Yamaha CS80

Mike,

I agree with Kent.  As I told you, when I re-chiped my CS80 I had a few 
problems that were all tiny solder bridges between pads.  I'd spend a 
bunch of time with a lighted magnifier to start.  Do you know which 
board it is?  I had strongly suggested to you that you only re-chip one 
board at a time to help isolate any possible re-work goofs.

Good luck,

 David

kent_spong wrote:
> If I could make a suggestion to you here.
>
> Forget about the IC's being too fast or slightly different to the 
> originals. I think your barking up the wrong tree here.
>
> This sounds to me like a physical problem created by replacing the 
> IC's, and not the IC's themselves. 
>
> When I KSR an 80 I use off the shelve new IC's, the make is of no 
> concern at all. 
>
> If you have used dil sockets for the IC's, check for bent legs, pins 
> soldered together and even orientation. After doing over 60 CS80 
> restorations now I can still screw it up from time to time so don't 
> be offended if I sound like I'm putting your work down. 
>
>
> If you like, send me a detailed list of all the problems your having 
> and I will work through them with you to fix your beautiful synth (I 
> do love CS80's so much).
>
>
>
> --- In yamahacs80@yahoogroups.com, "mborish_2000" <mborish_2000@...> 
> wrote:
> >
> > It might.  Some of the older chips took forever to switch.  I 
> haven't
> > seen a datasheet for the original 4000 series Toshiba IC's. I'm 
> going
> > to do that next.  The new 4000 series chips have much lower 
> internal
> > resistances.   
> > 
> > --- In yamahacs80@yahoogroups.com, "Quazimodo" <noddyspuncture@> 
> wrote:
> > >
> > > Mike I just Googled and read up on it (a bit..)
> > > 
> > > Should you really worry... it looks like it would be in the
> > > *nanosecond* region anyway.... or am I wrong..?
> > > 
> > > Cheers,
> > > TOM
> > > 
> > > 
>