discussion about the Korg PolySix synthesizer

Most likely cause is another bad trace.
Check all the traces to CN06 (D00 - D03;  P10 - P13).
Also keep in mind that these signals each have to connect to several 
points on the board (for example, D00 connects to IC31-6, IC26-4, 
CN06-3, IC28-4, IC34-4, etc etc).

~G

choco wrote:
>
> Hi!
>
> Finnaly I managed to repair it! It was just a track that I cut
> accedentally and was under a printed number on the board (it was
> almost impossible to see it)
>
> Now I've got another problem. The synth sounds ok, it stores the
> presets and so on, but it seems to be a problem with the modulation
> section that it doesn't had before I managed to change the battery.
>
> What happens is: when i switch the P6 on the LFO led starts flashing
> faster and faster and every change of the pots doesn't affect to it.
> Did you encounter this problem before? I've tried to do the Modulation
> adjustment but the VR changes doesn't seem to affect to the signal
> that is delivered to CN03-5. Well, I'm doing it with a digital
> voltimeter which stands to measure Hz, but maybe that's not a good way...
>
> any idea?
>
> Thank you in advance.
>
> --- In PolySix@yahoogroups.com <mailto:PolySix%40yahoogroups.com>, 
> "choco" <ignaciojimenez@...> wrote:
> >
> > Hi-
> >
> > Thank you for your fast and kind reply.
> >
> > I have visited your website several times when doing research for my
> > P6 and I had you in mind as an option if I couldn't work it out. My
> > synth comes from the states and I was bothered about sending it back,
> > but I've never thought before about sending just the board. It's a
> > great option.
> >
> > I'll check one more time that traces and maybe I will re-solder them
> > and the socket more accurately just for testing.
> >
> > Probably I will contact you in a week if I can't arrange to repair it.
> >
> > And maybe I'll think about getting a scope.
> >
> > Thank you!
> >
> > --- In PolySix@yahoogroups.com <mailto:PolySix%40yahoogroups.com>, 
> klosmon <klosmon@> wrote:
> > >
> > > Hello-
> > > Having repaired many of these, I would suggest that the most likely
> > > cause is damaged traces due to the battery leak.
> > > Even if the board looks good, the traces around IC31 (which you
> > > replaced) are VERY delicate, and carry data lines that, if damaged,
> > > effect all of the functions of the synth.
> > >
> > > If you have any experience with electronics, get hold of the
> schematic
> > > and use a continuity tester to test all traces from that IC; if you
> > > have a scope, that's even faster.
> > >
> > > If not, you can send me the CPU board & I can look it over for you.
> > >
> > > ~GMM
> > > analogsynthervice.com
> > >
> > >
> > > choco wrote:
> > > >
> > > > Hi!
> > > >
> > > > After digging within the messages I haven't found any similar
> > > > situation, so I decided to post.
> > > >
> > > > I bought a year ago and old polysix and it sounded fine to me (maybe
> > > > lower than expected, I use it with an old guitar tube amp and I have
> > > > to select the high output with master at 12 o'clock to get it at
> > > > almost the same level as the guitar is)
> > > >
> > > > A mounth ago I noticed that I had lost all my patches (although
> it was
> > > > sounding great and every pot worked fine). I did know about the
> > > > battery issues, but it hadn't worried me until that moment. I opened
> > > > the polysix and noticed that the battery mounting clamps were broken
> > > > and the batery was not feeding the klm367A anymore.
> > > >
> > > > Well, it had leaked a little bit, but the circuit was almost perfect
> > > > and there were no signs of corrosion elsewhere. I cleaned all the
> > > > board with alcohol and care, replaced the battery and the 74LS08N
> > > > which is next to it just for security and then I made a mistake.
> > > >
> > > > I broke a trace and shorted accidentaly 5V and ground.
> > > >
> > > > After testing and noticing what the matter was, I removed that
> mistake
> > > > and everything seemed to work fine (the leds and so on), but when I
> > > > pluged the P6 to an amp (to the earphones too), I noticed that it
> > > > sounded weak and something like distorted. almost every pot didn't
> > > > affect as expected.
> > > >
> > > > Do you have any idea of what can happen to my beloved P6?Any measure
> > > > that I could take from it to get deeper into? Unfortunately I don't
> > > > have an osciloscope to take accurate measures...
> > > >
> > > > I also had a problem with 15Volt line, all the LEDs were ON when
> > > > starting up the P6, but never went OFF. In addition to it, the
> > > > Modulation LFO LED started blinking every time faster and faster
> until
> > > > it seemed to be just static ON. I solved it regulating the 15V
> pot to
> > > > get over 15.05 on my meter.
> > > >
> > > > I will continue testing it, but it seems that I have reached my best
> > > > effort in front of it, and here in Spain it's almost impossible
> > > > finding a qualified vintage synth tech.
> > > >
> > > > Thank you in advance.
> > > >
> > > >
> > >
> > >
> > >
> > > [Non-text portions of this message have been removed]
> > >
> >
>
>  



[Non-text portions of this message have been removed]