> From: conorstrachan@...
>
> Worked a treat!
>
> Just got my Polaris.
> Keyboard springs dislodged in transit. That is fine.
> Strangely one of the keys has a missing weight, no where to be seen.
> Output was desoldered in transit that was easy fix.
>
> This one however has turned up with a missing 3372! Two of
> the voices are failing to calibrate. How would you proceed
> With two unworking voices, one of them missing VCF?
>
> Sounds incredible though as a four voice!

When diagnosing a bad voice, the first thing to do is to try swapping chips between it and a working voice. That's the benefit of having socketed chips. If the problem moves to the other voice, then you've found a bad chip that should be replaced. If none of the chips are bad, then you have to go to the next level and start using tools like a scope, and careful reasoning to figure out what's wrong.

The obvious fix for the missing 3372 is a 3372. Unfortunately, they're a bit pricey.

--

Ciao, Paul D. DeRocco
Paul mailto:pderocco@...