Yes, there is an error in the schematics. Pin 5 is +5v, not pin 4. Pin 4
really does go to pin 12 on the 8048. I just checked a clone board and an
old original KLM-367. They are the same.
Don B.
_____
From:
PolySix@yahoogroups.com [mailto:
PolySix@yahoogroups.com] On Behalf Of
Peter Mörck
Sent: Monday, July 23, 2012 8:25 PM
To:
PolySix@yahoogroups.comSubject: Re: [PolySix] Re: Polysix contact strip
You must be looking at the board layout drawing.
The schematics are different and have no "layers". They just show how it's
connected without actual physical constraints.
Anyway, I just looked and pins 1,4,10,13,14 of IC31 are tied to +5V :)
By the way,
I assume there's an error in the schematics indicating pin 4 tied to pin12
of the 8048, as it's also tied to +5V.
Either that's pin 5 instead, or vice versa.
IC31 is just a quad AND gate acting as a buffer. Each of the AND gates has
one of its inputs tied to +5V so whatever appeard on the other input will
also appear on the output of that gate.
The traces under IC31 are usually attacked by the battery acid though and it
is good if you do continuity testing around that area.
BR,
Peter
----- Original Message -----
From: tonezone020
To: PolySix@yahoogroups.com <mailto:PolySix%40yahoogroups.com>
Sent: Tuesday, July 24, 2012 1:45 AM
Subject: [PolySix] Re: Polysix contact strip
Hi,
Looking at the schematics it's hard to tell - it doesn't seem like there is
one for the underside of the board ...
Regards,
Tony
--- In PolySix@yahoogroups.com <mailto:PolySix%40yahoogroups.com> , Peter
Mörck <peterm@...> wrote:
>
> Just compare with the schematics?
>
> BR,
> Peter
>
> ----- Original Message -----
> From: tonezone020
> To: PolySix@yahoogroups.com <mailto:PolySix%40yahoogroups.com>
> Sent: Tuesday, July 24, 2012 12:52 AM
> Subject: [PolySix] Re: Polysix contact strip
>
>
>
> Hi,
>
> Thanks for your message.
>
> I managed to sort the strips out - they had stretched, but with a bit of
coaxing the keys are now working.
>
> Been slowly trying to fix the battery leak problem with a tiny bit of
success and Old Crow's advice from his site.
>
> I discovered pin numbers 13 and 14 on IC31 are connected. Do you know if
this should be so? There seems to be a copper trace on the underneath
circuitry. It also appears to be the same for IC30...
>
> Thanks,
>
> Tony
>
> --- In PolySix@yahoogroups.com <mailto:PolySix%40yahoogroups.com> ,
bastebraak <bastebraak@> wrote:
> >
> >
> >
> > Is the old one damaged or just not working well. I fixed the contacts on
my polysix with a paste i ordered online.
> >
> >
> > Verzonden vanaf Samsung Mobiletonezone020 <swamp.gigs@> schreef:
> > Hi All,
> >
> > Does anyone know where I can get a couple of 6 bubble contact strips or
alternatives for my synth, preferably in the Uk ?
> >
> > Many thanks in advance,
> >
> > Tony
> >
> >
> >
> > ------------------------------------
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
>
>
>
>
>
> [Non-text portions of this message have been removed]
>
[Non-text portions of this message have been removed]
[Non-text portions of this message have been removed]