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

[Nate Reeves]

is the rectifier the coil inductor looking box?
looks like the spx90 and spx90 II have the the same power supply units  
so i have spare parts!

sweet!

i am taking voltage readings off the board....

on connector CN4 it looks like 2 pins, 2nd & 3rd from DG (digital  
ground) are not giving off the logic +5V for the digital  
stuff ....looks like that might be an issue

on connector CN4 i am getting readings too low on the -18V side and  
too high on the +18V side (11V and 29V respectively)

admittedly I am a bit confused on the connector.....

pin1 PC
pin2 PE
pin3 +18V
pin4  +18V
pin5 GRD
pin6 GRD
pin7 -18V
pin8 -18V

is that correct?

what is PC & PE?

i put ground probe between pins 5 & 6 and measured around to get -11V  
on pins 7 &8 and 29V on pins 3 &4

i will double check these values in a bit B^p

cheers,

nate


On Oct 8, 2008, at 10:53 AM, Roy J. Tellason wrote:

> On Wednesday 08 October 2008 10:10, Nate Reeves wrote:
>> hey all, does anyone have the schematics for the above unit?
>>
>> i am sure i can call yamaha and buy it but i rather save $$$ if
>> possible...
>
> http://mysite.verizon.net/rtellason/manuals.html    :-)
>
>> i plugged this thing in and it took about 5 secs for a electrolytic
>> cap to smoke on the p/s board....
>>
>> should i replace all caps on the p/s board or just the smoking gun?  
>> B^p
>
> Find out why it smoked.  You're probably looking at a shorted  
> rectifier,
> maybe?
>
> -- 
> Member of the toughest, meanest, deadliest, most unrelenting -- and
> ablest -- form of life in this section of space,  a critter that can
> be killed but can't be tamed.  --Robert A. Heinlein, "The Puppet  
> Masters"
> -
> Information is more dangerous than cannon to a society ruled by  
> lies. --James
> M Dakin
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy