I wanted to update the CS-80 problem saga:
After carefully checking hundreds of connections, I took the TRIG1 board out of the rack.
There are some repair signs made by the previous owners: some of the ICs are socketed (mono in line), some soldering ponts were faulty.
Now the sustain problem has been solved, the only fault remaining is the M21 voice that keeps on not working only in the first 11 panel buttons on CH II, while Memory 2 /4 / Panel work fine on all of the 8 voices.
My question: could this problem be related to the same TRIG 1 (or other) board(s)?
David now I bless you for the precious service manual that I bought some years ago from you!!!
Fernando
Il giorno 14/feb/2011, alle ore 02.19, KSR ha scritto:
> Check all the wires on R52
>
> -----Original Message-----
> From: Fernando Zarone
> Sent: Sunday, February 13, 2011 2:26 PM
> To: yamahacs80@yahoogroups.com
> Subject: [yamahacs80] UPDATE!!! CS80 voice problem
>
> Now the situation is worse (did I make a mistake or didn't I noticed it
> before?):
>
> All of the last 5 presets of CH II : harpsichord 2, 0rgan 2 up to funky 4
> have a Looooooong sustain, I guess the maximum amount. memory 2 and 4 and
> panel work.
>
> Inizio messaggio inoltrato:
>
> > Da: Fernando Zarone <fernandozarone@...>
> > Data: 13 febbraio 2011 12.58.44 GMT+01.00
> > A: yamahacs80@yahoogroups.com
> > Oggetto: Re: [yamahacs80] CS80 voice problem
> >
> > I am getting crazy.
> > Summary:
> > Voice n.1 (board 21) has a problem. This should be not in the board
> > itself, because it doesn't play ONLY when one of the CHII PRESETS (from
> > Strings to Funky) are selected! When in MEMORY or PANEL it works. So, the
> > problem should be somewhere interrupting the flow to M21 but from a common
> > origin, common to all of the presets...
> >
> > Any further idea?
> >
> >
> >
> >
> > Il giorno 12/feb/2011, alle ore 22.05, David Rogoff ha scritto:
> >
> >> > Fernando Zarone <mailto:fernandozarone@...>
> >> > February 12, 2011 11:22 AM
> >> >
> >> >
> >> > Hello all.
> >> > After switching the machine on, here is the problem:
> >> > MIX I : everything works fine. I move the "channel" selector down to
> >> > Mix II
> >> > MIX II: panel and memory do work as well. Only the Preset buttons show
> >> > the following fault:
> >> > when I play the first note it does not work (sometimes it seems to
> >> > fire a note, but at a very low level... ), the following 6 in a row do
> >> > work. then the following does not work, and so on. 1 yes 6 no.
> >> > Moreover, when I keep the first (faulty) key down, and play another
> >> > key in a repeated sequential way, all of the notes are normally heard.
> >> > I tried to move and check the boards' cables, no clue. The fact that
> >> > all of the voices work when panel or memory 2-4 are switched on means
> >> > that the voice board of the first note (21)
> >> > is not faulty. Do I have to check at T54 or BA?
> >>
> >> Hi Fernando.
> >>
> >> It certainly seems like a problem with the first voice card for channel
> >> II (M21). It's weird that it's OK from panel and not presets. Here's a
> >> couple of ideas to narrow it down:
> >> On the panel, turn off VCF level and put Sine level at maximum. Verify
> >> all voices work ok.
> >> Now turn down Sine and turn up VCF. Turn on pulse wave but turn off
> >> sawtooth. Verify all voices.
> >> Finally, turn off pulse and turn on sawtooth and repeat.
> >> Let us know if that shows anything interesting.
> >>
> >> David
> >>
> >> [Non-text portions of this message have been removed]
> >>
> >>
> >>
> >
>
> [Non-text portions of this message have been removed]
>
> ------------------------------------
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