[sdiy] Polysix keys

Gil W. gil_we at yahoo.com
Thu Jan 17 23:19:23 CET 2008 

There used to be times when Old Crow would made new
boards based on the parts taken from the defected
boards. Recreating the board is still a great
solution. Does anyone hold the layout for the board,
on which it should be possible to have a PCB made ?



--- GRAHAM ATKINS <gatkins at blueyonder.co.uk> wrote:

> I can recall at some time in the past being able to
> buy conductive  
> rubber contacts as a sheet that
> could be cut to size to suit any application. That
> might be ideal if  
> nothing else works but sadly I can't
> remember seeing any recently, but thats not to say
> there may be some  
> out there.
> 
> Graham
> On Jan 16, 2008, at 4:18, Bob Weigel wrote:
> 
> > WHen the traces start to get fried around the
> battery a lot of  
> > things can be affected indeed.
> >
> > The contacts are weird on these things.
> Occasionally you have ones  
> > that just didn't get enough of the conductive part
> in the mix and  
> > they only conduct on the very surface and once
> it's worn they are  
> > done.  I've seen lots  of them (as in production
> 'lots'...lot  
> > numbers except without any numbers :-) ) I believe
> that are more  
> > susceptable to this problem. I'd like to get some
> of the stuff that  
> > you can coat on them to rejouvinate them but the
> web sites seem DEAD  
> > that sell this stuff.  Fill out the form, get a
> bogus error message.
> >
> > Anyway on occasion you can remove a tiny amount of
> the rubber with  
> > acetone rub down.  It doesn't always work but does
> sometimes if it's  
> > just a glazed surface problem.  Other times I'm
> scaled them down  
> > some and gotten them working again.  But IN
> GENERAL you should be  
> > able to lay probes on them and get below 600 ohms
> pressing them side  
> > by side flat ways.  Fine probes of course.  If you
> get 1000 they are  
> > probably going to be sporratic or delayed
> contacts.  If 2000 they  
> > probably won't work at all.  400 or less is
> typical for really good  
> > ones.
> >
> > I just got a polysix in that the guy used plastic
> bags for end  
> > padding.  I kid you not.  I went over it with him
> but he was in a  
> > hurry and just did the stupid thing.  Both ends
> cracked in half.   
> > I'll have to makes some oak ends to get the dollar
> out of that one.   
> > Was a decent unit before that happened to it.  But
> I got it with an  
> > analog and digital board extra for 330 I think it
> was and he gave me  
> > 50 back for the bungle so I should come out good
> on it. -Bob
> > Tom Wiltshire wrote:
> >
> >> The other likely faults on a sick polysix beyond
> the already-  
> >> mentioned battery leakage are:
> >>
> >> 1) The bank and program switches. These tend to
> lose their caps  
> >> and  often the switches themselves pack up too.
> >> 2) The keyboard contacts. These suffer like many
> cheap rubber- 
> >> contact  keyboards, and repairs are done the same
> way - careful  
> >> cleaning and  perhaps treatment with one of the
> products designed  
> >> for the purpose.
> >>
> >> It's amazing how many other weird faults on a
> polysix can actually  
> >> be  due to battery leakage though - I've seen the
> sub oscillator   
> >> disappear, and the PWM only act as PW, for
> example.
> >>
> >> The voice and effects boards actually seem to be
> pretty reliable,  
> >> and  the power supplies aren't bad either.
> >>
> >> Can anyone else think of anything else that I've
> forgotten?
> >>
> >> T.
> >>
> >>
> >> On 15 Jan 2008, at 20:23, Bob Weigel wrote:
> >>
> >>> The low C is the same as all other C's.  The
> HIGH C is full width   
> >>> and unique.  I only have one in stock and
> thought it was spoken   
> >>> for. -Bob
> >>>
> >>> Sean Ellis wrote:
> >>>
> >>>> Thanks for all the replies guys! Got quite a
> few offers but I  
> >>>> need  the
> >>>> lowest C key, it appears the end keys are
> different to the rest.
> >>>>
> >>>> -----Original Message-----
> >>>> From: synth-diy-bounces at dropmix.xs4all.nl
> >>>> [mailto:synth-diy-bounces at dropmix.xs4all.nl] On
> Behalf Of Martin   
> >>>> Pavlas
> >>>> Sent: Monday, January 14, 2008 9:00 PM
> >>>> To: synth-diy at dropmix.xs4all.nl
> >>>> Subject: Re: [sdiy] Polysix keys
> >>>>
> >>>> Hi,
> >>>>
> >>>> Senso from www.vintageplanet.nl seems to have
> them. Check that out.
> >>>>
> >>>> -- 
> >>>> martin
> >>>>
> >>>>
> >>>>
> >>>> Sean Ellis wrote:
> >>>>
> >>>>> I am picking up a sick polysix that is missing
> a key and has  
> >>>>> some  other unknown problems, probably due to
> battery leakage.  
> >>>>> Does  anyone know a source for a replacement
> key?
> >>>>>
> >>>>> It's great to have Scott Rider's excellent
> polysix repair page   
> >>>>> (here:
> http://www.oldcrows.net/~oldcrow/synth/korg/polysix/
>  
> >>>>> index.html ), looks like I'll be needing it
> very soon :) Not  
> >>>>> sure  if Scott is on this list but I'm curious
> about the missing  
> >>>>> page  labeled "Give your Polysix a Korg
> PS3100-Style Triple  
> >>>>> resonant  filter". Sounds very interesting but
> the schematics  
> >>>>> for the  Polysix are a nightmare to read.
> >>>>>
> >>>>>
> >>>>>
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