Crumar Musical Instruments User Group.

> Hmmm... Now I can't remember - I'll have to hook them up again to be
> sure but I think the one with only one good voice was the one with
> 3328s. The voices that have failed are very specific to the note
> order. If I press one key and keep it held down, then press another,
> etc... I can determine how many voices of the six are working. They
> are always dead in the same order, such as: 
> 
> 1-quiet, 2-working, 3-working, 4-working, 5-quiet, 6-quiet
> 
> or 
> 
> 1-quiet, 2-quiet, 3-quiet, 4-quiet, 5-working, 6-quiet

It would be interesting to see if the faulty voices are all
one or other side when you go split.

> I got a basic oscilloscope expecting to be able to read the output
> from each signal pin of the ICs in each circuit path, assuming that
> one of them would be suspiciously flat-lined - but I haven't found
> anything like that in poking around so far. Everything seems to have
> power and is moving signals along.

I'll see which version schematics I have and suggest a few useful test 
points to measure.

> I'll have to give that a try, although from what I recall, the noise
> was audible. I'll write again as soon as I get them tested again. 

OK.


Steve