Odyssey filter repair

[Matt Haines]

I mentioned the Odyssey that was given to me before (perhaps it was on AH).
It's a wreck, sliders sheared off and no audio present, etc etc. One of the
things wrong is, the filter seems to be dead. Pin 10 of the filter module
is the audio output, according to the schematic. When I crank resonance up
so that it should be self-oscillating, I get nothing on the scope from pin
10 (or any of the others). In case the slider was busted, I clipped a wire
around the slider in the appropriate way to simulate 'full on', and still
nothing.

Two questions:

1) did I do something wrong to check this?

2) I figure I'd better start replacing components on the module. What sorts
of things are likely to die first? I'd of course rather not have to pull
everything.

If anyone has any tips on how to fix this, I'd be grateful.

BTW, VCO 2 is also dead (I *said* it was a wreck!). On the scope I get a
pulse every 10 or 15 seconds. I did the same routing around pots and it
doesn't change. What sorts of things go wrong, and how do I go about
finding them? Thanks.


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