Discussion about the Korg PolySix synthesizer

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, 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]
>