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Discussion about the Korg PolySix synthesizer

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botched trace repair?

botched trace repair?

2007-11-14 by spistrich

well i tried to replace IC 31 and a couple questionably corroded traces
by jumping wires point to point. This was to to solve my polysixes
problem of multiple patch keys LED's on all the time (such as D or #6
or the "write ' key )...well, instead of only 2 being on all the time ,
I now have 4 . Could i have overheated the IC 31?, the continuities all
seem fine, the problem is some dont switch OFF.. could this be
controlled by IC 31? I did possibly heat it too much? there are no 'bad
traces'. left.

Re: [PolySix] botched trace repair?

2007-11-14 by Chromatest J. Pantsmaker

Did you totally remove the "bad" traces, or did you just jump them
with wire? The "bad" traces could still be shorting each other...

Show quoted textHide quoted text
On 11/13/07, spistrich <wasteking@verizon.net> wrote:
> well i tried to replace IC 31 and a couple questionably corroded traces
> by jumping wires point to point. This was to to solve my polysixes
> problem of multiple patch keys LED's on all the time (such as D or #6
> or the "write ' key )...well, instead of only 2 being on all the time ,
> I now have 4 . Could i have overheated the IC 31?, the continuities all
> seem fine, the problem is some dont switch OFF.. could this be
> controlled by IC 31? I did possibly heat it too much? there are no 'bad
> traces'. left.
>
>
>
> PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6
> Yahoo! Groups Links
>
>
>
>


--
.sig
-Chromatest J. Pantsmaker
http://www.chromatest.net

Re: [PolySix] botched trace repair?

2007-11-14 by STEVEN PISTRICH

YES, i scraped out the old traces (about 5), even under the IC31, then replaced the Ic31.... But now that more of the LED s stay on, im more confidant that the IC31 controls selecting the patches, but no one seems to confirm this . I wonder if i need to get another IC31...do it again with less heat applied to the IC when soldering....any other suggestions?


----- Original Message ----
Show quoted textHide quoted text
From: Chromatest J. Pantsmaker <chromatest@azburners.org>
To: PolySix@yahoogroups.com
Sent: Wednesday, November 14, 2007 4:01:37 AM
Subject: Re: [PolySix] botched trace repair?

Did you totally remove the "bad" traces, or did you just jump them
with wire? The "bad" traces could still be shorting each other...

On 11/13/07, spistrich <wasteking@verizon. net> wrote:
> well i tried to replace IC 31 and a couple questionably corroded traces
> by jumping wires point to point. This was to to solve my polysixes
> problem of multiple patch keys LED's on all the time (such as D or #6
> or the "write ' key )...well, instead of only 2 being on all the time ,
> I now have 4 . Could i have overheated the IC 31?, the continuities all
> seem fine, the problem is some dont switch OFF.. could this be
> controlled by IC 31? I did possibly heat it too much? there are no 'bad
> traces'. left.
>
>
>
> PolySix "Digiest" Page: http://www.acc umu.se/~amber/ Poly6
> Yahoo! Groups Links
>
>
>
>

--
.sig
-Chromatest J. Pantsmaker
http://www.chromate st.net



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

Re: [PolySix] botched trace repair?

2007-11-14 by drfuzz@aol.com

I would suggest a new IC.. and a socket to plug it into.


-----Original Message-----
Show quoted textHide quoted text
From: STEVEN PISTRICH <wasteking@verizon.net>
To: PolySix@yahoogroups.com
Sent: Wed, 14 Nov 2007 6:59 am
Subject: Re: [PolySix] botched trace repair?






YES, i scraped out the old traces (about 5), even under the IC31, then replaced the Ic31.... But now that more of the LED s stay on, im more confidant that the IC31 controls selecting the patches, but no one seems to confirm this . I wonder if i need to get another IC31...do it again with less heat applied to the IC when soldering....any other suggestions?

----- Original Message ----
From: Chromatest J. Pantsmaker <chromatest@azburners.org>
To: PolySix@yahoogroups.com
Sent: Wednesday, November 14, 2007 4:01:37 AM
Subject: Re: [PolySix] botched trace repair?

Did you totally remove the "bad" traces, or did you just jump them
with wire? The "bad" traces could still be shorting each other...

On 11/13/07, spistrich <wasteking@verizon. net> wrote:
> well i tried to replace IC 31 and a couple questionably corroded traces
> by jumping wires point to point. This was to to solve my polysixes
> problem of multiple patch keys LED's on all the time (such as D or #6
> or the "write ' key )...well, instead of only 2 being on all the time ,
> I now have 4 . Could i have overheated the IC 31?, the continuities all
> seem fine, the problem is some dont switch OFF.. could this be
> controlled by IC 31? I did possibly heat it too much? there are no 'bad
> traces'. left.
>
>
>
> PolySix "Digiest" Page: http://www.acc umu.se/~amber/ Poly6
> Yahoo! Groups Links
>
>
>
>

--
.sig
-Chromatest J. Pantsmaker
http://www.chromate st.net

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





________________________________________________________________________
Email and AIM finally together. You've gotta check out free AOL Mail! - http://mail.aol.com


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

Re: [PolySix] botched trace repair?

2007-11-14 by STEVEN PISTRICH

My thoughts exactly, ive already ordered the IC AND a socket... ( parts cost under $2) that way i dont have to heat the IC at all....But I still wonder what the IC 31 does, and if it controls the patch selection, etc. Im not joe-pro Tech, but am catching on to some of it... trial and error.


----- Original Message ----
Show quoted textHide quoted text
From: "drfuzz@aol.com" <drfuzz@aol.com>
To: PolySix@yahoogroups.com
Sent: Wednesday, November 14, 2007 1:42:28 PM
Subject: Re: [PolySix] botched trace repair?

I would suggest a new IC.. and a socket to plug it into.

-----Original Message-----
From: STEVEN PISTRICH <wasteking@verizon. net>
To: PolySix@yahoogroups .com
Sent: Wed, 14 Nov 2007 6:59 am
Subject: Re: [PolySix] botched trace repair?

YES, i scraped out the old traces (about 5), even under the IC31, then replaced the Ic31.... But now that more of the LED s stay on, im more confidant that the IC31 controls selecting the patches, but no one seems to confirm this . I wonder if i need to get another IC31...do it again with less heat applied to the IC when soldering... .any other suggestions?

----- Original Message ----
From: Chromatest J. Pantsmaker <chromatest@azburner s.org>
To: PolySix@yahoogroups .com
Sent: Wednesday, November 14, 2007 4:01:37 AM
Subject: Re: [PolySix] botched trace repair?

Did you totally remove the "bad" traces, or did you just jump them
with wire? The "bad" traces could still be shorting each other...

On 11/13/07, spistrich <wasteking@verizon. net> wrote:
> well i tried to replace IC 31 and a couple questionably corroded traces
> by jumping wires point to point. This was to to solve my polysixes
> problem of multiple patch keys LED's on all the time (such as D or #6
> or the "write ' key )...well, instead of only 2 being on all the time ,
> I now have 4 . Could i have overheated the IC 31?, the continuities all
> seem fine, the problem is some dont switch OFF.. could this be
> controlled by IC 31? I did possibly heat it too much? there are no 'bad
> traces'. left.
>
>
>
> PolySix "Digiest" Page: http://www.acc. umu.se/~amber/ Poly6
> Yahoo! Groups Links
>
>
>
>

--
.sig
-Chromatest J. Pantsmaker
http://www.chromate st.net

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

____________ _________ _________ _________ _________ _________ _
Email and AIM finally together. You've gotta check out free AOL Mail! - http://mail. aol.com

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




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

Re: [PolySix] botched trace repair?

2007-11-14 by klosmon

At 01:05 PM 11/14/2007, you wrote:

>My thoughts exactly, ive already ordered the IC AND a socket... (
>parts cost under $2) that way i dont have to heat the IC at
>all....But I still wonder what the IC 31 does, and if it controls
>the patch selection, etc.


Well, I answered that question a few days ago -- see message #1692.
That answer contains good and true information, based on having
repaired about forty polysixes. Not sure what I could add...
~G



--
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.5.503 / Virus Database: 269.15.31/1129 - Release Date: 11/13/2007 9:22 PM

Re: botched trace repair?

2007-11-19 by spistrich

well, i replaced all the bad traces, put in a socket for the IC31
and a new IC31 that had never been heated/soldered into the socket,
established all continuities, and my problem is still
there....The 'write' LED and the LED's for program #4and 6 and D
stay lit. i can also switch between #1,2,3, but i get no response
above #4....Does anyone have an idea if another chip is at fault that
controls these LED's? if its not IC31? --- In
PolySix@yahoogroups.com, klosmon <klosmon@...> wrote:
>
> At 01:05 PM 11/14/2007, you wrote:
>
> >My thoughts exactly, ive already ordered the IC AND a socket... (
> >parts cost under $2) that way i dont have to heat the IC at
> >all....But I still wonder what the IC 31 does, and if it controls
> >the patch selection, etc.
>
>
> Well, I answered that question a few days ago -- see message #1692.
> That answer contains good and true information, based on having
> repaired about forty polysixes. Not sure what I could add...
> ~G
>
>
>
> --
> No virus found in this outgoing message.
> Checked by AVG Free Edition.
> Version: 7.5.503 / Virus Database: 269.15.31/1129 - Release Date:
11/13/2007 9:22 PM
Show quoted textHide quoted text
>

Re: [PolySix] Re: botched trace repair?

2007-11-19 by klosmon

It sounds like you've reached the point where a scope is necessary
for any meaningful work -- this will help you zero in on the problem
areas, and is a much better idea than just replacing ICs at random.
(The Polysix circuit boards aren't that robust to begin with; they
don't stand up to too much desoldering & resoldering. Add to that
the weakening caused by battery damage, and it becomes obvious that
random replacing of components may not work out so well.)

If you can borrow an oscilloscope, view the outputs of IC31 (pins 3,
6, 8 and 11) -- should see strong, consistent signals. Look for the
same on IC30 (same pin numbers) -- these two ICs distribute the data
lines DO0 - DO7 to all the circuitry. Look at the connectors CN06
and CN10 -- see if all "D" and "P" signals are present. If they're
not, this could be the cause of your problem.

As stated before, there isn't just one IC that controls the panel --
it's a matrix of data lines that work together to control a number of things.

Another thought: have you checked the wires that are soldered to the
front panel, right side?

~G
At 08:01 PM 11/18/2007, you wrote:

Show quoted textHide quoted text
>well, i replaced all the bad traces, put in a socket for the IC31
>and a new IC31 that had never been heated/soldered into the socket,
>established all continuities, and my problem is still
>there....The 'write' LED and the LED's for program #4and 6 and D
>stay lit. i can also switch between #1,2,3, but i get no response
>above #4....Does anyone have an idea if another chip is at fault that
>controls these LED's? if its not IC31? --- In
><mailto:PolySix%40yahoogroups.com>PolySix@yahoogroups.com, klosmon
><klosmon@...> wrote:
> >
> > At 01:05 PM 11/14/2007, you wrote:
> >
> > >My thoughts exactly, ive already ordered the IC AND a socket... (
> > >parts cost under $2) that way i dont have to heat the IC at
> > >all....But I still wonder what the IC 31 does, and if it controls
> > >the patch selection, etc.
> >
> >
> > Well, I answered that question a few days ago -- see message #1692.
> > That answer contains good and true information, based on having
> > repaired about forty polysixes. Not sure what I could add...
> > ~G
> >
> >
> >
> > --
> > No virus found in this outgoing message.
> > Checked by AVG Free Edition.
> > Version: 7.5.503 / Virus Database: 269.15.31/1129 - Release Date:
>11/13/2007 9:22 PM
> >
>
>
>
>No virus found in this incoming message.
>Checked by AVG Free Edition.
>Version: 7.5.503 / Virus Database: 269.16.0/1136 - Release Date:
>11/17/2007 2:55 PM

----------



No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.5.503 / Virus Database: 269.16.0/1136 - Release Date: 11/17/2007 2:55 PM


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

Re: [PolySix] Re: botched trace repair?

2007-12-09 by jure zitnik

don't get too excited but there could be another explanation:

the last (and like 3rd) time i decided to repair my polysix i found
something really funny. i completely removed like 20 traces and
rewired everything back up, replaced IC30 and IC31 and also replaced
the main CPU (ic40 i think). just so i could be sure that this time is
the last time i have her open. i also removed the pattern/bank keys
frontpanel and checked some connections there. and then i assembled
the whole thing back... and the pattern 3 + bank D were lit when i
turned the synth on. and the arp light also.

then it took me a few more hours to find out that the key panels were
screwed too tightly, so a few keys were pressed constantly. seriously.
mine works flawlessly now.

cheers,
jure

Show quoted textHide quoted text
On Nov 19, 2007 5:34 AM, klosmon <klosmon@sbcglobal.net> wrote:
> It sounds like you've reached the point where a scope is necessary
> for any meaningful work -- this will help you zero in on the problem
> areas, and is a much better idea than just replacing ICs at random.
> (The Polysix circuit boards aren't that robust to begin with; they
> don't stand up to too much desoldering & resoldering. Add to that
> the weakening caused by battery damage, and it becomes obvious that
> random replacing of components may not work out so well.)
>
> If you can borrow an oscilloscope, view the outputs of IC31 (pins 3,
> 6, 8 and 11) -- should see strong, consistent signals. Look for the
> same on IC30 (same pin numbers) -- these two ICs distribute the data
> lines DO0 - DO7 to all the circuitry. Look at the connectors CN06
> and CN10 -- see if all "D" and "P" signals are present. If they're
> not, this could be the cause of your problem.
>
> As stated before, there isn't just one IC that controls the panel --
> it's a matrix of data lines that work together to control a number of things.
>
> Another thought: have you checked the wires that are soldered to the
> front panel, right side?
>
> ~G
> At 08:01 PM 11/18/2007, you wrote:
>
> >well, i replaced all the bad traces, put in a socket for the IC31
> >and a new IC31 that had never been heated/soldered into the socket,
> >established all continuities, and my problem is still
> >there....The 'write' LED and the LED's for program #4and 6 and D
> >stay lit. i can also switch between #1,2,3, but i get no response
> >above #4....Does anyone have an idea if another chip is at fault that
> >controls these LED's? if its not IC31? --- In
> ><mailto:PolySix%40yahoogroups.com>PolySix@yahoogroups.com, klosmon
> ><klosmon@...> wrote:
> > >
> > > At 01:05 PM 11/14/2007, you wrote:
> > >
> > > >My thoughts exactly, ive already ordered the IC AND a socket... (
> > > >parts cost under $2) that way i dont have to heat the IC at
> > > >all....But I still wonder what the IC 31 does, and if it controls
> > > >the patch selection, etc.
> > >
> > >
> > > Well, I answered that question a few days ago -- see message #1692.
> > > That answer contains good and true information, based on having
> > > repaired about forty polysixes. Not sure what I could add...
> > > ~G
> > >
> > >
> > >
> > > --
> > > No virus found in this outgoing message.
> > > Checked by AVG Free Edition.
> > > Version: 7.5.503 / Virus Database: 269.15.31/1129 - Release Date:
> >11/13/2007 9:22 PM
> > >
> >
> >
> >
> >No virus found in this incoming message.
> >Checked by AVG Free Edition.
> >Version: 7.5.503 / Virus Database: 269.16.0/1136 - Release Date:
> >11/17/2007 2:55 PM
>
> ----------
>
>
>
> No virus found in this outgoing message.
> Checked by AVG Free Edition.
> Version: 7.5.503 / Virus Database: 269.16.0/1136 - Release Date: 11/17/2007 2:55 PM
>
>
> [Non-text portions of this message have been removed]
>
>
>
>
> PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6
> Yahoo! Groups Links
>
>
>
>