Yamaha CS80

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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