Glad to hear you found the cause for the problem !
Actually have a much similiar problem on my Kawai SX-210 (great
synth BTW),
One of the 8 notes it can play (oscillator) will always sound duller
than the other 7. Actually, it is like the EG (the filter's ADSR)
won't effect on it. When you play some chord that contains the
problemtic note, the whole sound will sound scattered (ta ta ta ta ta)
and as you tweak some parameters on the EG (ADSR) it will sound
faster or slower (the "tatatatata" sound).
I was mainly focued on the computer board as the problems started
when the battary (placed on that board) has leaked all over, so I
had to reaplce some parts and rewire many traces,
But now it looks like the problem should lay on the 2nd oscillator
(that's the one that sounds different). Is that right ?
I noticed the audio circuit uses the same SSM2044 chips (for
filters?) but no 2056 chips. Instead there are a few CD4066BE chips
for every oscillator. Is that the EG chip ?
I saw that the Moog Taurus uses the same CD4066BE chip on the
Filter/VCA/Envelope circuit... like on the following link -
http://home.debitel.net/user/jhaible/jh_minotaurus_1.pdfThanks everyone for any advice !
--- In PolySix@yahoogroups.com, "dotwav" <rob19@e...> wrote:
> Hi Roman, this was great, many thanks.
> I have found that the sixth voice had a faulty SSM2056 (EG) chip.
> When I moved just the 2056 to another voice, the fauly note
appeared
> on the new voice, when I moved just the 2044, the faulty voice was
> still no.6 (it hadnt been moved at this point and 2056 was still in
> voice 6)
> There appears to be a number of adjustable pots (I think thats what
> they are, and I'm assuming it's one of these that you adjust for
> tuning, however, a little unsure as to what you mean by "adjust the
> voice to tuning procedure" as I don't know what the correct
> procedure is, so I think I'll just change the chip and hopefully
> that will solve my problem.
>
> Thanks again for the help... Rob
>
>
>
> --- In PolySix@yahoogroups.com, Sowa Roman <roman.sowa@u...> wrote:
> Hi,
> looks to me like you have problem with one voice.
> It requires trimming, and if it doesn't help, the chips in that
> voice may be faulty.
> I suggest the following:
> 1. find the faulty voice - there's a LED in each voice, so you know
> for sure which of the 6 are faulty when you play it.
> 2. adjust the voice according to tuning procedure
> 3. if it doesn't help, replace filter chip (SSM2044) and envelope
> generator (SSM2056?) with chips from any other voice. If the
problem
> occurs with that other voice now, you know you have faulty chips.
> 4. check also connections between voice and CPU board. Best is to
> disconnect and reconnect them several times.
> 5. if that sounds too techy for you, give the P6 to someone who
can
> fix it.
> Roman