Discussion about the Korg PolySix synthesizer

Hi Friends
I recently did the adjustment procedure and I found two problems.

The first is: not all the leds BANK A-D, PROGRAMS 1-8, MANUAL and TAPE
ENABLE lights up when i turn VR1 from left to right, but every time I
pass a certain point of VR1 leds light up in different combinations.
[[-(]

I have to say that I can proceed to the calibration procedure anyway.
But I don't know If the result of the calibration procedure could be
better if all leds light up instead some of them.

The second i found is that when I regulate MG speed I can't obtain a
cycle of 10-40 sec, but just 4 sec, a very short cycle. [[-(]
For this problem have I to check IC21 and C19?

Any suggestion? [:D]

Thanks

Aniello




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

Are you working on an original KLM-367 or trying to calibrate the clone
board?

Cheers,
Andy

On 05/07/2010 22:26, "aniello.iaccarino" <ani.bliss@gmail.com> wrote:

>
>
>
>
>
> Hi Friends
> I recently did the adjustment procedure and I found two problems.
>
> The first is: not all the leds BANK A-D, PROGRAMS 1-8, MANUAL and TAPE
> ENABLE lights up when i turn VR1 from left to right, but every time I
> pass a certain point of VR1 leds light up in different combinations.
> [[-(]
>
> I have to say that I can proceed to the calibration procedure anyway.
> But I don't know If the result of the calibration procedure could be
> better if all leds light up instead some of them.
>
> The second i found is that when I regulate MG speed I can't obtain a
> cycle of 10-40 sec, but just 4 sec, a very short cycle. [[-(]
> For this problem have I to check IC21 and C19?
>
> Any suggestion? [:D]
>
> Thanks
>
> Aniello
>
> [Non-text portions of this message have been removed]
>
>
>
>
>



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

Hi Andy
I'm working on the original KLM367 board.

Cheers
Aniello

--- In PolySix@yahoogroups.com, Andrew Jury <andy@...> wrote:
>
> Are you working on an original KLM-367 or trying to calibrate the clone
> board?
>
> Cheers,
> Andy
>
>
> On 05/07/2010 22:26, "aniello.iaccarino" <ani.bliss@...> wrote:
>
> >
> >
> >
> >
> >
> > Hi Friends
> > I recently did the adjustment procedure and I found two problems.
> >
> > The first is: not all the leds BANK A-D, PROGRAMS 1-8, MANUAL and TAPE
> > ENABLE lights up when i turn VR1 from left to right, but every time I
> > pass a certain point of VR1 leds light up in different combinations.
> > [[-(]
> >
> > I have to say that I can proceed to the calibration procedure anyway.
> > But I don't know If the result of the calibration procedure could be
> > better if all leds light up instead some of them.
> >
> > The second i found is that when I regulate MG speed I can't obtain a
> > cycle of 10-40 sec, but just 4 sec, a very short cycle. [[-(]
> > For this problem have I to check IC21 and C19?
> >
> > Any suggestion? [:D]
> >
> > Thanks
> >
> > Aniello
> >
> > [Non-text portions of this message have been removed]
> >
> >
> >
> >
> >
>
>
>
> [Non-text portions of this message have been removed]
>

Hi Aniello,

If you are trying to set up Œinit clear¹ (reset) with the 56K resistor on
the test point on the power supply all the LEDS should come on without any
exceptions. You are basically setting the point where /REST on the CPU goes
low. Rotate too far and the output from the comparator is always low and
thus all the LEDs are lit in reset mode. If LEDs are changing from on to off
then I would suggest you have a problem with with data/PIO bus. Start at
connector CN10 and make sure the wiring from here to the KLM 371 (right-hand
top panel PCB) is all sound. If you have a logic probe or a scope you will
find this very usually for measure state on these lines and whether you have
connectivity. If this is a acid damaged repaired 367, then go back and take
a look at track continuity around where the old battery used to be, around
IC30/31 and even under the CPU socket. This is a favourite place for unseen
acid damage to lurk!

I would strongly suggest you look at these problem first before you attend
to the MG issues. IC21 and IC16 (or parts of) form an astable with part of
a a timing constant in C19. However, don¹t forget that IC21 is a
transconductance amplifier and is controlled by a current on pin 16. So you
should also test the controlling circuitry from the demultiplexor downwards,
as well!

Cheers,
Andy

On 08/07/2010 16:28, "aniello iaccarino" <ani.bliss@gmail.com> wrote:

>
>
>
>
>
>
>
> Hi Andy
> I'm working on the original KLM367 board.
>
> Cheers
> Aniello
>
> --- In PolySix@yahoogroups.com <mailto:PolySix%40yahoogroups.com> , Andrew
> Jury <andy@...> wrote:
>> >
>> > Are you working on an original KLM-367 or trying to calibrate the clone
>> > board?
>> >
>> > Cheers,
>> > Andy
>> >
>> >
>> > On 05/07/2010 22:26, "aniello.iaccarino" <ani.bliss@...> wrote:
>> >
>>> > >
>>> > >
>>> > >
>>> > >
>>> > >
>>> > > Hi Friends
>>> > > I recently did the adjustment procedure and I found two problems.
>>> > >
>>> > > The first is: not all the leds BANK A-D, PROGRAMS 1-8, MANUAL and TAPE
>>> > > ENABLE lights up when i turn VR1 from left to right, but every time I
>>> > > pass a certain point of VR1 leds light up in different combinations.
>>> > > [[-(]
>>> > >
>>> > > I have to say that I can proceed to the calibration procedure anyway.
>>> > > But I don't know If the result of the calibration procedure could be
>>> > > better if all leds light up instead some of them.
>>> > >
>>> > > The second i found is that when I regulate MG speed I can't obtain a
>>> > > cycle of 10-40 sec, but just 4 sec, a very short cycle. [[-(]
>>> > > For this problem have I to check IC21 and C19?
>>> > >
>>> > > Any suggestion? [:D]
>>> > >
>>> > > Thanks
>>> > >
>>> > > Aniello
>>> > >
>>> > > [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]

I'll try asap and let you know!
Thanks

Aniello

--- In PolySix@yahoogroups.com, Andrew Jury <andy@...> wrote:
>
> Hi Aniello,
>
> If you are trying to set up Œinit clear¹ (reset) with the 56K resistor on
> the test point on the power supply all the LEDS should come on without any
> exceptions. You are basically setting the point where /REST on the CPU goes
> low. Rotate too far and the output from the comparator is always low and
> thus all the LEDs are lit in reset mode. If LEDs are changing from on to off
> then I would suggest you have a problem with with data/PIO bus. Start at
> connector CN10 and make sure the wiring from here to the KLM 371 (right-hand
> top panel PCB) is all sound. If you have a logic probe or a scope you will
> find this very usually for measure state on these lines and whether you have
> connectivity. If this is a acid damaged repaired 367, then go back and take
> a look at track continuity around where the old battery used to be, around
> IC30/31 and even under the CPU socket. This is a favourite place for unseen
> acid damage to lurk!
>
> I would strongly suggest you look at these problem first before you attend
> to the MG issues. IC21 and IC16 (or parts of) form an astable with part of
> a a timing constant in C19. However, don¹t forget that IC21 is a
> transconductance amplifier and is controlled by a current on pin 16. So you
> should also test the controlling circuitry from the demultiplexor downwards,
> as well!
>
> Cheers,
> Andy
>
> On 08/07/2010 16:28, "aniello iaccarino" <ani.bliss@...> wrote:
>
> >
> >
> >
> >
> >
> >
> >
> > Hi Andy
> > I'm working on the original KLM367 board.
> >
> > Cheers
> > Aniello
> >
> > --- In PolySix@yahoogroups.com <mailto:PolySix%40yahoogroups.com> , Andrew
> > Jury <andy@> wrote:
> >> >
> >> > Are you working on an original KLM-367 or trying to calibrate the clone
> >> > board?
> >> >
> >> > Cheers,
> >> > Andy
> >> >
> >> >
> >> > On 05/07/2010 22:26, "aniello.iaccarino" <ani.bliss@> wrote:
> >> >
> >>> > >
> >>> > >
> >>> > >
> >>> > >
> >>> > >
> >>> > > Hi Friends
> >>> > > I recently did the adjustment procedure and I found two problems.
> >>> > >
> >>> > > The first is: not all the leds BANK A-D, PROGRAMS 1-8, MANUAL and TAPE
> >>> > > ENABLE lights up when i turn VR1 from left to right, but every time I
> >>> > > pass a certain point of VR1 leds light up in different combinations.
> >>> > > [[-(]
> >>> > >
> >>> > > I have to say that I can proceed to the calibration procedure anyway.
> >>> > > But I don't know If the result of the calibration procedure could be
> >>> > > better if all leds light up instead some of them.
> >>> > >
> >>> > > The second i found is that when I regulate MG speed I can't obtain a
> >>> > > cycle of 10-40 sec, but just 4 sec, a very short cycle. [[-(]
> >>> > > For this problem have I to check IC21 and C19?
> >>> > >
> >>> > > Any suggestion? [:D]
> >>> > >
> >>> > > Thanks
> >>> > >
> >>> > > Aniello
> >>> > >
> >>> > > [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]
>

TE is Tape Enable. It should be +5v when not active. If you turn Tape Enable
on, it should go to near 0v.
Don B.

_____

From: PolySix@yahoogroups.com [mailto:PolySix@yahoogroups.com] On Behalf Of
aniello iaccarino
Sent: Saturday, September 18, 2010 10:07 AM
To: PolySix@yahoogroups.com
Subject: [PolySix] Re: Adjustment Procedure problems




Hi Andy
I did a continuity-check between P10 on the KLM 367 board and the relatives
points on the KLM 371

Then I did check P10 pins on KLM 367 with an oscilloscope (with KLM 371 not
connected) and I found this values:

pin1: D3 +/- 5V
pin2: D2 +/- 5V
pin3: D1 +/- 5V
pin4: D0 +/- 5V
pin5: P13 0V
pin6: P12 0V
pin7: P11 0V
pin8: P10 0V
pin9: D4 +/- 5V
pin10: D5 +/- 5V
pin11: D6 +/- 5V
pin12: D7 +/- 5V
pin13: P26 0V
pin14: P27 0V
pin15: +5V
pin16: GND
pin17: TE +5V (what does TE means?)

Are this values regular?

cheers

Aniello

--- In PolySix@yahoogroups.com <mailto:PolySix%40yahoogroups.com> , "aniello
iaccarino" <ani.bliss@...> wrote:

>
> I'll try asap and let you know!
> Thanks
>
> Aniello
>
> --- In PolySix@yahoogroups.com <mailto:PolySix%40yahoogroups.com> , Andrew

Jury <andy@> wrote:

> >
> > Hi Aniello,
> >
> > If you are trying to set up �init clear� (reset) with the 56K resistor

on

> > the test point on the power supply all the LEDS should come on without

any

> > exceptions. You are basically setting the point where /REST on the CPU

goes

> > low. Rotate too far and the output from the comparator is always low and
> > thus all the LEDs are lit in reset mode. If LEDs are changing from on to

off

> > then I would suggest you have a problem with with data/PIO bus. Start at
> > connector CN10 and make sure the wiring from here to the KLM 371

(right-hand

> > top panel PCB) is all sound. If you have a logic probe or a scope you

will

> > find this very usually for measure state on these lines and whether you

have

> > connectivity. If this is a acid damaged repaired 367, then go back and

take

> > a look at track continuity around where the old battery used to be,

around

> > IC30/31 and even under the CPU socket. This is a favourite place for

unseen

> > acid damage to lurk!
> >
> > I would strongly suggest you look at these problem first before you

attend

> > to the MG issues. IC21 and IC16 (or parts of) form an astable with part

of

> > a a timing constant in C19. However, don�t forget that IC21 is a
> > transconductance amplifier and is controlled by a current on pin 16. So

you

> > should also test the controlling circuitry from the demultiplexor

downwards,

> > as well!
> >
> > Cheers,
> > Andy
> >
> > On 08/07/2010 16:28, "aniello iaccarino" <ani.bliss@> wrote:
> >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > Hi Andy
> > > I'm working on the original KLM367 board.
> > >
> > > Cheers
> > > Aniello
> > >
> > > --- In PolySix@yahoogroups.com <mailto:PolySix%40yahoogroups.com>

<mailto:PolySix%40yahoogroups.com> , Andrew

> > > Jury <andy@> wrote:
> > >> >
> > >> > Are you working on an original KLM-367 or trying to calibrate the

clone

> > >> > board?
> > >> >
> > >> > Cheers,
> > >> > Andy
> > >> >
> > >> >
> > >> > On 05/07/2010 22:26, "aniello.iaccarino" <ani.bliss@> wrote:
> > >> >
> > >>> > >
> > >>> > >
> > >>> > >
> > >>> > >
> > >>> > >
> > >>> > > Hi Friends
> > >>> > > I recently did the adjustment procedure and I found two

problems.

> > >>> > >
> > >>> > > The first is: not all the leds BANK A-D, PROGRAMS 1-8, MANUAL

and TAPE

> > >>> > > ENABLE lights up when i turn VR1 from left to right, but every

time I

> > >>> > > pass a certain point of VR1 leds light up in different

combinations.

> > >>> > > [[-(]
> > >>> > >
> > >>> > > I have to say that I can proceed to the calibration procedure

anyway.

> > >>> > > But I don't know If the result of the calibration procedure

could be

> > >>> > > better if all leds light up instead some of them.
> > >>> > >
> > >>> > > The second i found is that when I regulate MG speed I can't

obtain a

> > >>> > > cycle of 10-40 sec, but just 4 sec, a very short cycle. [[-(]
> > >>> > > For this problem have I to check IC21 and C19?
> > >>> > >
> > >>> > > Any suggestion? [:D]
> > >>> > >
> > >>> > > Thanks
> > >>> > >
> > >>> > > Aniello
> > >>> > >
> > >>> > > [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]

Ok the problem should not be on the KLM 371
I checked all "Pxx" and "Dxx" and all works good.

So the problem should be in the KLM 366?

--- In PolySix@yahoogroups.com, "backshall1 \(dsl\)" <backshall1@...> wrote:
>
> TE is Tape Enable. It should be +5v when not active. If you turn Tape Enable
> on, it should go to near 0v.
> Don B.
>
> _____
>
> From: PolySix@yahoogroups.com [mailto:PolySix@yahoogroups.com] On Behalf Of
> aniello iaccarino
> Sent: Saturday, September 18, 2010 10:07 AM
> To: PolySix@yahoogroups.com
> Subject: [PolySix] Re: Adjustment Procedure problems
>
>
>
>
> Hi Andy
> I did a continuity-check between P10 on the KLM 367 board and the relatives
> points on the KLM 371
>
> Then I did check P10 pins on KLM 367 with an oscilloscope (with KLM 371 not
> connected) and I found this values:
>
> pin1: D3 +/- 5V
> pin2: D2 +/- 5V
> pin3: D1 +/- 5V
> pin4: D0 +/- 5V
> pin5: P13 0V
> pin6: P12 0V
> pin7: P11 0V
> pin8: P10 0V
> pin9: D4 +/- 5V
> pin10: D5 +/- 5V
> pin11: D6 +/- 5V
> pin12: D7 +/- 5V
> pin13: P26 0V
> pin14: P27 0V
> pin15: +5V
> pin16: GND
> pin17: TE +5V (what does TE means?)
>
> Are this values regular?
>
> cheers
>
> Aniello
>
> --- In PolySix@yahoogroups.com <mailto:PolySix%40yahoogroups.com> , "aniello
> iaccarino" <ani.bliss@> wrote:
> >
> > I'll try asap and let you know!
> > Thanks
> >
> > Aniello
> >
> > --- In PolySix@yahoogroups.com <mailto:PolySix%40yahoogroups.com> , Andrew
> Jury <andy@> wrote:
> > >
> > > Hi Aniello,
> > >
> > > If you are trying to set up Œinit clear¹ (reset) with the 56K resistor
> on
> > > the test point on the power supply all the LEDS should come on without
> any
> > > exceptions. You are basically setting the point where /REST on the CPU
> goes
> > > low. Rotate too far and the output from the comparator is always low and
> > > thus all the LEDs are lit in reset mode. If LEDs are changing from on to
> off
> > > then I would suggest you have a problem with with data/PIO bus. Start at
> > > connector CN10 and make sure the wiring from here to the KLM 371
> (right-hand
> > > top panel PCB) is all sound. If you have a logic probe or a scope you
> will
> > > find this very usually for measure state on these lines and whether you
> have
> > > connectivity. If this is a acid damaged repaired 367, then go back and
> take
> > > a look at track continuity around where the old battery used to be,
> around
> > > IC30/31 and even under the CPU socket. This is a favourite place for
> unseen
> > > acid damage to lurk!
> > >
> > > I would strongly suggest you look at these problem first before you
> attend
> > > to the MG issues. IC21 and IC16 (or parts of) form an astable with part
> of
> > > a a timing constant in C19. However, don¹t forget that IC21 is a
> > > transconductance amplifier and is controlled by a current on pin 16. So
> you
> > > should also test the controlling circuitry from the demultiplexor
> downwards,
> > > as well!
> > >
> > > Cheers,
> > > Andy
> > >
> > > On 08/07/2010 16:28, "aniello iaccarino" <ani.bliss@> wrote:
> > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > Hi Andy
> > > > I'm working on the original KLM367 board.
> > > >
> > > > Cheers
> > > > Aniello
> > > >
> > > > --- In PolySix@yahoogroups.com <mailto:PolySix%40yahoogroups.com>
> <mailto:PolySix%40yahoogroups.com> , Andrew
> > > > Jury <andy@> wrote:
> > > >> >
> > > >> > Are you working on an original KLM-367 or trying to calibrate the
> clone
> > > >> > board?
> > > >> >
> > > >> > Cheers,
> > > >> > Andy
> > > >> >
> > > >> >
> > > >> > On 05/07/2010 22:26, "aniello.iaccarino" <ani.bliss@> wrote:
> > > >> >
> > > >>> > >
> > > >>> > >
> > > >>> > >
> > > >>> > >
> > > >>> > >
> > > >>> > > Hi Friends
> > > >>> > > I recently did the adjustment procedure and I found two
> problems.
> > > >>> > >
> > > >>> > > The first is: not all the leds BANK A-D, PROGRAMS 1-8, MANUAL
> and TAPE
> > > >>> > > ENABLE lights up when i turn VR1 from left to right, but every
> time I
> > > >>> > > pass a certain point of VR1 leds light up in different
> combinations.
> > > >>> > > [[-(]
> > > >>> > >
> > > >>> > > I have to say that I can proceed to the calibration procedure
> anyway.
> > > >>> > > But I don't know If the result of the calibration procedure
> could be
> > > >>> > > better if all leds light up instead some of them.
> > > >>> > >
> > > >>> > > The second i found is that when I regulate MG speed I can't
> obtain a
> > > >>> > > cycle of 10-40 sec, but just 4 sec, a very short cycle. [[-(]
> > > >>> > > For this problem have I to check IC21 and C19?
> > > >>> > >
> > > >>> > > Any suggestion? [:D]
> > > >>> > >
> > > >>> > > Thanks
> > > >>> > >
> > > >>> > > Aniello
> > > >>> > >
> > > >>> > > [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]
>

Hi Aniello,

I¹d doubt very much if it is the 366 at fault. The data and PIO bus have
transitioning logic states on them so it is not really a good idea doing a
DC check on them as the result are meaningless. You¹d be better off using a
scope or even a logic probe (one with with CMOS and a pulse train setting).
However, having 0v on the whole PIO bus doesn¹t sound good. I can only give
you general advise here as you haven¹t got all the test gear, but if you
have had a battery leak and still have the original blue 40 pin CPU holder
installed it might be worth checking for damage underneath it. I have seen
some very bizarre problems before in the past and have had to resort
removing, cleaning up and then replacing it with a new socket. The
programmable IO bus (P lines) are connected directly to the CPU! If you are
really at the end of your patience with the board and can¹t get any further,
drop me a private message as I may be able to help you.

Cheers,
Andy

On 18/09/2010 19:34, "aniello iaccarino" <ani.bliss@gmail.com> wrote:

>
>
>
>
>
> Ok the problem should not be on the KLM 371
> I checked all "Pxx" and "Dxx" and all works good.
>
> So the problem should be in the KLM 366?
>



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

Hi Andy, thanks for your reply.
Sorry I wrote 366 instead of 367 :)

I checked all the PIO on the CN10 but this time I pressed the relatives buttons during the measurement, for example:

I put the scope on P10 and the level was 0, then I press 1-5-A-Manual and I can see the two logic states on the oscilloscope. I did this for every P on CN10 and all works fine.

So the problem should be on the 367. The board was repaired for the usual acid problem. And the original blue socket too was changed whit one with this kind of pin-holes

http://rocky.digikey.com/weblib/Mill-Max/Web%20Photos/117-93-640-41-005000.jpg

the board was cleaned and the broken tracks wire-jumpered.
I tested all the PIO directly connected from to the CPU to the CN and I can't find any interruption.

I have to say the synth has not any particular problem, every parameter works good. But I'd like to understand the cause of this problem (a firend of mine has this same problem too).

Do you think the problem could be caused by a malfunction of IC3 on 371?
I see P26 and P27 are directly connected on this IC.

Aniello

--- In PolySix@yahoogroups.com, Andrew Jury <andy@...> wrote:
>
> Hi Aniello,
>
> I¹d doubt very much if it is the 366 at fault. The data and PIO bus have
> transitioning logic states on them so it is not really a good idea doing a
> DC check on them as the result are meaningless. You¹d be better off using a
> scope or even a logic probe (one with with CMOS and a pulse train setting).
> However, having 0v on the whole PIO bus doesn¹t sound good. I can only give
> you general advise here as you haven¹t got all the test gear, but if you
> have had a battery leak and still have the original blue 40 pin CPU holder
> installed it might be worth checking for damage underneath it. I have seen
> some very bizarre problems before in the past and have had to resort
> removing, cleaning up and then replacing it with a new socket. The
> programmable IO bus (P lines) are connected directly to the CPU! If you are
> really at the end of your patience with the board and can¹t get any further,
> drop me a private message as I may be able to help you.
>
> Cheers,
> Andy
>
>
> On 18/09/2010 19:34, "aniello iaccarino" <ani.bliss@...> wrote:
>
> >
> >
> >
> >
> >
> > Ok the problem should not be on the KLM 371
> > I checked all "Pxx" and "Dxx" and all works good.
> >
> > So the problem should be in the KLM 366?
> >
>
>
>
> [Non-text portions of this message have been removed]
>

Hi Aniello,

Well it sounds like you have been diligent in your repairs. I just has to go
back and remind myself what your problems were (it¹s been a while now!). Are
you sure that all the LEDs are working / driven? I.e. if you press bank
selection C2 then on the KLM-371 IC3 /3Q should go low and IC4 /2Q should
also do the same. Test them all in turn to verify. Look at the schematic and
all will become clear. Also, I have had a couple of Polysix in the lab with
open circuit LEDs, so don¹t get caught out with that one! Can you confirm
that the bistable latches we talked about above work as per design?

IC3 is part of the MG routing switch, so I don¹t think this is the problem.

Cheers,
Andy

On 19/09/2010 18:13, "aniello iaccarino" <ani.bliss@gmail.com> wrote:

>
>
>
>
>
> Hi Andy, thanks for your reply.
> Sorry I wrote 366 instead of 367 :)
>
> I checked all the PIO on the CN10 but this time I pressed the relatives
> buttons during the measurement, for example:
>
> I put the scope on P10 and the level was 0, then I press 1-5-A-Manual and I
> can see the two logic states on the oscilloscope. I did this for every P on
> CN10 and all works fine.
>
> So the problem should be on the 367. The board was repaired for the usual acid
> problem. And the original blue socket too was changed whit one with this kind
> of pin-holes
>
> http://rocky.digikey.com/weblib/Mill-Max/Web%20Photos/117-93-640-41-005000.jpg
>
> the board was cleaned and the broken tracks wire-jumpered.
> I tested all the PIO directly connected from to the CPU to the CN and I can't
> find any interruption.
>
> I have to say the synth has not any particular problem, every parameter works
> good. But I'd like to understand the cause of this problem (a firend of mine
> has this same problem too).
>
> Do you think the problem could be caused by a malfunction of IC3 on 371?
> I see P26 and P27 are directly connected on this IC.
>
> Aniello
>



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

Hi Andy

well, in normal mode I can select every button on 371 and every relative led lights up.

The example you did was clear, when I press "Bank C" and "Program 2" on the KLM-371 IC3 /3Q (pin 11) goes from 5V to 0v, and IC4 /2Q (pin 14) does the same

Again, if I press Bank Program A-1, pin1 on IC2 and pin1 on IC4 goes from 5V to 0V.


But when I put the dumy resistor on the power supply board to follow the reset procedure, no one LED goes on, except for

"ARPEGGIO - HOLD - CHORD MEMORY - UNISON -POLY

but sometime some of this LED's doesn't go on...it's a quite crazy
thing, despite all everything sounds good in normal mode...

Cheers

Aniello



p.s: what do you mean when you say that IC3 on KLM-371 is part of MG routing switch?
Doesn't IC3 work to power on MANUAL and WRITE LED's and to put 5V into "INA1-2" and "INA3-4" on IC2 IC4 and IC5?

--- In PolySix@yahoogroups.com, Andrew Jury <andy@...> wrote:
>
> Hi Aniello,
>
> Well it sounds like you have been diligent in your repairs. I just has to go
> back and remind myself what your problems were (it¹s been a while now!). Are
> you sure that all the LEDs are working / driven? I.e. if you press bank
> selection C2 then on the KLM-371 IC3 /3Q should go low and IC4 /2Q should
> also do the same. Test them all in turn to verify. Look at the schematic and
> all will become clear. Also, I have had a couple of Polysix in the lab with
> open circuit LEDs, so don¹t get caught out with that one! Can you confirm
> that the bistable latches we talked about above work as per design?
>
> IC3 is part of the MG routing switch, so I don¹t think this is the problem.
>
> Cheers,
> Andy
>
>
> On 19/09/2010 18:13, "aniello iaccarino" <ani.bliss@...> wrote:
>
> >
> >
> >
> >
> >
> > Hi Andy, thanks for your reply.
> > Sorry I wrote 366 instead of 367 :)
> >
> > I checked all the PIO on the CN10 but this time I pressed the relatives
> > buttons during the measurement, for example:
> >
> > I put the scope on P10 and the level was 0, then I press 1-5-A-Manual and I
> > can see the two logic states on the oscilloscope. I did this for every P on
> > CN10 and all works fine.
> >
> > So the problem should be on the 367. The board was repaired for the usual acid
> > problem. And the original blue socket too was changed whit one with this kind
> > of pin-holes
> >
> > http://rocky.digikey.com/weblib/Mill-Max/Web%20Photos/117-93-640-41-005000.jpg
> >
> > the board was cleaned and the broken tracks wire-jumpered.
> > I tested all the PIO directly connected from to the CPU to the CN and I can't
> > find any interruption.
> >
> > I have to say the synth has not any particular problem, every parameter works
> > good. But I'd like to understand the cause of this problem (a firend of mine
> > has this same problem too).
> >
> > Do you think the problem could be caused by a malfunction of IC3 on 371?
> > I see P26 and P27 are directly connected on this IC.
> >
> > Aniello
> >
>
>
>
> [Non-text portions of this message have been removed]
>

Yes, sorry, typing in a rush again. IC3 on the 367 I meant, not the 371...

:-(

On 20/09/2010 13:27, "aniello iaccarino" <ani.bliss@gmail.com> wrote:

> p.s: what do you mean when you say that IC3 on KLM-371 is part of MG routing
> switch?
> Doesn't IC3 work to power on MANUAL and WRITE LED's and to put 5V into
> "INA1-2" and "INA3-4" on IC2 IC4 and IC5?
>



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