Yamaha CS80

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

--- 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

Hey David.

I think we've been through the 'touching the cards' thing...

Look at Scott's (Old Crow's) site www.cs80.com for info on this.

You don't want to blow those static sensitive chips...! I think
Yamaha recommended the procudure in error.

Cheers.
TOM

--- In yamahacs80@yahoogroups.com, "David Rogoff" <david@t...> wrote:

> 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