Discussion about the Korg PolySix synthesizer

Hello guys,

I've bought a polysix in quite a good shape but electronically non functional, so i started to troubleshoot.

At first power, there are 3 voices comming up, sometimes one, at each start and they seem to have the same pitch. Modulation and Bend works. Tune knob works. Except these, the bank lights come up heratically.

Adjusted the power supply to be +15, - 15, +5 on the spot.

I noticed 2 of the 4 latches chip 74ls75 on the panel board were marked by somebody with an X so I figured these need changing.

Keyboard seems to affect the pitch slighly when pressing more than 3, 4 keys.

Arpegiator led is flashing and rate is adjustable.

My guess is the KLM 367 is causing the problems, so i verified the traces around IC 31 and resolder them back in place.

Now, I have no idea how to check wheter the CPU, RAM, DAC or LM13600 are working fine, but I probed the CPU using an Oscilloscope and the clock was there at 6mhz, and on some other pin there seem to be data flowing.

Somebody with more experience to privide guidance ?

Hello,

I've did some tests today and here;s what i found:

TO CONFIRM: cpu seems to be working fine since i was able to see the clock on TP4 on osciloscope. Strege thing that somebody mentioned the gap should be 20 ms and i meassured 10ms. Is this ok ? Also the TP2 spot looks ok - The multiplexed signal from the pots it is there.

PROBLEM: there cpu starts randomnly. A few power off - power on cycles are necesary to get the clock there. I this this is related of the bad 4 x 74ls75 found on the control panel board. Two of these latches seem to be dead.

PROBLEM: Altoought there is sound presend, and lfo, cutoff, and all the other pots are working, the sound is non interupted, very loud and at a rather high pitch. voice 6, 5, 4 diode leds are light up, and the sound resemnbles like a few vco beeing active. the other 3 leds, for voice 1, 2, 3 are off. touching the keyboard changes the pitch slighly but then resumes the state before. I'm suspecting the latches: 74ls75

QUESTION: how to test the key assigner cpu ? Is there a method simillar to the uC found on KLM 367 ?

Thanks for support guys.

Razvan

nobody ?

--- In PolySix@yahoogroups.com, "arpm234" <arpm234@...> wrote:
>
> Hello,
>
> I've did some tests today and here;s what i found:
>
> TO CONFIRM: cpu seems to be working fine since i was able to see the clock on TP4 on osciloscope. Strege thing that somebody mentioned the gap should be 20 ms and i meassured 10ms. Is this ok ? Also the TP2 spot looks ok - The multiplexed signal from the pots it is there.
>
> PROBLEM: there cpu starts randomnly. A few power off - power on cycles are necesary to get the clock there. I this this is related of the bad 4 x 74ls75 found on the control panel board. Two of these latches seem to be dead.
>
> PROBLEM: Altoought there is sound presend, and lfo, cutoff, and all the other pots are working, the sound is non interupted, very loud and at a rather high pitch. voice 6, 5, 4 diode leds are light up, and the sound resemnbles like a few vco beeing active. the other 3 leds, for voice 1, 2, 3 are off. touching the keyboard changes the pitch slighly but then resumes the state before. I'm suspecting the latches: 74ls75
>
> QUESTION: how to test the key assigner cpu ? Is there a method simillar to the uC found on KLM 367 ?
>
> Thanks for support guys.
>
> Razvan
>

Hi Razvan,

I think there are two different problemes:
- KLM367 CPU not starting
- KLM366 Key Assigner behaving wierd

First thing ist to make the KLM-367 CPU start reliable. Check the power
supply for correct voltages and perform the reset circuit adjustment
procedure given in the service manual.
The test pulse at TP4 *is* in 20msec intervals. The pulse itself is
very short.
Check the resonator frequency at IC22 (CPU) pin 3. It should be ca 6MHz.

Second: The KLM-366 has a test mode as well. "It is started by jumpering
pins DB7 and P17 using a diode (cathode towards DB7) on the 8049
processor on the KLM-366 circuit board (this can be done on the
keyboard connector CN04). In this mode the CV DAC is set to generate
0V, 2.5V, or 5V depending on the position of the OCTAVE switch (16'
results in 0V, etc.)".
You can check this voltage at KLM366/IC9/pin1.
Check the reset signal. KLM-366 is in reset when switching to Tape
Interface mode. Check the resonator frequency. It should be like on
KLM-367 6MHz at CPU pin 3.

Do the buttons behave normally? (Porbably not...)
The BANK, MANUAL, and PROGRAM buttons operate on the KLM-367 Programmer
CPU, whereas the ARP, HOLD, UNISON, CHORD MEM, and POLY buttons operate
on the KLM-366 CPU.

Good luck,

Johannes

On 2012-12-04 20:27, arpm234 wrote:
> nobody ?
>
> --- In PolySix@yahoogroups.com, "arpm234" <arpm234@...> wrote:
>>
>> Hello,
>>
>> I've did some tests today and here;s what i found:
>>
>> TO CONFIRM: cpu seems to be working fine since i was able to see the clock on TP4 on osciloscope. Strege thing that somebody mentioned the gap should be 20 ms and i meassured 10ms. Is this ok ? Also the TP2 spot looks ok - The multiplexed signal from the pots it is there.
>>
>> PROBLEM: there cpu starts randomnly. A few power off - power on cycles are necesary to get the clock there. I this this is related of the bad 4 x 74ls75 found on the control panel board. Two of these latches seem to be dead.
>>
>> PROBLEM: Altoought there is sound presend, and lfo, cutoff, and all the other pots are working, the sound is non interupted, very loud and at a rather high pitch. voice 6, 5, 4 diode leds are light up, and the sound resemnbles like a few vco beeing active. the other 3 leds, for voice 1, 2, 3 are off. touching the keyboard changes the pitch slighly but then resumes the state before. I'm suspecting the latches: 74ls75
>>
>> QUESTION: how to test the key assigner cpu ? Is there a method simillar to the uC found on KLM 367 ?
>>
>> Thanks for support guys.
>>
>> Razvan
>>
>
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>
>

Hey Johannes,

Thanks a lot for the ideas. I've tested this morning the RESET signal of the main cpu and whatever i did, there were constantly 4.6 v there so by following the schematics I noticed it linked to the comparator IC5, LM393 which was bad in a way that pin 7 (output) and pin 8 (vcc) were internally shorted.

Replaced that and everything came to live. Including keyboard and tones.

NOW, There are still things to figure out.

1. Arpeggiator not working.
2. There is a noise around 22khz at output, like a self resonant thing like an old tube while functioning or like a camera flash when charging. very annoying.
3. each and every voice may need calibrating as each one is different in volume, pitch or filter. are there any guidelines for this?

thanks again.

Razvan

--- In PolySix@yahoogroups.com, Johannes Hausensteiner <johau@...> wrote:
>
> Hi Razvan,
>
> I think there are two different problemes:
> - KLM367 CPU not starting
> - KLM366 Key Assigner behaving wierd
>
> First thing ist to make the KLM-367 CPU start reliable. Check the power
> supply for correct voltages and perform the reset circuit adjustment
> procedure given in the service manual.
> The test pulse at TP4 *is* in 20msec intervals. The pulse itself is
> very short.
> Check the resonator frequency at IC22 (CPU) pin 3. It should be ca 6MHz.
>
> Second: The KLM-366 has a test mode as well. "It is started by jumpering
> pins DB7 and P17 using a diode (cathode towards DB7) on the 8049
> processor on the KLM-366 circuit board (this can be done on the
> keyboard connector CN04). In this mode the CV DAC is set to generate
> 0V, 2.5V, or 5V depending on the position of the OCTAVE switch (16'
> results in 0V, etc.)".
> You can check this voltage at KLM366/IC9/pin1.
> Check the reset signal. KLM-366 is in reset when switching to Tape
> Interface mode. Check the resonator frequency. It should be like on
> KLM-367 6MHz at CPU pin 3.
>
> Do the buttons behave normally? (Porbably not...)
> The BANK, MANUAL, and PROGRAM buttons operate on the KLM-367 Programmer
> CPU, whereas the ARP, HOLD, UNISON, CHORD MEM, and POLY buttons operate
> on the KLM-366 CPU.
>
> Good luck,
>
> Johannes
>
>
>
> On 2012-12-04 20:27, arpm234 wrote:
> > nobody ?
> >
> > --- In PolySix@yahoogroups.com, "arpm234" <arpm234@> wrote:
> >>
> >> Hello,
> >>
> >> I've did some tests today and here;s what i found:
> >>
> >> TO CONFIRM: cpu seems to be working fine since i was able to see the clock on TP4 on osciloscope. Strege thing that somebody mentioned the gap should be 20 ms and i meassured 10ms. Is this ok ? Also the TP2 spot looks ok - The multiplexed signal from the pots it is there.
> >>
> >> PROBLEM: there cpu starts randomnly. A few power off - power on cycles are necesary to get the clock there. I this this is related of the bad 4 x 74ls75 found on the control panel board. Two of these latches seem to be dead.
> >>
> >> PROBLEM: Altoought there is sound presend, and lfo, cutoff, and all the other pots are working, the sound is non interupted, very loud and at a rather high pitch. voice 6, 5, 4 diode leds are light up, and the sound resemnbles like a few vco beeing active. the other 3 leds, for voice 1, 2, 3 are off. touching the keyboard changes the pitch slighly but then resumes the state before. I'm suspecting the latches: 74ls75
> >>
> >> QUESTION: how to test the key assigner cpu ? Is there a method simillar to the uC found on KLM 367 ?
> >>
> >> Thanks for support guys.
> >>
> >> Razvan
> >>
> >
> >
> >
> >
> > ------------------------------------
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
>

Hi,

Guidelines for calibrating each voice are in the service manual...

T

--- In PolySix@yahoogroups.com, "arpm234" <arpm234@...> wrote:
>
> Hey Johannes,
>
> Thanks a lot for the ideas. I've tested this morning the RESET signal of the main cpu and whatever i did, there were constantly 4.6 v there so by following the schematics I noticed it linked to the comparator IC5, LM393 which was bad in a way that pin 7 (output) and pin 8 (vcc) were internally shorted.
>
> Replaced that and everything came to live. Including keyboard and tones.
>
> NOW, There are still things to figure out.
>
> 1. Arpeggiator not working.
> 2. There is a noise around 22khz at output, like a self resonant thing like an old tube while functioning or like a camera flash when charging. very annoying.
> 3. each and every voice may need calibrating as each one is different in volume, pitch or filter. are there any guidelines for this?
>
> thanks again.
>
> Razvan
>
> --- In PolySix@yahoogroups.com, Johannes Hausensteiner <johau@> wrote:
> >
> > Hi Razvan,
> >
> > I think there are two different problemes:
> > - KLM367 CPU not starting
> > - KLM366 Key Assigner behaving wierd
> >
> > First thing ist to make the KLM-367 CPU start reliable. Check the power
> > supply for correct voltages and perform the reset circuit adjustment
> > procedure given in the service manual.
> > The test pulse at TP4 *is* in 20msec intervals. The pulse itself is
> > very short.
> > Check the resonator frequency at IC22 (CPU) pin 3. It should be ca 6MHz.
> >
> > Second: The KLM-366 has a test mode as well. "It is started by jumpering
> > pins DB7 and P17 using a diode (cathode towards DB7) on the 8049
> > processor on the KLM-366 circuit board (this can be done on the
> > keyboard connector CN04). In this mode the CV DAC is set to generate
> > 0V, 2.5V, or 5V depending on the position of the OCTAVE switch (16'
> > results in 0V, etc.)".
> > You can check this voltage at KLM366/IC9/pin1.
> > Check the reset signal. KLM-366 is in reset when switching to Tape
> > Interface mode. Check the resonator frequency. It should be like on
> > KLM-367 6MHz at CPU pin 3.
> >
> > Do the buttons behave normally? (Porbably not...)
> > The BANK, MANUAL, and PROGRAM buttons operate on the KLM-367 Programmer
> > CPU, whereas the ARP, HOLD, UNISON, CHORD MEM, and POLY buttons operate
> > on the KLM-366 CPU.
> >
> > Good luck,
> >
> > Johannes
> >
> >
> >
> > On 2012-12-04 20:27, arpm234 wrote:
> > > nobody ?
> > >
> > > --- In PolySix@yahoogroups.com, "arpm234" <arpm234@> wrote:
> > >>
> > >> Hello,
> > >>
> > >> I've did some tests today and here;s what i found:
> > >>
> > >> TO CONFIRM: cpu seems to be working fine since i was able to see the clock on TP4 on osciloscope. Strege thing that somebody mentioned the gap should be 20 ms and i meassured 10ms. Is this ok ? Also the TP2 spot looks ok - The multiplexed signal from the pots it is there.
> > >>
> > >> PROBLEM: there cpu starts randomnly. A few power off - power on cycles are necesary to get the clock there. I this this is related of the bad 4 x 74ls75 found on the control panel board. Two of these latches seem to be dead.
> > >>
> > >> PROBLEM: Altoought there is sound presend, and lfo, cutoff, and all the other pots are working, the sound is non interupted, very loud and at a rather high pitch. voice 6, 5, 4 diode leds are light up, and the sound resemnbles like a few vco beeing active. the other 3 leds, for voice 1, 2, 3 are off. touching the keyboard changes the pitch slighly but then resumes the state before. I'm suspecting the latches: 74ls75
> > >>
> > >> QUESTION: how to test the key assigner cpu ? Is there a method simillar to the uC found on KLM 367 ?
> > >>
> > >> Thanks for support guys.
> > >>
> > >> Razvan
> > >>
> > >
> > >
> > >
> > >
> > > ------------------------------------
> > >
> > > Yahoo! Groups Links
> > >
> > >
> > >
> > >
> >
>

Hi,


Yes. Found the guidelines for calibrating them. The noise on output puzzles me. Sometimes appear / sometimes disappear for no apparent reason.

Arpegiator still dead.


I will continue the troubleshooting tommrow. Now I need a beer.


Thanks guys
Razvan



________________________________
From: tonezone020 <swamp.gigs@googlemail.com>
To: PolySix@yahoogroups.com
Sent: Wednesday, December 5, 2012 4:06 PM
Subject: [PolySix] Re: klm 367 board


 
Hi,

Guidelines for calibrating each voice are in the service manual...

T

--- In PolySix@yahoogroups.com, "arpm234" <arpm234@...> wrote:
>
> Hey Johannes,
>
> Thanks a lot for the ideas. I've tested this morning the RESET signal of the main cpu and whatever i did, there were constantly 4.6 v there so by following the schematics I noticed it linked to the comparator IC5, LM393 which was bad in a way that pin 7 (output) and pin 8 (vcc) were internally shorted.
>
> Replaced that and everything came to live. Including keyboard and tones.
>
> NOW, There are still things to figure out.
>
> 1. Arpeggiator not working.
> 2. There is a noise around 22khz at output, like a self resonant thing like an old tube while functioning or like a camera flash when charging. very annoying.
> 3. each and every voice may need calibrating as each one is different in volume, pitch or filter. are there any guidelines for this?
>
> thanks again.
>
> Razvan
>
> --- In PolySix@yahoogroups.com, Johannes Hausensteiner <johau@> wrote:
> >
> > Hi Razvan,
> >
> > I think there are two different problemes:
> > - KLM367 CPU not starting
> > - KLM366 Key Assigner behaving wierd
> >
> > First thing ist to make the KLM-367 CPU start reliable. Check the power
> > supply for correct voltages and perform the reset circuit adjustment
> > procedure given in the service manual.
> > The test pulse at TP4 *is* in 20msec intervals. The pulse itself is
> > very short.
> > Check the resonator frequency at IC22 (CPU) pin 3. It should be ca 6MHz.
> >
> > Second: The KLM-366 has a test mode as well. "It is started by jumpering
> > pins DB7 and P17 using a diode (cathode towards DB7) on the 8049
> > processor on the KLM-366 circuit board (this can be done on the
> > keyboard connector CN04). In this mode the CV DAC is set to generate
> > 0V, 2.5V, or 5V depending on the position of the OCTAVE switch (16'
> > results in 0V, etc.)".
> > You can check this voltage at KLM366/IC9/pin1.
> > Check the reset signal. KLM-366 is in reset when switching to Tape
> > Interface mode. Check the resonator frequency. It should be like on
> > KLM-367 6MHz at CPU pin 3.
> >
> > Do the buttons behave normally? (Porbably not...)
> > The BANK, MANUAL, and PROGRAM buttons operate on the KLM-367 Programmer
> > CPU, whereas the ARP, HOLD, UNISON, CHORD MEM, and POLY buttons operate
> > on the KLM-366 CPU.
> >
> > Good luck,
> >
> > Johannes
> >
> >
> >
> > On 2012-12-04 20:27, arpm234 wrote:
> > > nobody ?
> > >
> > > --- In PolySix@yahoogroups.com, "arpm234" <arpm234@> wrote:
> > >>
> > >> Hello,
> > >>
> > >> I've did some tests today and here;s what i found:
> > >>
> > >> TO CONFIRM: cpu seems to be working fine since i was able to see the clock on TP4 on osciloscope. Strege thing that somebody mentioned the gap should be 20 ms and i meassured 10ms. Is this ok ? Also the TP2 spot looks ok - The multiplexed signal from the pots it is there.
> > >>
> > >> PROBLEM: there cpu starts randomnly. A few power off - power on cycles are necesary to get the clock there. I this this is related of the bad 4 x 74ls75 found on the control panel board. Two of these latches seem to be dead.
> > >>
> > >> PROBLEM: Altoought there is sound presend, and lfo, cutoff, and all the other pots are working, the sound is non interupted, very loud and at a rather high pitch. voice 6, 5, 4 diode leds are light up, and the sound resemnbles like a few vco beeing active. the other 3 leds, for voice 1, 2, 3 are off. touching the keyboard changes the pitch slighly but then resumes the state before. I'm suspecting the latches: 74ls75
> > >>
> > >> QUESTION: how to test the key assigner cpu ? Is there a method simillar to the uC found on KLM 367 ?
> > >>
> > >> Thanks for support guys.
> > >>
> > >> Razvan
> > >>
> > >
> > >
> > >
> > >
> > > ------------------------------------
> > >
> > > Yahoo! Groups Links
> > >
> > >
> > >
> > >
> >
>




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

Hi,

1) Noise:
- Does the noise change after you play (a) key(s)?
- I have seen somewhere instructions for making an electric shield
between the KLM-368 and KLM-369 boards. Maybe this woiuld help.

2) Arpeggiator:
- How does it behave when you are saying "it is dead"?
- Does the ARP On/Off button LED work as expected?
- Does the LED flash according to the speed setting?
- The ARP trigger signal is routed through the rear panel "ARP Trig In"
jack. This is a "normalized" jack, maybe the contacts are dirty; or
one of the connections is bad on KLM-366, KLM-371.

Good luck!

Johannes

On 2012-12-05 15:33, Arp Duex wrote:
> Hi,
>
>
> Yes. Found the guidelines for calibrating them. The noise on output puzzles me. Sometimes appear / sometimes disappear for no apparent reason.
>
> Arpegiator still dead.
>
>
> I will continue the troubleshooting tommrow. Now I need a beer.
>
>
> Thanks guys
> Razvan
>
>
>
> ________________________________
> From: tonezone020 <swamp.gigs@googlemail.com>
> To: PolySix@yahoogroups.com
> Sent: Wednesday, December 5, 2012 4:06 PM
> Subject: [PolySix] Re: klm 367 board
>
>
>
> Hi,
>
> Guidelines for calibrating each voice are in the service manual...
>
> T
>
> --- In PolySix@yahoogroups.com, "arpm234" <arpm234@...> wrote:
>>
>> Hey Johannes,
>>
>> Thanks a lot for the ideas. I've tested this morning the RESET signal of the main cpu and whatever i did, there were constantly 4.6 v there so by following the schematics I noticed it linked to the comparator IC5, LM393 which was bad in a way that pin 7 (output) and pin 8 (vcc) were internally shorted.
>>
>> Replaced that and everything came to live. Including keyboard and tones.
>>
>> NOW, There are still things to figure out.
>>
>> 1. Arpeggiator not working.
>> 2. There is a noise around 22khz at output, like a self resonant thing like an old tube while functioning or like a camera flash when charging. very annoying.
>> 3. each and every voice may need calibrating as each one is different in volume, pitch or filter. are there any guidelines for this?
>>
>> thanks again.
>>
>> Razvan
>>
>> --- In PolySix@yahoogroups.com, Johannes Hausensteiner <johau@> wrote:
>>>
>>> Hi Razvan,
>>>
>>> I think there are two different problemes:
>>> - KLM367 CPU not starting
>>> - KLM366 Key Assigner behaving wierd
>>>
>>> First thing ist to make the KLM-367 CPU start reliable. Check the power
>>> supply for correct voltages and perform the reset circuit adjustment
>>> procedure given in the service manual.
>>> The test pulse at TP4 *is* in 20msec intervals. The pulse itself is
>>> very short.
>>> Check the resonator frequency at IC22 (CPU) pin 3. It should be ca 6MHz.
>>>
>>> Second: The KLM-366 has a test mode as well. "It is started by jumpering
>>> pins DB7 and P17 using a diode (cathode towards DB7) on the 8049
>>> processor on the KLM-366 circuit board (this can be done on the
>>> keyboard connector CN04). In this mode the CV DAC is set to generate
>>> 0V, 2.5V, or 5V depending on the position of the OCTAVE switch (16'
>>> results in 0V, etc.)".
>>> You can check this voltage at KLM366/IC9/pin1.
>>> Check the reset signal. KLM-366 is in reset when switching to Tape
>>> Interface mode. Check the resonator frequency. It should be like on
>>> KLM-367 6MHz at CPU pin 3.
>>>
>>> Do the buttons behave normally? (Porbably not...)
>>> The BANK, MANUAL, and PROGRAM buttons operate on the KLM-367 Programmer
>>> CPU, whereas the ARP, HOLD, UNISON, CHORD MEM, and POLY buttons operate
>>> on the KLM-366 CPU.
>>>
>>> Good luck,
>>>
>>> Johannes
>>>
>>>
>>>
>>> On 2012-12-04 20:27, arpm234 wrote:
>>>> nobody ?
>>>>
>>>> --- In PolySix@yahoogroups.com, "arpm234" <arpm234@> wrote:
>>>>>
>>>>> Hello,
>>>>>
>>>>> I've did some tests today and here;s what i found:
>>>>>
>>>>> TO CONFIRM: cpu seems to be working fine since i was able to see the clock on TP4 on osciloscope. Strege thing that somebody mentioned the gap should be 20 ms and i meassured 10ms. Is this ok ? Also the TP2 spot looks ok - The multiplexed signal from the pots it is there.
>>>>>
>>>>> PROBLEM: there cpu starts randomnly. A few power off - power on cycles are necesary to get the clock there. I this this is related of the bad 4 x 74ls75 found on the control panel board. Two of these latches seem to be dead.
>>>>>
>>>>> PROBLEM: Altoought there is sound presend, and lfo, cutoff, and all the other pots are working, the sound is non interupted, very loud and at a rather high pitch. voice 6, 5, 4 diode leds are light up, and the sound resemnbles like a few vco beeing active. the other 3 leds, for voice 1, 2, 3 are off. touching the keyboard changes the pitch slighly but then resumes the state before. I'm suspecting the latches: 74ls75
>>>>>
>>>>> QUESTION: how to test the key assigner cpu ? Is there a method simillar to the uC found on KLM 367 ?
>>>>>
>>>>> Thanks for support guys.
>>>>>
>>>>> Razvan
>>>>>
>>>>
>>>>
>>>>
>>>>
>>>> ------------------------------------
>>>>
>>>> Yahoo! Groups Links
>>>>
>>>>
>>>>
>>>>
>>>
>>
>
>
>
>
> [Non-text portions of this message have been removed]
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>
>

see comments.


________________________________
From: Johannes Hausensteiner <johau@gmx.net>
To: PolySix@yahoogroups.com
Sent: Wednesday, December 5, 2012 7:24 PM
Subject: Re: [PolySix] Re: klm 367 board


 
Hi,

1) Noise:
- Does the noise change after you play (a) key(s)?
- I have seen somewhere instructions for making an electric shield
between the KLM-368 and KLM-369 boards. Maybe this woiuld help.


//nope.. noise is there.. disapearing and reapearing in no regular
fashion. at least i could determine any pattern.

2) Arpeggiator:
- How does it behave when you are saying "it is dead"?
- Does the ARP On/Off button LED work as expected?
- Does the LED flash according to the speed setting?
- The ARP trigger signal is routed through the rear panel "ARP Trig In"
jack. This is a "normalized" jack, maybe the contacts are dirty; or
one of the connections is bad on KLM-366, KLM-371.


// led is flashing but when hittin the arp button it remains off. 
i'll check the jack.

Good luck!

Johannes

On 2012-12-05 15:33, Arp Duex wrote:
> Hi,
>
>
> Yes. Found the guidelines for calibrating them. The noise on output puzzles me. Sometimes appear / sometimes disappear for no apparent reason.
>
> Arpegiator still dead.
>
>
> I will continue the troubleshooting tommrow. Now I need a beer.
>
>
> Thanks guys
> Razvan
>
>
>
> ________________________________
> From: tonezone020 <swamp.gigs@googlemail.com>
> To: PolySix@yahoogroups.com
> Sent: Wednesday, December 5, 2012 4:06 PM
> Subject: [PolySix] Re: klm 367 board
>
>
>
> Hi,
>
> Guidelines for calibrating each voice are in the service manual...
>
> T
>
> --- In PolySix@yahoogroups.com, "arpm234" <arpm234@...> wrote:
>>
>> Hey Johannes,
>>
>> Thanks a lot for the ideas. I've tested this morning the RESET signal of the main cpu and whatever i did, there were constantly 4.6 v there so by following the schematics I noticed it linked to the comparator IC5, LM393 which was bad in a way that pin 7 (output) and pin 8 (vcc) were internally shorted.
>>
>> Replaced that and everything came to live. Including keyboard and tones.
>>
>> NOW, There are still things to figure out.
>>
>> 1. Arpeggiator not working.
>> 2. There is a noise around 22khz at output, like a self resonant thing like an old tube while functioning or like a camera flash when charging. very annoying.
>> 3. each and every voice may need calibrating as each one is different in volume, pitch or filter. are there any guidelines for this?
>>
>> thanks again.
>>
>> Razvan
>>
>> --- In PolySix@yahoogroups.com, Johannes Hausensteiner <johau@> wrote:
>>>
>>> Hi Razvan,
>>>
>>> I think there are two different problemes:
>>> - KLM367 CPU not starting
>>> - KLM366 Key Assigner behaving wierd
>>>
>>> First thing ist to make the KLM-367 CPU start reliable. Check the power
>>> supply for correct voltages and perform the reset circuit adjustment
>>> procedure given in the service manual.
>>> The test pulse at TP4 *is* in 20msec intervals. The pulse itself is
>>> very short.
>>> Check the resonator frequency at IC22 (CPU) pin 3. It should be ca 6MHz.
>>>
>>> Second: The KLM-366 has a test mode as well. "It is started by jumpering
>>> pins DB7 and P17 using a diode (cathode towards DB7) on the 8049
>>> processor on the KLM-366 circuit board (this can be done on the
>>> keyboard connector CN04). In this mode the CV DAC is set to generate
>>> 0V, 2.5V, or 5V depending on the position of the OCTAVE switch (16'
>>> results in 0V, etc.)".
>>> You can check this voltage at KLM366/IC9/pin1.
>>> Check the reset signal. KLM-366 is in reset when switching to Tape
>>> Interface mode. Check the resonator frequency. It should be like on
>>> KLM-367 6MHz at CPU pin 3.
>>>
>>> Do the buttons behave normally? (Porbably not...)
>>> The BANK, MANUAL, and PROGRAM buttons operate on the KLM-367 Programmer
>>> CPU, whereas the ARP, HOLD, UNISON, CHORD MEM, and POLY buttons operate
>>> on the KLM-366 CPU.
>>>
>>> Good luck,
>>>
>>> Johannes
>>>
>>>
>>>
>>> On 2012-12-04 20:27, arpm234 wrote:
>>>> nobody ?
>>>>
>>>> --- In PolySix@yahoogroups.com, "arpm234" <arpm234@> wrote:
>>>>>
>>>>> Hello,
>>>>>
>>>>> I've did some tests today and here;s what i found:
>>>>>
>>>>> TO CONFIRM: cpu seems to be working fine since i was able to see the clock on TP4 on osciloscope. Strege thing that somebody mentioned the gap should be 20 ms and i meassured 10ms. Is this ok ? Also the TP2 spot looks ok - The multiplexed signal from the pots it is there.
>>>>>
>>>>> PROBLEM: there cpu starts randomnly. A few power off - power on cycles are necesary to get the clock there. I this this is related of the bad 4 x 74ls75 found on the control panel board. Two of these latches seem to be dead.
>>>>>
>>>>> PROBLEM: Altoought there is sound presend, and lfo, cutoff, and all the other pots are working, the sound is non interupted, very loud and at a rather high pitch. voice 6, 5, 4 diode leds are light up, and the sound resemnbles like a few vco beeing active. the other 3 leds, for voice 1, 2, 3 are off. touching the keyboard changes the pitch slighly but then resumes the state before. I'm suspecting the latches: 74ls75
>>>>>
>>>>> QUESTION: how to test the key assigner cpu ? Is there a method simillar to the uC found on KLM 367 ?
>>>>>
>>>>> Thanks for support guys.
>>>>>
>>>>> Razvan
>>>>>
>>>>
>>>>
>>>>
>>>>
>>>> ------------------------------------
>>>>
>>>> Yahoo! Groups Links
>>>>
>>>>
>>>>
>>>>
>>>
>>
>
>
>
>
> [Non-text portions of this message have been removed]
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>
>



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

Hi,

I am afraid I cannot help you with the noise remotely. The Polysix is
quite noisy. Most of it comes from the BBD circuits of the KLM-368
board. You might take the signal directly from CN14 of KLM-366. This
is the pure synthesizer signal, before going through the KLM-368
effects board.

ARP:
It might be that ARP On/Off button does not work. You could try with
the lid open to make a temporary short across the button contacts
with a pair of pliers or a wire. These buttons wear out.

Good luck!

Johannes

On 2012-12-05 18:57, Arp Duex wrote:
> see comments.
>
>
> ________________________________
> From: Johannes Hausensteiner <johau@gmx.net>
> To: PolySix@yahoogroups.com
> Sent: Wednesday, December 5, 2012 7:24 PM
> Subject: Re: [PolySix] Re: klm 367 board
>
>
>
> Hi,
>
> 1) Noise:
> - Does the noise change after you play (a) key(s)?
> - I have seen somewhere instructions for making an electric shield
> between the KLM-368 and KLM-369 boards. Maybe this woiuld help.
>
>
> //nope.. noise is there.. disapearing and reapearing in no regular
> fashion. at least i could determine any pattern.
>
> 2) Arpeggiator:
> - How does it behave when you are saying "it is dead"?
> - Does the ARP On/Off button LED work as expected?
> - Does the LED flash according to the speed setting?
> - The ARP trigger signal is routed through the rear panel "ARP Trig In"
> jack. This is a "normalized" jack, maybe the contacts are dirty; or
> one of the connections is bad on KLM-366, KLM-371.
>
>
> // led is flashing but when hittin the arp button it remains off.
> i'll check the jack.
>
> Good luck!
>
> Johannes
>
> On 2012-12-05 15:33, Arp Duex wrote:
>> Hi,
>>
>>
>> Yes. Found the guidelines for calibrating them. The noise on output puzzles me. Sometimes appear / sometimes disappear for no apparent reason.
>>
>> Arpegiator still dead.
>>
>>
>> I will continue the troubleshooting tommrow. Now I need a beer.
>>
>>
>> Thanks guys
>> Razvan
>>
>>
>>
>> ________________________________
>> From: tonezone020 <swamp.gigs@googlemail.com>
>> To: PolySix@yahoogroups.com
>> Sent: Wednesday, December 5, 2012 4:06 PM
>> Subject: [PolySix] Re: klm 367 board
>>
>>
>>
>> Hi,
>>
>> Guidelines for calibrating each voice are in the service manual...
>>
>> T
>>
>> --- In PolySix@yahoogroups.com, "arpm234" <arpm234@...> wrote:
>>>
>>> Hey Johannes,
>>>
>>> Thanks a lot for the ideas. I've tested this morning the RESET signal of the main cpu and whatever i did, there were constantly 4.6 v there so by following the schematics I noticed it linked to the comparator IC5, LM393 which was bad in a way that pin 7 (output) and pin 8 (vcc) were internally shorted.
>>>
>>> Replaced that and everything came to live. Including keyboard and tones.
>>>
>>> NOW, There are still things to figure out.
>>>
>>> 1. Arpeggiator not working.
>>> 2. There is a noise around 22khz at output, like a self resonant thing like an old tube while functioning or like a camera flash when charging. very annoying.
>>> 3. each and every voice may need calibrating as each one is different in volume, pitch or filter. are there any guidelines for this?
>>>
>>> thanks again.
>>>
>>> Razvan
>>>
>>> --- In PolySix@yahoogroups.com, Johannes Hausensteiner <johau@> wrote:
>>>>
>>>> Hi Razvan,
>>>>
>>>> I think there are two different problemes:
>>>> - KLM367 CPU not starting
>>>> - KLM366 Key Assigner behaving wierd
>>>>
>>>> First thing ist to make the KLM-367 CPU start reliable. Check the power
>>>> supply for correct voltages and perform the reset circuit adjustment
>>>> procedure given in the service manual.
>>>> The test pulse at TP4 *is* in 20msec intervals. The pulse itself is
>>>> very short.
>>>> Check the resonator frequency at IC22 (CPU) pin 3. It should be ca 6MHz.
>>>>
>>>> Second: The KLM-366 has a test mode as well. "It is started by jumpering
>>>> pins DB7 and P17 using a diode (cathode towards DB7) on the 8049
>>>> processor on the KLM-366 circuit board (this can be done on the
>>>> keyboard connector CN04). In this mode the CV DAC is set to generate
>>>> 0V, 2.5V, or 5V depending on the position of the OCTAVE switch (16'
>>>> results in 0V, etc.)".
>>>> You can check this voltage at KLM366/IC9/pin1.
>>>> Check the reset signal. KLM-366 is in reset when switching to Tape
>>>> Interface mode. Check the resonator frequency. It should be like on
>>>> KLM-367 6MHz at CPU pin 3.
>>>>
>>>> Do the buttons behave normally? (Porbably not...)
>>>> The BANK, MANUAL, and PROGRAM buttons operate on the KLM-367 Programmer
>>>> CPU, whereas the ARP, HOLD, UNISON, CHORD MEM, and POLY buttons operate
>>>> on the KLM-366 CPU.
>>>>
>>>> Good luck,
>>>>
>>>> Johannes
>>>>
>>>>
>>>>
>>>> On 2012-12-04 20:27, arpm234 wrote:
>>>>> nobody ?
>>>>>
>>>>> --- In PolySix@yahoogroups.com, "arpm234" <arpm234@> wrote:
>>>>>>
>>>>>> Hello,
>>>>>>
>>>>>> I've did some tests today and here;s what i found:
>>>>>>
>>>>>> TO CONFIRM: cpu seems to be working fine since i was able to see the clock on TP4 on osciloscope. Strege thing that somebody mentioned the gap should be 20 ms and i meassured 10ms. Is this ok ? Also the TP2 spot looks ok - The multiplexed signal from the pots it is there.
>>>>>>
>>>>>> PROBLEM: there cpu starts randomnly. A few power off - power on cycles are necesary to get the clock there. I this this is related of the bad 4 x 74ls75 found on the control panel board. Two of these latches seem to be dead.
>>>>>>
>>>>>> PROBLEM: Altoought there is sound presend, and lfo, cutoff, and all the other pots are working, the sound is non interupted, very loud and at a rather high pitch. voice 6, 5, 4 diode leds are light up, and the sound resemnbles like a few vco beeing active. the other 3 leds, for voice 1, 2, 3 are off. touching the keyboard changes the pitch slighly but then resumes the state before. I'm suspecting the latches: 74ls75
>>>>>>
>>>>>> QUESTION: how to test the key assigner cpu ? Is there a method simillar to the uC found on KLM 367 ?
>>>>>>
>>>>>> Thanks for support guys.
>>>>>>
>>>>>> Razvan
>>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> ------------------------------------
>>>>>
>>>>> Yahoo! Groups Links
>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>>
>>
>>
>>
>>
>> [Non-text portions of this message have been removed]
>>
>>
>>
>> ------------------------------------
>>
>> Yahoo! Groups Links
>>
>>
>>
>>
>
>
>
> [Non-text portions of this message have been removed]
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>
>

johannes, check mail ..;)

--- In PolySix@yahoogroups.com, "arpm234" <arpm234@...> wrote:
>
> Hello guys,
>
> I've bought a polysix in quite a good shape but electronically non functional, so i started to troubleshoot.
>
> At first power, there are 3 voices comming up, sometimes one, at each start and they seem to have the same pitch. Modulation and Bend works. Tune knob works. Except these, the bank lights come up heratically.
>
> Adjusted the power supply to be +15, - 15, +5 on the spot.
>
> I noticed 2 of the 4 latches chip 74ls75 on the panel board were marked by somebody with an X so I figured these need changing.
>
> Keyboard seems to affect the pitch slighly when pressing more than 3, 4 keys.
>
> Arpegiator led is flashing and rate is adjustable.
>
> My guess is the KLM 367 is causing the problems, so i verified the traces around IC 31 and resolder them back in place.
>
> Now, I have no idea how to check wheter the CPU, RAM, DAC or LM13600 are working fine, but I probed the CPU using an Oscilloscope and the clock was there at 6mhz, and on some other pin there seem to be data flowing.
>
> Somebody with more experience to privide guidance ?
>

johannes, check mail..;)

--- In PolySix@yahoogroups.com, Johannes Hausensteiner <johau@...> wrote:
>
> Hi,
>
> I am afraid I cannot help you with the noise remotely. The Polysix is
> quite noisy. Most of it comes from the BBD circuits of the KLM-368
> board. You might take the signal directly from CN14 of KLM-366. This
> is the pure synthesizer signal, before going through the KLM-368
> effects board.
>
> ARP:
> It might be that ARP On/Off button does not work. You could try with
> the lid open to make a temporary short across the button contacts
> with a pair of pliers or a wire. These buttons wear out.
>
> Good luck!
>
> Johannes
>
>
> On 2012-12-05 18:57, Arp Duex wrote:
> > see comments.
> >
> >
> > ________________________________
> > From: Johannes Hausensteiner <johau@...>
> > To: PolySix@yahoogroups.com
> > Sent: Wednesday, December 5, 2012 7:24 PM
> > Subject: Re: [PolySix] Re: klm 367 board
> >
> >
> >
> > Hi,
> >
> > 1) Noise:
> > - Does the noise change after you play (a) key(s)?
> > - I have seen somewhere instructions for making an electric shield
> > between the KLM-368 and KLM-369 boards. Maybe this woiuld help.
> >
> >
> > //nope.. noise is there.. disapearing and reapearing in no regular
> > fashion. at least i could determine any pattern.
> >
> > 2) Arpeggiator:
> > - How does it behave when you are saying "it is dead"?
> > - Does the ARP On/Off button LED work as expected?
> > - Does the LED flash according to the speed setting?
> > - The ARP trigger signal is routed through the rear panel "ARP Trig In"
> > jack. This is a "normalized" jack, maybe the contacts are dirty; or
> > one of the connections is bad on KLM-366, KLM-371.
> >
> >
> > // led is flashing but when hittin the arp button it remains off.
> > i'll check the jack.
> >
> > Good luck!
> >
> > Johannes
> >
> > On 2012-12-05 15:33, Arp Duex wrote:
> >> Hi,
> >>
> >>
> >> Yes. Found the guidelines for calibrating them. The noise on output puzzles me. Sometimes appear / sometimes disappear for no apparent reason.
> >>
> >> Arpegiator still dead.
> >>
> >>
> >> I will continue the troubleshooting tommrow. Now I need a beer.
> >>
> >>
> >> Thanks guys
> >> Razvan
> >>
> >>
> >>
> >> ________________________________
> >> From: tonezone020 <swamp.gigs@...>
> >> To: PolySix@yahoogroups.com
> >> Sent: Wednesday, December 5, 2012 4:06 PM
> >> Subject: [PolySix] Re: klm 367 board
> >>
> >>
> >>
> >> Hi,
> >>
> >> Guidelines for calibrating each voice are in the service manual...
> >>
> >> T
> >>
> >> --- In PolySix@yahoogroups.com, "arpm234" <arpm234@> wrote:
> >>>
> >>> Hey Johannes,
> >>>
> >>> Thanks a lot for the ideas. I've tested this morning the RESET signal of the main cpu and whatever i did, there were constantly 4.6 v there so by following the schematics I noticed it linked to the comparator IC5, LM393 which was bad in a way that pin 7 (output) and pin 8 (vcc) were internally shorted.
> >>>
> >>> Replaced that and everything came to live. Including keyboard and tones.
> >>>
> >>> NOW, There are still things to figure out.
> >>>
> >>> 1. Arpeggiator not working.
> >>> 2. There is a noise around 22khz at output, like a self resonant thing like an old tube while functioning or like a camera flash when charging. very annoying.
> >>> 3. each and every voice may need calibrating as each one is different in volume, pitch or filter. are there any guidelines for this?
> >>>
> >>> thanks again.
> >>>
> >>> Razvan
> >>>
> >>> --- In PolySix@yahoogroups.com, Johannes Hausensteiner <johau@> wrote:
> >>>>
> >>>> Hi Razvan,
> >>>>
> >>>> I think there are two different problemes:
> >>>> - KLM367 CPU not starting
> >>>> - KLM366 Key Assigner behaving wierd
> >>>>
> >>>> First thing ist to make the KLM-367 CPU start reliable. Check the power
> >>>> supply for correct voltages and perform the reset circuit adjustment
> >>>> procedure given in the service manual.
> >>>> The test pulse at TP4 *is* in 20msec intervals. The pulse itself is
> >>>> very short.
> >>>> Check the resonator frequency at IC22 (CPU) pin 3. It should be ca 6MHz.
> >>>>
> >>>> Second: The KLM-366 has a test mode as well. "It is started by jumpering
> >>>> pins DB7 and P17 using a diode (cathode towards DB7) on the 8049
> >>>> processor on the KLM-366 circuit board (this can be done on the
> >>>> keyboard connector CN04). In this mode the CV DAC is set to generate
> >>>> 0V, 2.5V, or 5V depending on the position of the OCTAVE switch (16'
> >>>> results in 0V, etc.)".
> >>>> You can check this voltage at KLM366/IC9/pin1.
> >>>> Check the reset signal. KLM-366 is in reset when switching to Tape
> >>>> Interface mode. Check the resonator frequency. It should be like on
> >>>> KLM-367 6MHz at CPU pin 3.
> >>>>
> >>>> Do the buttons behave normally? (Porbably not...)
> >>>> The BANK, MANUAL, and PROGRAM buttons operate on the KLM-367 Programmer
> >>>> CPU, whereas the ARP, HOLD, UNISON, CHORD MEM, and POLY buttons operate
> >>>> on the KLM-366 CPU.
> >>>>
> >>>> Good luck,
> >>>>
> >>>> Johannes
> >>>>
> >>>>
> >>>>
> >>>> On 2012-12-04 20:27, arpm234 wrote:
> >>>>> nobody ?
> >>>>>
> >>>>> --- In PolySix@yahoogroups.com, "arpm234" <arpm234@> wrote:
> >>>>>>
> >>>>>> Hello,
> >>>>>>
> >>>>>> I've did some tests today and here;s what i found:
> >>>>>>
> >>>>>> TO CONFIRM: cpu seems to be working fine since i was able to see the clock on TP4 on osciloscope. Strege thing that somebody mentioned the gap should be 20 ms and i meassured 10ms. Is this ok ? Also the TP2 spot looks ok - The multiplexed signal from the pots it is there.
> >>>>>>
> >>>>>> PROBLEM: there cpu starts randomnly. A few power off - power on cycles are necesary to get the clock there. I this this is related of the bad 4 x 74ls75 found on the control panel board. Two of these latches seem to be dead.
> >>>>>>
> >>>>>> PROBLEM: Altoought there is sound presend, and lfo, cutoff, and all the other pots are working, the sound is non interupted, very loud and at a rather high pitch. voice 6, 5, 4 diode leds are light up, and the sound resemnbles like a few vco beeing active. the other 3 leds, for voice 1, 2, 3 are off. touching the keyboard changes the pitch slighly but then resumes the state before. I'm suspecting the latches: 74ls75
> >>>>>>
> >>>>>> QUESTION: how to test the key assigner cpu ? Is there a method simillar to the uC found on KLM 367 ?
> >>>>>>
> >>>>>> Thanks for support guys.
> >>>>>>
> >>>>>> Razvan
> >>>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>> ------------------------------------
> >>>>>
> >>>>> Yahoo! Groups Links
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>
> >>>
> >>
> >>
> >>
> >>
> >> [Non-text portions of this message have been removed]
> >>
> >>
> >>
> >> ------------------------------------
> >>
> >> Yahoo! Groups Links
> >>
> >>
> >>
> >>
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
> >
> >
> > ------------------------------------
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
>

I have been doing some experiments with the noises in the Polysix. I have managed to reduce the noise in my Kiwisix development P6 to almost zero by adding four grounding wires. Details can be found in the latest user manual v1.23 in the install section which can be downloaded from the kiwitechnics web site.

MH

--- In PolySix@yahoogroups.com, Johannes Hausensteiner wrote:
>
> Hi,
>
> I am afraid I cannot help you with the noise remotely. The Polysix is
> quite noisy. Most of it comes from the BBD circuits of the KLM-368
> board. You might take the signal directly from CN14 of KLM-366. This
> is the pure synthesizer signal, before going through the KLM-368
> effects board.
>
> ARP:
> It might be that ARP On/Off button does not work. You could try with
> the lid open to make a temporary short across the button contacts
> with a pair of pliers or a wire. These buttons wear out.
>
> Good luck!
>
> Johannes
>
>
> On 2012-12-05 18:57, Arp Duex wrote:
> > see comments.
> >
> >
> > ________________________________
> > From: Johannes Hausensteiner
> > To: PolySix@yahoogroups.com
> > Sent: Wednesday, December 5, 2012 7:24 PM
> > Subject: Re: [PolySix] Re: klm 367 board
> >
> >
> >
> > Hi,
> >
> > 1) Noise:
> > - Does the noise change after you play (a) key(s)?
> > - I have seen somewhere instructions for making an electric shield
> > between the KLM-368 and KLM-369 boards. Maybe this woiuld help.
> >
> >
> > //nope.. noise is there.. disapearing and reapearing in no regular
> > fashion. at least i could determine any pattern.
> >
> > 2) Arpeggiator:
> > - How does it behave when you are saying "it is dead"?
> > - Does the ARP On/Off button LED work as expected?
> > - Does the LED flash according to the speed setting?
> > - The ARP trigger signal is routed through the rear panel "ARP Trig In"
> > jack. This is a "normalized" jack, maybe the contacts are dirty; or
> > one of the connections is bad on KLM-366, KLM-371.
> >
> >
> > // led is flashing but when hittin the arp button it remains off.
> > i'll check the jack.
> >
> > Good luck!
> >
> > Johannes
> >
> > On 2012-12-05 15:33, Arp Duex wrote:
> >> Hi,
> >>
> >>
> >> Yes. Found the guidelines for calibrating them. The noise on output puzzles me. Sometimes appear / sometimes disappear for no apparent reason.
> >>
> >> Arpegiator still dead.
> >>
> >>
> >> I will continue the troubleshooting tommrow. Now I need a beer.
> >>
> >>
> >> Thanks guys
> >> Razvan
> >>
> >>
> >>
> >> ________________________________
> >> From: tonezone020
> >> To: PolySix@yahoogroups.com
> >> Sent: Wednesday, December 5, 2012 4:06 PM
> >> Subject: [PolySix] Re: klm 367 board
> >>
> >>
> >>
> >> Hi,
> >>
> >> Guidelines for calibrating each voice are in the service manual...
> >>
> >> T
> >>
> >> --- In PolySix@yahoogroups.com, "arpm234" wrote:
> >>>
> >>> Hey Johannes,
> >>>
> >>> Thanks a lot for the ideas. I've tested this morning the RESET signal of the main cpu and whatever i did, there were constantly 4.6 v there so by following the schematics I noticed it linked to the comparator IC5, LM393 which was bad in a way that pin 7 (output) and pin 8 (vcc) were internally shorted.
> >>>
> >>> Replaced that and everything came to live. Including keyboard and tones.
> >>>
> >>> NOW, There are still things to figure out.
> >>>
> >>> 1. Arpeggiator not working.
> >>> 2. There is a noise around 22khz at output, like a self resonant thing like an old tube while functioning or like a camera flash when charging. very annoying.
> >>> 3. each and every voice may need calibrating as each one is different in volume, pitch or filter. are there any guidelines for this?
> >>>
> >>> thanks again.
> >>>
> >>> Razvan
> >>>
> >>> --- In PolySix@yahoogroups.com, Johannes Hausensteiner wrote:
> >>>>
> >>>> Hi Razvan,
> >>>>
> >>>> I think there are two different problemes:
> >>>> - KLM367 CPU not starting
> >>>> - KLM366 Key Assigner behaving wierd
> >>>>
> >>>> First thing ist to make the KLM-367 CPU start reliable. Check the power
> >>>> supply for correct voltages and perform the reset circuit adjustment
> >>>> procedure given in the service manual.
> >>>> The test pulse at TP4 *is* in 20msec intervals. The pulse itself is
> >>>> very short.
> >>>> Check the resonator frequency at IC22 (CPU) pin 3. It should be ca 6MHz.
> >>>>
> >>>> Second: The KLM-366 has a test mode as well. "It is started by jumpering
> >>>> pins DB7 and P17 using a diode (cathode towards DB7) on the 8049
> >>>> processor on the KLM-366 circuit board (this can be done on the
> >>>> keyboard connector CN04). In this mode the CV DAC is set to generate
> >>>> 0V, 2.5V, or 5V depending on the position of the OCTAVE switch (16'
> >>>> results in 0V, etc.)".
> >>>> You can check this voltage at KLM366/IC9/pin1.
> >>>> Check the reset signal. KLM-366 is in reset when switching to Tape
> >>>> Interface mode. Check the resonator frequency. It should be like on
> >>>> KLM-367 6MHz at CPU pin 3.
> >>>>
> >>>> Do the buttons behave normally? (Porbably not...)
> >>>> The BANK, MANUAL, and PROGRAM buttons operate on the KLM-367 Programmer
> >>>> CPU, whereas the ARP, HOLD, UNISON, CHORD MEM, and POLY buttons operate
> >>>> on the KLM-366 CPU.
> >>>>
> >>>> Good luck,
> >>>>
> >>>> Johannes
> >>>>
> >>>>
> >>>>
> >>>> On 2012-12-04 20:27, arpm234 wrote:
> >>>>> nobody ?
> >>>>>
> >>>>> --- In PolySix@yahoogroups.com, "arpm234" wrote:
> >>>>>>
> >>>>>> Hello,
> >>>>>>
> >>>>>> I've did some tests today and here;s what i found:
> >>>>>>
> >>>>>> TO CONFIRM: cpu seems to be working fine since i was able to see the clock on TP4 on osciloscope. Strege thing that somebody mentioned the gap should be 20 ms and i meassured 10ms. Is this ok ? Also the TP2 spot looks ok - The multiplexed signal from the pots it is there.
> >>>>>>
> >>>>>> PROBLEM: there cpu starts randomnly. A few power off - power on cycles are necesary to get the clock there. I this this is related of the bad 4 x 74ls75 found on the control panel board. Two of these latches seem to be dead.
> >>>>>>
> >>>>>> PROBLEM: Altoought there is sound presend, and lfo, cutoff, and all the other pots are working, the sound is non interupted, very loud and at a rather high pitch. voice 6, 5, 4 diode leds are light up, and the sound resemnbles like a few vco beeing active. the other 3 leds, for voice 1, 2, 3 are off. touching the keyboard changes the pitch slighly but then resumes the state before. I'm suspecting the latches: 74ls75
> >>>>>>
> >>>>>> QUESTION: how to test the key assigner cpu ? Is there a method simillar to the uC found on KLM 367 ?
> >>>>>>
> >>>>>> Thanks for support guys.
> >>>>>>
> >>>>>> Razvan
> >>>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>> ------------------------------------
> >>>>>
> >>>>> Yahoo! Groups Links
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>
> >>>
> >>
> >>
> >>
> >>
> >> [Non-text portions of this message have been removed]
> >>
> >>
> >>
> >> ------------------------------------
> >>
> >> Yahoo! Groups Links
> >>
> >>
> >>
> >>
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
> >
> >
> > ------------------------------------
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
>