The battery backup protects also includes trim on VCAs and touch
response of the keys. That info is a pain to recalibrate.

You want to replace the caps labeled Polyprop. that hang off of the
sample/hold latches (ZX01 and ZX02).

The Polaris Mother board is quite large and similar in complexity to
other 80's computers-- the 2nd time I replaced the caps, rather then
remove the board I just added extra solder to the leads of the
existing caps and used reflowed them out carefully. Afterwards I
used a solder sucker to the clean the holes and then carefully
soldered in new caps (with a bit of extra lead to ensure a good
joint). The solder will wick down into the holes.

If you want you can isolate the offending voice(s) to narrow down the
replacement to just a few caps (use voice disable controls) but
sooner or later all will go.

-Ben



--- In chromapolaris@yahoogroups.com, "tkrotchko" <tkrotchko@h...>
wrote:

>
> Ah. Now I see what you're talking about. Are these caps referred to
> as CX03-X35 and CX02-X27? The service manual refers to them as

mylar,

> although it shows quantity 25 and 52 of each type.
>
> You also say "be careful not to remove the battery". Can you

explain

> why? I realize the memory will be lost, but why does it matter?
>
> Also, is there any pictures of the mainboard out there to get an

idea

> of what I'm up against?
>
> The symptoms that I'm seeing right now is that if I just play right
> up the scale, I'll see every few notes just out of tune. And its

the

> same note every time. Like if I play up the scale, "C" will be out

of

> tune.
>
> --Tom
>
> --- In chromapolaris@yahoogroups.com, "bkuris" <benjamin.kuris@h...>
> wrote:
>
> [...]
>
> > The fix was to replace the S/H capacitors which are the 4 orange

caps

> > on either side of the TL084 opamps near the CEM voice chip.
> > Replacement caps were panasonic polypropylene caps from
> > www.digikey.com. I didn't want to take out the motherboard so it
>