[sdiy] yamaha spx-90 blown p/s caps

[GRAHAM ATKINS]

Nate,

Thats far too complicated for a linear supply !. The Xformer would be  
much
bigger. Those are inductors. Yes the switching regulator does probably  
run
fairly hot. Often the capacitors break down on such devices. Do you  
have a
meter that can read capacitance ?. Certainly remove and replace the  
damaged
one but I would carefully remove a few more, the biggest first, and  
check them.
They may be badly out of spec. replace any suspect ones.....look for  
signs of
heating and/or bulging at the ends. If you do have to source any  
replacements
(Not in your spare) go for the higher temp 105 Deg caps rather than  
the 85 Deg
equivalents. Used frequently in VCRs etc, usually the caps fail.

Now wheres that meter......

Graham
On Oct 8, 2008, at 17:43, Nate Reeves wrote:

> i think it is a linear supply but here is a pic
>
> http://picasaweb.google.com/natere2ster/YamahaSpx90Spx90II#
>
> i did notice that the heat sinked voltage regulator (?) was VERY hot  
> to the touch, with the unit being one for only 10 minutes
>
> my hope is that between the 2 boards i can make one fully  
> functional!  lol
>
> cheers,
>
> nate