Hi,
i´m sure that you will not find easy a 5114 RAM (if, then to a horrible
price), just take the 2114, it´s the same (1K∗4)
The 5114 was produced by Philips, the 2114 is manufactured by National
Semiconductor or Mitsubishi.
Stef
springpan wrote:
>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
>
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