[sdiy] sci profit 600 troubles

[Tom Wiltshire]

I don't think it's a bad 3340, since you said you'd swapped other parts  
into this position and they acted the same way. The obvious next  
question is "Does the chip from the bad position cal up ok when  
inserted in another voice?" If so, that pretty much rules out a fault  
in the 3340. Hope so, for your sake - 3340s aren't going to be cheap.
Assuming it's ok, you're looking for dead components around the 3340 in  
the bad position. It could be a dry joint, or perhaps a dead capacitor  
- they'd be more likely to die of old age than a resistor.

Hope this helps!

Tom

On 14 Feb 2007, at 19:16, mike schmidt wrote:

> I have a profit 600 on my bench and am having trouble calibrating  
> vco4b, all of the other 3340's
> cal up just fine. Ive switched out other osc chips from other voices  
> and they wont cal up either in this position,
> I am also getting all of my waveforms out of the 3340, and its freq.  
> changes, it just wont scale corectly, also the pot is sweeping its  
> range correctly.
>
> anyone have any
> ideas?
>
> thanks in advance
> mike schmidt
>
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