Vintage Synth Repair

I posted the DX7II power supply component view and parts listing in 
the files section. There are several boards listed for the U.S. 
Canada and Europe. I don't have the schematics. I didn't include 
Japan.

The caps can leak but like you say they usually swell. I have digital 
pictures of this. C1, C11, C23, and C24 are the worst for leakage in 
the U.S. model. If the whole supply is dead check the bridge 
rectifier first. Then the transformer.

HTH, Fran 

--- In vintagesynthrepair@yahoogroups.com, "synapticdistortion" 
<atonal@...> wrote:
>
> --- In vintagesynthrepair@yahoogroups.com, "jim" <leman@> wrote:
> >
> > As this can be usefull to other guys, I posted the DX7 schem in 
the
> > file section.
> > enjoy !
> 
> 
> Thanks for posting that, Jean-marie.  Unfortunately, mine looks to 
be
> a bit different from those schematics.  Perhaps they are only
> representative of the original DX7, not the FD-II model.  The power
> supply from this one is all on one circuit board, and there is only
> one fuse.  
> 
> One thing that I've noticed is that there is a hard, tan-colored
> substance at the bottom of several of the caps.  I can't tell if 
it's
> leakage, or some sort of thermal material that was placed there 
during
> manufacturing.  The caps in question otherwise look fine (no bulges 
or
> splitting).
>