Discussion about the Korg PolySix synthesizer

Hi polyfriends,

I decided to help my brother to resurrect his p6...

YEEEEEEkkkk: acid!

Ok you know was completely blocked, everywhere, everything...

action taken the OLDCROW procedure:

1) removed battery
2) removed ic30 and 31
3) checked continuity
4) recreated dead traces
5) new lythium battery with diode in place and no more c40
6) new socketed 74ls08 ic30 and ic31


status:

A) all digital control are ok (effect type, waveform, sub ecc ecc)
B) all buttons of the programmer are ok
C) I can see data changing on TP2  (I have no oscilloscope in place,
but only a DM and a Logic probe (I'm not in my lab...))
I can see minimal variation coming out from the comparator (lm393) but
after that, the data is going in the 8748 (T0 pin 1) and is Missing in
Action.
I can see the inhibit working on the 2 4051, that should distribute
the data on the buffers. But data at the output of the buffers is all
blocked (all maximum value seems)

D) Key assigner problem:
every time the p6 is turned on the note #56 (G in last octave) is on
(GATE 0 is on). I need to switch the arpeggio on and off (or jump to
unison and back to poly) to turn the note off.
if an arpeggio is started, that #56 results always on.
Is not a contact problem (I dismounted the keyboard). So seems another
IC problem: Does anybody knows the correct logic test to do to
individuate the faulting IC ?

E) As I have a couple of 8748 and a programmer is the .bin for the p6
available somewhere ? (I'd like to have a backup for the 2 p6)


thank you for your help

antonio

So now the only problem remaining is with the last G key ?
Did you check the diode related with that key in the keyboard 
circuit ?




--- In PolySix@yahoogroups.com, "atuzzi" <antoniotuzzi@...> wrote:
>
> Hi polyfriends,
> 
> I decided to help my brother to resurrect his p6...
> 
> YEEEEEEkkkk: acid!
> 
> Ok you know was completely blocked, everywhere, everything...
> 
> action taken the OLDCROW procedure:
> 
> 1) removed battery
> 2) removed ic30 and 31
> 3) checked continuity
> 4) recreated dead traces
> 5) new lythium battery with diode in place and no more c40
> 6) new socketed 74ls08 ic30 and ic31
> 
> 
> status:
> 
> A) all digital control are ok (effect type, waveform, sub ecc ecc)
> B) all buttons of the programmer are ok
> C) I can see data changing on TP2  (I have no oscilloscope in place,
> but only a DM and a Logic probe (I'm not in my lab...))
> I can see minimal variation coming out from the comparator (lm393) 
but
> after that, the data is going in the 8748 (T0 pin 1) and is Missing 
in
> Action.
> I can see the inhibit working on the 2 4051, that should distribute
> the data on the buffers. But data at the output of the buffers is 
all
> blocked (all maximum value seems)
> 
> D) Key assigner problem:
> every time the p6 is turned on the note #56 (G in last octave) is on
> (GATE 0 is on). I need to switch the arpeggio on and off (or jump to
> unison and back to poly) to turn the note off.
> if an arpeggio is started, that #56 results always on.
> Is not a contact problem (I dismounted the keyboard). So seems 
another
> IC problem: Does anybody knows the correct logic test to do to
> individuate the faulting IC ?
> 
> E) As I have a couple of 8748 and a programmer is the .bin for the 
p6

> available somewhere ? (I'd like to have a backup for the 2 p6)
> 
> 
> thank you for your help
> 
> antonio
>

If you have dismounted the keyboard in the sense that you left the
circuit board connected to the main board but removed the membrane, do
a continuity test to see if the two halves of the pad are engaged. I
had a keyboard once that had a microscopic connection that caused the
connection to be made. 

--- In PolySix@yahoogroups.com, "atuzzi" <antoniotuzzi@...> wrote:

>
> Hi polyfriends,
> 
> I decided to help my brother to resurrect his p6...
> 
> YEEEEEEkkkk: acid!
> 
> Ok you know was completely blocked, everywhere, everything...
> 
> action taken the OLDCROW procedure:
> 
> 1) removed battery
> 2) removed ic30 and 31
> 3) checked continuity
> 4) recreated dead traces
> 5) new lythium battery with diode in place and no more c40
> 6) new socketed 74ls08 ic30 and ic31
> 
> 
> status:
> 
> A) all digital control are ok (effect type, waveform, sub ecc ecc)
> B) all buttons of the programmer are ok
> C) I can see data changing on TP2  (I have no oscilloscope in place,
> but only a DM and a Logic probe (I'm not in my lab...))
> I can see minimal variation coming out from the comparator (lm393) but
> after that, the data is going in the 8748 (T0 pin 1) and is Missing in
> Action.
> I can see the inhibit working on the 2 4051, that should distribute
> the data on the buffers. But data at the output of the buffers is all
> blocked (all maximum value seems)
> 
> D) Key assigner problem:
> every time the p6 is turned on the note #56 (G in last octave) is on
> (GATE 0 is on). I need to switch the arpeggio on and off (or jump to
> unison and back to poly) to turn the note off.
> if an arpeggio is started, that #56 results always on.
> Is not a contact problem (I dismounted the keyboard). So seems another
> IC problem: Does anybody knows the correct logic test to do to
> individuate the faulting IC ?
> 
> E) As I have a couple of 8748 and a programmer is the .bin for the p6
> available somewhere ? (I'd like to have a backup for the 2 p6)
> 
> 
> thank you for your help
> 
> antonio
>

Hello p6ters

I have a new chapter...

1) The Key assigner problem is gone (was not a Key assigner problem!).
2 short circuiting cables connecting the keyboard to the klm366 were
the culprit.



The synths works perfectly in Manual mode, but if I select a memory
patch, I get always the same stupid sounds.
Every time, I create a new sound and I save it (memory enable) if I
reselect it, the sound is gone!

I tried many times to load sounds from TAPE (computer): the procedure seems OK
(correct sequence of lighting LEDs) but no sounds are really charged.

Is this a problem of the 5514 ? Or can be the 4042 latches ?

I really don't know...

thank you
at

On 1/4/07, gmanca101 <gmanca101@yahoo.com> wrote:
>
>
>
>
>
>
> If you have dismounted the keyboard in the sense that you left the
>  circuit board connected to the main board but removed the membrane, do
>  a continuity test to see if the two halves of the pad are engaged. I
>  had a keyboard once that had a microscopic connection that caused the
>  connection to be made.
>
>  --- In PolySix@yahoogroups.com, "atuzzi" <antoniotuzzi@...> wrote:
>  >
>
>  > Hi polyfriends,
>  >
>  > I decided to help my brother to resurrect his p6...
>  >
>  > YEEEEEEkkkk: acid!
>  >
>  > Ok you know was completely blocked, everywhere, everything...
>  >
>  > action taken the OLDCROW procedure:
>  >
>  > 1) removed battery
>  > 2) removed ic30 and 31
>  > 3) checked continuity
>  > 4) recreated dead traces
>  > 5) new lythium battery with diode in place and no more c40
>  > 6) new socketed 74ls08 ic30 and ic31
>  >
>  >
>  > status:
>  >
>  > A) all digital control are ok (effect type, waveform, sub ecc ecc)
>  > B) all buttons of the programmer are ok
>  > C) I can see data changing on TP2  (I have no oscilloscope in place,
>  > but only a DM and a Logic probe (I'm not in my lab...))
>  > I can see minimal variation coming out from the comparator (lm393) but
>  > after that, the data is going in the 8748 (T0 pin 1) and is Missing in
>  > Action.
>  > I can see the inhibit working on the 2 4051, that should distribute
>  > the data on the buffers. But data at the output of the buffers is all
>  > blocked (all maximum value seems)
>  >
>  > D) Key assigner problem:
>  > every time the p6 is turned on the note #56 (G in last octave) is on
>  > (GATE 0 is on). I need to switch the arpeggio on and off (or jump to
>  > unison and back to poly) to turn the note off.
>  > if an arpeggio is started, that #56 results always on.
>  > Is not a contact problem (I dismounted the keyboard). So seems another
>  > IC problem: Does anybody knows the correct logic test to do to
>  > individuate the faulting IC ?
>  >
>  > E) As I have a couple of 8748 and a programmer is the .bin for the p6
>  > available somewhere ? (I'd like to have a backup for the 2 p6)
>  >
>  >
>  > thank you for your help
>  >
>  > antonio
>  >
>
>
>
>