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On Mon, 02 Aug 2004 20:21:44 -0000, bkuris <benjamin.kuris@...> wrote:
> One pot, by the gold colored chip is a trim adjustment for the DAC.
> The polaris's CPU uses this to generate CV voltages that are clocked
> into the various sound generating parameters. When the Polaris was
> designed, DACs were expensive so there is just one and that is
> shared. The service manual describes calibrating this, and I've
> done it (I had a bad DAC and built a new one using modern parts) but
> you need a very good meter. I doubt that is your problem.
>
> Another by the power supply (I think) pot is for the "power ok" set
> point. You shouldn't need to touch that either unless you are having
> issues getting your keyboard to reset properly on power cycles.
>
> As for the sliders, the service manual describes how to do a s/w
> calibration of the sliders. You put it in this mode (I don't have
> service manual in front of me), and then just move the sliders
> through their range.
>
> However, it sounds like you have the common problem of
> damage/cracking on the aging ribbon wires that plug into the contol
> panel. Carefully examine them, and if they are cracked they will
> need to be repaired. On my polaris, I cut back to good material and
> used a meter to verify contact.
>
> Also, the resonance control isn't 12bit analog like the others, it
> has only 8 positions (3 digital control lines).
>
> -Ben
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