On 7/10/2015 3:45 PM, 'Paul D. DeRocco' pderocco@...
[chromapolaris] wrote:

>
> > From: GMM
> >
> > Next plan is to dig into the service manual description of the Timer
> > Interface Serial I/O section, particularly as it relates to
> > the tuning process.
>
> If the working channels end up in tune, then the timer circuitry is
> probably fine.
>
> > I'm starting to think that the voices are working correctly, but some
> > are receiving bad information. We'll see.
>
> The only thing outside the channels that isn't common to the channels are
> the various decoded lines that enable the S&H switches and that clock the
> data latches. Have you tried replacing the chips that generate those lines
> (Z31, Z32, Z60, Z61, Z62)?
>

The S/H control parts (60, 61, 62) have already been changed, with no
effect.
I have 31 & 32 on order (along with a few other things) -- will see what
happens when they arrive,
Thanks.

Now, back to work on the distressed Rhodes Chroma (left exposed to sea
air for about ten years -- didn't think such corrosion was possible).
~GMM

>
> --
>
> Ciao, Paul D. DeRocco
> Paul mailto:pderocco@...
>
>