[sdiy] Kurzweil K2000 Query continued

[DTK]

A bit more information on this:

First, for those who suggested changing the batteries:  There are actually 
no batteries in this machine.  The owner uses the synth as a controller, and 
for stock sounds.  According to him, he removed the batteries long ago.

The volume loss has continued, but there is still no noticeable change in 
sound quality.  I'm thinking that maybe something is going out in the final 
output stage.  Anyone have any suggestions?  I'll be googling for schematics 
momentarily, but if you know where I can get them, or the service manual, 
feel free to chime in.

Thanks



> I'm taking a look at a K2000 for a friend.  It's exhibiting a strange
> problem... at least, I think it's a problem.  If I hadn't been there when 
> it
> happened, I might have thought it was nothing.
>
> We were playing, and suddenly the K2000 lost volume...  It wasn't a 
> dramatic
> loss, the patch was still audible, but there was *definitely* a loss in
> volume.  The patch wasn't changed or edited, mixer settings weren't 
> changed,
> etc.  It just got quieter all of a sudden.
>
> At first we thought it might be some sort of mechanical failure in the
> output jack... A solder joint on the way out, or a worn out center
> connection.  However, that doesn't seem to be the case.  The problem
> persists on the L, R, and Headphone jacks, and on different patches as 
> well.
>
> I'm a bit puzzled by this one, frankly.  There's no difference in the 
> audio
> quality, which leads me to think that the output circuitry is ok.  Anyone
> have any thoughts?  Suggestions?
>
> As a side note, the battery in this K2000 is DEAD... 0.0v according to the
> warning when we power it up.  I don't think that would have anything to do
> with the problem, but please correct me if I'm wrong!
>
> Thanks for any insights you may have...
>