Yamaha CS80

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.
> 
Not only are all of the voices in the "panel" position working, but also in both the "memory 2 and 4" positions! Just in the fixed PRESET ones  MIX II...  
I have tested the way you indicated to me: all of the voices work, in PANEL position, both only sine (no VCF) and pulse and sawtooth. 
I have also checked the wire connections between BA and T54 , and between T54 and M21. All are ok. 
Mistery. 




Fernando



> 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
> 
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> 
> 



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