PolySix Repairs

[Christian Hofmann]

On Fri, 8 Sep 2000 19:32:00 -0400 (EDT)
The Old Crow <oldcrow at oldcrows.net> wrote:

>   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.

Yes. And with my P6 I had even to replace one of those ICs (ordinary
74LS08s they are, IIRC). Still looked perfect, but functionally damaged
anyway. Dead cheap parts, but at a very important location in the P6.
Might be necessary to replace those anyhow, to fix the crumbly board
traces underneath.

As a side note, despite the synth acting pretty brain dead, I was even
able to save the patch memory to tape before the operation... :-)



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?

regards
Christian