Re: K5 distorted output from patches using Source-2

Yes I do have a scope I just haven't gotten that far yet. Yesterday I 
rebuilt the keyboard. This synth has a nice action when it's all 
greased up and triggers every note. I found the aftertouch 
adjustments and got it more sensitive than the key bending tipping 
over the stand mode it was originally set for. The aftertouch strip 
has a few spots that are less sensitive but hey it's a beast....

If it will help I can post the DAC's datasheet here in the files 
section so you can see what weird output configurations it can have. 
Either current or voltage outputs can be used. There isn't any pot 
for the offset zero. Also it seems like Kawai doesn't use much of the 
gain that's available. Maybe that's why it's so noisy.

The patches sound like they should if I turn the balance so S2 is off 
(-31). Except of course they're thin and lifeless without the other 
voice mixed in. I saved a bank that way so I could check out the 
keyboard. I can see where some of the noise comes from. The high 
frequency response goes way out there. Most of these 80's and 90's 
synths have low pass filters. This thing sounds wide open on top end! 
Probably so you can hear the 128 harmonics in all their glory.

Hopefully I won't be beat when I get home from work so I can play 
around with this some more. Still haven't heard from Kawai yet about 
the schematics. Also they always have me sign their non-disclosure 
form so I'm leery about openly posting them in the group. Of course 
helpful individuals are a different story. Right???

Fran

--- In [email protected], James Bong <jamesbong@...> wrote:
>
> You wouldn't happen to have an oscilloscope to verify
> that the output of this chip is actual problem, do
> you? 
> 
> If you do get the schematics, could you possibly get
> them scanned to share with the rest of us?
> 
> James
> 
> --- narfman96 <narfman96@...> wrote:
> 
> > I resoldered everything involved in this part of the
> > circuit. There 
> > is a feedback resistor on the DAC for the audio
> > output. This measures 
> > 6.8k same as the working one. Maybe tonight I'll try
> > lowering this 
> > value to see if the gain decreases.
> > 
> > I'm not having much luck finding a PCM55HP DAC.
> > Digikey lists it for 
> > $38.50 with a long, long lead time... Crap! Anyone
> > know of a source?
> > 
> > Hopefully Kawai gets back to me today about the
> > schematic.
> > 
> > Thanks, Fran
> > 
> > --- In [email protected], James Bong
> > <jamesbong@> wrote:
> > >
> > > Does this chip have a bias circuit to set the
> > min/max
> > > output voltage scale? It could be something as
> > simple
> > > as a cold solder joint finally loosing contact and
> > > changing the bias. I'd check/re-solder the solder
> > > joints to everything connected to the chip, and
> > the
> > > chip it's self.
> > > 
> > > James
> > 
> >
>



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