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Thread
2002-02-14 by Fin
Hi all. I have one faulty voice card in a CS-60. The sawtooth waveform is not present at the output, the pulse wave is. I know that the Yamaha chip producing both the waveforms is fine. Does anybody have a scan for the schematics of the CS-60 voice cards? Regards, Fin
2002-02-19 by christopher_s_rider
Hm, never knew this group existed til now. In any case: The CS-50/60/80 'M' (master) voice boards are nearly identical among the 3 instruments. If you look at: http://www.cs80.com/docs/schem/cs80_circ5.jpg You can see the two FET switches that gate the saw and pulse waveforms to the filters. My bet is the saw switch-FET died, or its control transistor died. Crow http://www.cs80.com/ /**/ --- In vintagesynthrepair@y..., "Fin" <fin@w...> wrote:
> I have one faulty voice card in a CS-60. > The sawtooth waveform is not present at the output, the pulse wave >is. I know that the Yamaha chip producing both the waveforms is fine. > > Does anybody have a scan for the schematics of the CS-60 voice >cards?
2002-02-19 by Fin
Brilliant. Thanks, I'll test those asap. Great group. Fin ----- Original Message -----
From: christopher_s_rider <oldcrow@...> To: <vintagesynthrepair@yahoogroups.com> Sent: Tuesday, February 19, 2002 8:32 PM Subject: [vintagesynthrepair] Re: Yamaha CS-60 voice board, > Hm, never knew this group existed til now. In any case: > > The CS-50/60/80 'M' (master) voice boards are nearly identical > among the 3 instruments. If you look at: > > http://www.cs80.com/docs/schem/cs80_circ5.jpg > > You can see the two FET switches that gate the saw and pulse > waveforms to the filters. My bet is the saw switch-FET died, or its > control transistor died. > > Crow > http://www.cs80.com/ > /**/ > > --- In vintagesynthrepair@y..., "Fin" <fin@w...> wrote: > > > I have one faulty voice card in a CS-60. > > The sawtooth waveform is not present at the output, the pulse wave > >is. I know that the Yamaha chip producing both the waveforms is fine. > > > > Does anybody have a scan for the schematics of the CS-60 voice > >cards? > > > > Yahoo! Groups Sponsor > ADVERTISEMENT > > > > > To unsubscribe from this group, send an email to: > vintagesynthrepair-unsubscribe@egroups.com > > > > Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. > >