Yamaha CS80

--- In yamahacs80@yahoogroups.com, "g4dfv2004" <duncan.walters@n...> 
wrote:
> Has anyone any experience of the CS60?
> I have one for restore/repair.
> Basically, everthing sounds garbled,
> and on depressing just a single key repeatedly gives 
> a different sound each time it's pressed.
> I have cleaned all key contacts, all front panel
> slider control tracks and the preset
> pots on the numerous circuit boards.
> (Needless to say I have set them back to original
> settings!)
> Any assistance would be greatly appreciated.
> Anyone got any driving instructions,circuit diagrams and/or 
> technical info for this beast? 
> Willing to pay any costs involved.
> Please reply soon.
> 
> Duncan


Duncan,

most of the circuits in the CS60 are the same as in the CS80 (voice/M 
cards, keyboard scanner).  There are links from the Links page to 
some of the circuit diagrams.  Most of these should apply.  Crow's 
CS80 tuning adjustments (www.cs80.com) should probably work for the 
CS60.  Any differences anyone knows of?

What do you mean
> and on depressing just a single key repeatedly gives 
> a different sound each time it's pressed

Different pitch? volume? brightness?  When you repeatedly hit a hit, 
it rotates through the 8 voice cards (actually, it's a little 
trickier than that).  The easiest way to figure out which card is 
which is to pop the lid up.  You'll see the 8 identical voice cards 
in the rack (good pic of CS60 here: 
www.nougat.org/~cchen/pictures/2002/07-07-Yamaha-CS-80/trythis.jpg). 
If you cleaned all the little trim-pots on the voice cards, you've 
certainly thrown the tuning to hell.

Hold down a note and then touch each of the circuit cards.  When you 
touch the card that's sounding, you should hear a little modulation 
of the sound.  I don't remember where the best place to touch the 
card is (it's been a few years).  Anyone else?

 David