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
> > >
> > >
>