The Kawai & Teisco Analog Synths Group

It might be that as long as you don't change keys the assigner doen't 
change the assignment... you'll have to check with an audio probe 
which is the actual osc. playing. If they all play then the problem 
doesn't lay in the voice board probably.

Touch the ICs, is any of them way too hot ?
I had a similar problem on my Roland MKS-70 (voices sounded 
different, kind of "corrupt" as if they didn't get the correct data 
setting). The main CPU on the voice board was defected.

Are all main voltages correct ?



--- In kawai_sx210@yahoogroups.com, "Mark Daborn" <darkest.yugo@n...> 
wrote:
> Hi again!
> 
> Since my friend and i had a poke around, the behaviour  is slightly 
more predictable.
> 
> Basically the problem is this:
> 
> in poly 8 mode (playing up the keyboard from lowest C) only 3 out 
of eight notes play. As you continue up the keyboard the next three 
notes out of eight sound and so on. 
> 
> Thinking this might be simply dead voices, i played 8 notes on a 
single key that i knew worked (to cycle through the voices) and all 
eight key presses worked okay.
> 
> In poly 4 mode, you get four notes with a sound, four that dont 
(once again going up the keyboard).
> 
> Mono mode doesn't produce any sound at all.
> 
> There is also tonal variation between all the notes that do sound, 
as if the filter EG isn't getting the correct information. The EG 
works fine and does what it should when tested on a note that works.
> 
> On the top panel, when pressing certain switches, the LED's on 
other switches flicker weakly. This has lead me to consider an earth 
problem somewhere, possibly due to a defunct IC.
> 
> Next weekend we intend to get the oscilloscope out and track the 
signals through the machine.
> 
> We remain confident!!!
>  
>   ----- Original Message ----- 
>   From: gil_we 
>   To: kawai_sx210@yahoogroups.com 
>   Sent: Sunday, October 02, 2005 1:07 PM
>   Subject: [kawai_sx210] Re: Can anybody please help???
> 
> 
>   Can you describe the problem again ?
> 
>   As far as I understand the problem is dead tones -
>   which doesn't come up at all when in Poly 8 mode (all keys 
respond 
>   and plays ok) and only exist when in Poly 4 mode, where the first 
4 
>   keys pressed will play and the next 4 won't ?