Discussion about the Korg PolySix synthesizer

--- In PolySix@yahoogroups.com, Jed Jorgensen <jed.jorgensen@...> wrote:
>
> You will need to be more specific about 'weird'.
> 
> The service manual has the calibration procedure. Have you tried stepping
> through that? As you go through the calibration procedure report back about
> what isn't going correctly. Perhaps we can trouble shoot from there.
> 
> 
> On Wed, Apr 17, 2013 at 10:45 PM, iorlovs <iorlovs@...> wrote:
> 
> > **
> >
> >
> >
> >
> > --- In PolySix@yahoogroups.com, "backshall1" <backshall1@> wrote:
> > >
> > > The VRs look okay. Just a little excess flux on the bottom. These
> > trimmers
> > > are hand-soldered after the rest of the board is complete, so they do not
> > > look as nice as the other solder but they should work okay. IC 31 is
> > ugly.
> > > Remove it and remove the socket it is in, and any excess solder and wires
> > > that were added in the original repair attempt. Put in a new socket and
> > > start checking connections on the data lines (D0 - D7). You can use the
> > > ohm-meter part of your multimeter to check connections from IC31 to all
> > > other chips that it is supposed to connect to. I do not think there is
> > any
> > > way to test IC 24 and 26 with a multimeter. You would need an
> > oscilloscope
> > > to see what is going on. If you need to replace them, the standard part
> > > number is 4011. Always put any new chips in a socket.
> > >
> > > Maybe you should describe to us what kind of problems you hear right now.
> > >
> > > The Q1 pictures are not focused, so I can't tell if it looks bad. If you
> > > have problems with the LFO (MG) after everything else is fixed, it may
> > need
> > > to be replaced.
> > >
> > >
> > >
> > > Don Backshall
> > >
> > >
> > >
> > > _____
> > >
> > > From: PolySix@yahoogroups.com [mailto:PolySix@yahoogroups.com] On
> > Behalf Of
> > > iorlovs
> > > Sent: Thursday, April 11, 2013 5:35 AM
> > > To: PolySix@yahoogroups.com
> > > Subject: [PolySix] Please HELP Korg Polysix KLM367a Repair
> > >
> > >
> > >
> > >
> > >
> > > I bought Korg polysix and want to replace ic31 chip and battery but i
> > have
> > > inspecting KLM 367a board and find bad things
> > > Do i need to replace VR1 to VR 7? (under the board they are looking bad)
> > > IC24 and IC 26 (HD14011BP) corrosion on the one of each legs,do i need to
> > > replace them or just re-solder?
> > > And GR is bad how i can see. (Q1 GR - K30A GR11) (under the board they
> > are
> > > looking bad)
> > > Just want to know what i should replace and where i can find to buy all
> > this
> > > stuff if i need?
> > > Maybe i can test all of them with multimeter?
> > > Here is a pics of board
> > >
> > > http://groups.yahoo.com/group/PolySix/photos/album/1588581670/pic/list
> > >
> > >
> > >
> > >
> > >
> > > [Non-text portions of this message have been removed]
> > >
> >
> > HI!
> > I have putted new socket and new ic31 chip,and repaired all bad tracks and
> > cleaned klm 367a with isopropyl spray called Kontakt IPA. So now program
> > buttons working correctly but its still weird sound from synth. I don't
> > know what should i check now,where can be a problem?Maybe someone have
> > detailed schemes of synth (I have Service manual) or someone know how to
> > check boards for troubleshooting or maybe know weak places of Korg Polysix
> > to tests them.There is a TEST switch on the KLM 367a, what is that,i can
> > test the board with this switch?From where i should start and how to test?
> > Thanks a lot!
> >
> >  
> >
> 
> 
> [Non-text portions of this message have been removed]
>

Calibration procedure its very difficult for me.Outsource i can ask my friend to do that because i think he can and he have oscilloscope.
But if synt is calibrated normally at this moment maybe there is no need to do that