PolySix Repairs

[Goddard, Duncan]

> >   The first thing to look for is bad IC pins or corroded tracks around
> > IC30 and IC31 as well as the resistor SIP R17.  The IC30/31 pair are bus
> > buffers that facilitate the connection between the front panel logic as
> > well as the patch RAM, etc.  Losing any one of these signals will cause
> > strange things to happen, like stuck LEDs........
> BTW, does anybody know why it's always Polysixes with battery damage? I
> mean, there lots of synths with batteries from that time, but I have
> never heard of those problem with any other synth. Is it this certain
> type of battery?<<<<
> 
this is all prompting me to get my poly6 back out of the attic and have
another go..... I replaced many parts, including those mentioned above, and
the thing is now the equivalent of a juno-6 when it should be a juno-60,
i.e. it works from the panel controls but can't remember anything. it's
probably something dead simple, but I'm afraid the track won't take any more
desoldering without falling apart.
I've never seen battery-damage in any other synth, tho' I spent almost 18
months on a juno-106, most of that waiting for parts to come by boat from
japan- wasn't this model built in italy? the thing was an early one and had
the combined cpu/rom chip. I ordered a new cpu and got one with no on-board,
sixty days later. so then I had to wait another sixty days for chip #2 and
then another sixty days for the dco and vca that I could now hear not
working. this all was down to a can of cola; the "synthesizer service
centre" were probably quite right to write it off- I persisted because I
hate seeing things die, and my mate was very grateful.

d. 



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