Archive of the former Yahoo!Groups mailing list: Discussion about the Korg PolySix synthesizer

Greetings to all. My name is Jim and I'm new to this group. First, I
want to thank everyone whose info and replies I have been reading
here in Polysix land. You people are a godsend and are very familiar
with this particular beast and I thank you for all of your ideas for
the repair of my Polysix (Old Crow, you especially!). This really is
the information age at its best! As for me, I am a "munician"- in
other words, I am a musician/technician, and over all gadget freak.
For some reason, over the last few years I have been relentlessly
collecting synthesizers and keyboards, but that's another topic all
together. And now on to my repair problem...
I bought a Polysix off of eBay which is in very good condition except
for a few dings to the wood sides. This unit was non-functional when
it arrived due to the battery corrosion problem. The strange thing is
that the battery didn't leave a puddle of corrosion under it, it just
caused many, many of the via holes and traces covered with dull
grainy appearance. This occurred over at least half of the component
side of the board (the battery still looks fine and works). So, I had
to repair a bunch of traces with jumper wire and also used my
conductive pen (try it!), after which time all of the funtions of the
keyboard now operate with the exception of ONE ANNOYING THING- no
memory funcion. In other words, when I tweak a patch the way I want
it and then store it it vanishes when I change banks and then go back
to it. Also, when I load a tape dump in it accepts it, but does not
appear in memory. I traced this down to a corroded +5 volt supply pin
on IC 32. When I repaired this problem it still wouldn't work. Plus,
when shut off the circuit draws about 3/4 of an Amp from the battery-
enough to kill any back-up battery quickly. When I disconnected the
+5 to the memory chip, the current draw problem goes away. Plus, I
checked IC 25 gate chip, and it works fine. The only thing that can
cause this, in my mind, is a faulty TC5514APL-3 SRAM. DOES ANYONE
KNOW WHERE I CAN GET ONE OF THESE CHIPS? Are there any substitutes?
All you techies out there, please help! Thanks for reading this very
long post. Take care! ~JIM